scholarly journals Study on the Stabilization Mechanisms of Clayey Slope Surfaces Treated by Spraying with a New Soil Additive

2019 ◽  
Vol 9 (6) ◽  
pp. 1245 ◽  
Author(s):  
Cuiying Zhou ◽  
Shanshan Zhao ◽  
Wei Huang ◽  
Dexian Li ◽  
Zhen Liu
Keyword(s):  
Organic Polymer ◽  
Molecular Volume ◽  
Water Stability ◽  
Infiltration Depth ◽  
Infiltration Process ◽  
Soil Particles ◽  
Soil Stabilizer ◽  
Polymer Stabilizer ◽  
Infiltration Tests ◽  
Clayey Slope

The topsoil of a clayey slope is easily washed off by rain due to its loose structure. To protect the slope surface, in recent years, several types of non-traditional soil additives have been used by means of mixing with soil. In this work, a new organic polymer soil stabilizer, named aqua-dispersing-nano-binder (ADNB), was sprayed on the soil surface to stabilize the topsoil of a clayey slope. To understand the interaction between the polymer and soil particles during the infiltration process as well as the stabilization mechanism, infiltration tests, water stability tests and scanning electron microscopy (SEM) analyses were performed with different polymer contents. The infiltration tests showed that the infiltration rate of the polymer stabilizer in the soil was slower than that of water due to its characteristics of easy adhesion to soil particles, poor fluidity and large molecular volume. The maximum effective infiltration depth was achieved in the specimen treated with 2% ADNB, and the minimum was achieved in the specimen treated with 5% ADNB. The water stability of the soil increased with the content of the soil stabilizer in the soil aggregates with diameters of either 5–10 mm or 10–20 mm. The SEM analysis showed that the quantity of polymer decreased with infiltration depth; a polymer membrane was formed on the surface of the topsoil and chains were formed inside. The amelioration of the soil water stability may have been due to the bonding between soil particles and polymers generated after evaporation of water in the emulsion. The polymer stabilizer could be applied to improve the erosion resistance of the slope topsoil and reduce soil loss.

scholarly journals Effect of Colluvial Soil Slope Fracture’s Anisotropy Characteristics on Rainwater Infiltration Process

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Ling Zeng ◽  
Jie Liu ◽  
Jun-hui Zhang ◽  
Han-bing Bian ◽  
Wei-hua Lu
Keyword(s):  
Pore Water ◽  
Permeability Coefficient ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Positive Pressure ◽  
Saturated Zone ◽  
Infiltration Depth ◽  
Infiltration Process ◽  
Fracture Angle ◽  
Rainwater Infiltration

The SEEP/W module of finite element software GEO-slope is used to analyze the effects of fracture depth, permeability coefficient ratio, fracture angle, and fracture number on the rainwater infiltration process. Moreover, the effect of fracture seepage anisotropy on slope stability is discussed combining with unsaturated seepage theory. The results show that the pore water pressure in the fracture increases rapidly with the rainfall until it changes from negative pressure to positive pressure. The greater the fracture depth is, the greater the pore water pressure in the fracture is, and the greater the infiltration depth at the time of rainfall stopping is. When the permeability coefficient is greater than the rainfall intensity, the permeability coefficient ratio has a great influence on the infiltration process of rainwater. The smaller the fracture angle is, the greater the maximum pore water pressure is in the fracture depth range, and the greater the depth of the positive pore water pressure is. However, with the increase of fracture angle, the infiltration depth decreases, and the range of the surface saturation area of slope increases obviously. With the increase of fracture density, the saturated positive pressure region is connected to each other in the slope. The influence range and the degree of the rainwater on the seepage field are larger and larger. There is a power relation between the saturation area and the fracture number, and also the concentration distribution of long fractures directly forms the large-connected saturated zone and raises groundwater. The range of the saturated zone and variation law of the pore water pressure under fracture seepage are obtained, which provide a reference for the parameter partition assignment of slope stability analysis under fracture seepage.

Study on Ionic Soil Stabilizer Reinforcing Red Clay of Wuhan

2011 ◽  
Vol 261-263 ◽  
pp. 1129-1133
Author(s):  
Xue Song Lu ◽  
Wei Xiang
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Focal Point ◽  
Linear Shrinkage ◽  
Development Economic ◽  
Red Clay ◽  
Soil Particles ◽  
Soil Stabilizer ◽  
Compressive Strength Test ◽  
Free Swell

With fast research and development, economic and effectual materials have been the focal point of all over the world all the time. This experiment studies and uses a new kind of economic and suitable Ionic Soil Stabilizer (ISS for short). Based on the red clay of Wuhan reinforced by Ionic Soil Stabilizer, the red clay is treated by different matches of ISS and water at first, then is tested in the unconfined compressive strength test, shrinkage test, free swell test, and spectrum test. The results show that unconfined compressive strength increases, and the linear shrinkage, shrinkage limit and free swell decrease after mixing the ISS into the red clay. In addition, spectrum tests show that after the red clay is treated by ISS, soil particles on the surface of the C elements had changed markedly, from scratch, confirmed the ISS elements combined with the role of soil particles.

scholarly journals A Cross-Linked Polymer Soil Stabilizer for Hillslope Conservation on the Loess Plateau

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaochao Zhang ◽  
Yujian Zhong ◽  
Xiangjun Pei ◽  
Yuying Duan
Keyword(s):  
Compressive Strength ◽  
Functional Groups ◽  
Loess Plateau ◽  
Unconfined Compressive Strength ◽  
Germination Rate ◽  
Water Retention Capacity ◽  
Water Stability ◽  
The Loess Plateau ◽  
Slope Surface ◽  
Soil Stabilizer

The soil of the Loess Plateau is highly susceptible to erosion due to its distinct loess structure with poor water stability and disintegrates easily. Previous research has focused on improving soil strength without considering stability and ecological performance. Comprehensive improvements may be achieved by cross-linked polymers (CLPs), but their effect on loess structure remains unclear. In the present study, we investigate CLPs as a new organic soil stabilizer to improve soil aggregate stability. To determine the effect of CLPs on the stabilization of loess, a series of indoor tests was conducted to assess unconfined compressive strength, water stability, soil-water characteristics, and plant height. The stabilization mechanism was analyzed by comparing the microstructure, mineral composition, and features of functional groups of loess before and after treatment. The results showed that, compared with untreated loess, the unconfined compressive strength and anti-disintegration property of treated loess were significantly increased. The water retention capacity was improved, and the germination rate and growth of plants were promoted. Microscopic analysis showed that the use of CLPs did form new minerals in the loess or change the functional groups, rather, CLPs improved the microstructure, reduced the total volume of pores, and increased the degree of soil compaction. Field tests showed that the erosion of loess hillsides was effectively controlled by CLPs. Under the same erosive conditions, the slope surface treated with CLPs was more intact than the untreated slope surface. Our findings provide new strategies regarding the application of CLPs as soil stabilizers to control loess erosion and promote vegetation restoration.

scholarly journals The Effect of Polymer-Fiber Stabilization on the Unconfined Compressive Strength and Shear Strength of Sand

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Jin Liu ◽  
Qiao Feng ◽  
Yong Wang ◽  
Yuxia Bai ◽  
Jihong Wei ◽  
...  
Keyword(s):  
Unconfined Compressive Strength ◽  
Direct Shear Test ◽  
Shear Test ◽  
Polypropylene Fiber ◽  
Organic Polymer ◽  
Test Results ◽  
Polymer Fiber ◽  
Compressive Test ◽  
Soil Stabilizer ◽  
Scanning Electron

The mixed soil stabilizer of polyurethane organic polymer and polypropylene fiber was used to reinforce sand. The unconfined compressive test and direct shear test were carried out to evaluate the effects of polymer-fiber reinforced sand. The different contents of polymer and fiber were selected for the tests. The test results indicated that polymer-fiber mixture can improve strongly the strength of sand. The presence of polyurethane organic polymer enhances sand structural stability and the best composition of polymer and fiber was 4% and 0.2–0.3% of dry sand, respectively. Based on the test results and images of scanning electron microscope (SEM), the reinforcement mechanism was analyzed. The research results can be considered as the reference for sand reinforced engineering.

Experimental Study on the Weathered Red Sandstone Soil Road Performance Stabilized with EN-1 Soil Stabilizer

2011 ◽  
Vol 255-260 ◽  
pp. 3190-3194
Author(s):  
Jun Shuai Huo ◽  
Yi Jun Geng ◽  
Zhi Qiang Yu
Keyword(s):  
Local Environment ◽  
Engineering Properties ◽  
Water Stability ◽  
Construction Costs ◽  
Red Sandstone ◽  
The Road ◽  
Soil Stabilizer ◽  
Performance Indexes ◽  
Road Performance ◽  
On The Road

Weathered red sandstone soil has weak water stability, unsatisfactory mechanical and poor engineering properties, which limits its utilization. When the proposing expressway through the soil, a large number of abandoned would be generated, which would burden construction costs and bring about many adverse effects to the local environment. To turn waste into treasure, the improving experiment with EN-1 soil stabilizer was conducted. Through the unconfined compressive strength test, the optimal mixing ratio of EN-1 soil stabilizer was identified as 0.014%. Series of tests on the road performance indexes were carried out under the condition of the optimal ratio of EN-1. The test results showed that 28d strength of the improved soil achieved 2.98MPa, 7d water stability coefficient achieved 0.75, the improved soil possessed good engineering properties, which can meet the requirements of expressway pavement materials.

scholarly journals Optimization of Ionic Soil Stabilizer Dilution and Understanding the Mechanism in Red Clay Treatment

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xuesong Lu ◽  
Jin Luo ◽  
Meinan Wan
Keyword(s):  
Experimental Tests ◽  
Uniaxial Pressure ◽  
Water Mixture ◽  
Red Clay ◽  
Soil Particles ◽  
Soil Stabilizer ◽  
Pressure Test ◽  
Clay Layers ◽  
Potential Test ◽  
Clay Treatment

Due to the insufficient understanding of the mechanism for soil strengthening by using Ionic Soil Stabilizer (ISS), the application of ISS in soil treatment is limited. In this paper, red clay samples were treated by using ISS and the effects were examined by the Atterberg test and uniaxial pressure test. In order to understand the mechanism, ISS dilution-based seepage test and ξ-potential test have been carried out. The results show that the ISS-Water mixture of 1 : 200 was the most effective ratio to reduce the plasticity index. The measurements indicate the thickness of the pair-electricity layer of adjacent clay layers and the repulsion force among soil particles is reduced, which in turn enhances the attraction force of the clay layers. This process strengthens the connection among the soil particles and thus increases the strength of the soil as detected by the experimental tests.

Numerical Simulation of Heat and Mass Transfer of the Infiltration in Liquid Infiltration Extrusion Process

2006 ◽  
Vol 532-533 ◽  
pp. 953-956
Author(s):  
Li Zheng Su ◽  
Le Hua Qi ◽  
Ji Ming Zhou ◽  
Yu Shan Wang ◽  
Fang Yang
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Transient Flow ◽  
Volume Fraction ◽  
Extrusion Process ◽  
Infiltration Depth ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Liquid Infiltration ◽  
Simulation Results

The pressure infiltration process of porous preforms by molten metals was investigated numerically in this paper. The finite element model of heat and mass transfer of the infiltration in liquid infiltration extrusion process was founded by the introduction of a new continuum model of fluid in porous medium and a distribution resistance concept. The proposed model can describe the transient flow behavior of semisolid materials qualitatively. Numerical simulations were developed in particular for non-isothermal infiltrations which take into account the thermal aspects (the mould, the fibres and the metal are initially preheated at different temperatures). The temperature distribution, infiltration front and infiltration depth in the infiltration area were gained by the simulation of ANSYS／FLOTRAN code. It is shown that the fiber volume fraction and initial temperature have a strong effect on the infiltration process. The simulation results of axisymmetric infiltration have a good agreement with their experimental ones. In addition, the infiltration time was predicted to get the effective infiltration depth based on the simulation results.

Research on the stabilization treatment of clay slope topsoil by organic polymer soil stabilizer

2011 ◽  
Vol 117 (1-2) ◽  
pp. 114-120 ◽  
Author(s):  
Jin Liu ◽  
Bin Shi ◽  
Hongtao Jiang ◽  
He Huang ◽  
Gonghui Wang ◽  
...  
Keyword(s):  
Organic Polymer ◽  
Stabilization Treatment ◽  
Soil Stabilizer

scholarly journals Experimental Study on Mechanics and Water Stability of High Liquid Limit Soil Stabilized by Compound Stabilizer: A Sustainable Construction Perspective

2021 ◽  
Vol 13 (10) ◽  
pp. 5681
Author(s):  
You Wang ◽  
Hongdong Zhang ◽  
Zhuangzhuang Zhang
Keyword(s):  
Fly Ash ◽  
Liquid Limit ◽  
Inorganic Materials ◽  
Sustainable Construction ◽  
Water Stability ◽  
Soil Stabilizer ◽  
Orthogonal Experiments ◽  
Stabilized Soil ◽  
Diffraction Patterns ◽  
Strength And Stiffness

Sustainable highway construction and operation are threatened by high-liquid-limit soil with low strength and poor water stability in Dongting Lake areas. In order to obtain a soil stabilizer that can effectively improve its strength and water stability, first the author selected inorganic materials (cement, quicklime and fly ash) and sulfonated oil (SO) as the main components of the composite soil stabilizer. Then, a series of single admixture tests were carried out to explore the strength and water stability mechanism of single admixture stabilized soil. Finally, a series of orthogonal experiments and cost analyses were carried out to obtain the formula of the composite stabilizer. According to the results of single doping, inorganic materials can significantly enhance the strength and stiffness of high-liquid-limit soil. The content of SO has a strong correlation with the water stability of high-liquid-limit soil. On a microscopic scale, X-ray diffraction patterns and scanning electron microscopy images explained this law. According to the orthogonal results, the formula of the composite soil stabilizer is: cement 4.5%, quicklime 1.5%, fly ash 2.5%, and SO 0.2%. This paper provides a method to improve high-liquid-limit soil, which is beneficial to sustainable construction and operation of the highway.

Analysis of Durability Performance of Ionic Soil Stabilizer Improving Soil

2015 ◽  
Vol 667 ◽  
pp. 335-340
Author(s):  
Yu Jie Wang ◽  
Wen Yan Lin ◽  
Yong Sheng Huang ◽  
Xin Qiu ◽  
Jin Hong Wu
Keyword(s):  
Tensile Strength ◽  
Organic Matter Content ◽  
Water Soluble ◽  
Size Analysis ◽  
Physical Parameters ◽  
Freezing And Thawing ◽  
Soil Particles ◽  
Soil Stabilizer ◽  
Shrinkage Property ◽  
Typical Soil

In order to study the pavement performance of the soil that improved by ionic liquid soil stabilizer, the red-brown clay was concerned as the typical soil, mixed with the ionic soil stabilizer, the ordinary Portland cement and the hydrated lime, was tested to characterize its durability. The engineering classification of the typical soil was determined and the physical parameters of the ionic soil stabilizer was obtained, according to tests of the particle size analysis, crucial water content coefficient, organic matter content, PH, conductivity, plasma emission spectra, etc. In addition, the tensile strength, durability and shrinkage property were analyzed by split tests, freezing and thawing tests, fatigue tests and shrinkage tests. As a result, the typical soil was a kind of low liquid-limit clay, denoted by CL. The ionic soil stabilizer was a water soluble, high conductivity, strongly acidic sulfonated oleoresin. The ion exchange reaction between the soil and the ionic soil stabilizer begun after treating by the ionic soil stabilizer, and then the role of soil particles became stronger. Furthermore, the void between soil particles was decreased, the structure became closer, and then the tensile strength, durability and shrinkage property were improved. As mentioned above, the research provided theoretical foundation and practical support for using the ionic soil stabilizer in China's highway construction.

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