Enzyme-Induced Carbonate Precipitation (Eicp) Combined with Lignin to Solidify Silt in the Yellow River Flood Area

2022 ◽  
Author(s):  
Jianwei Zhang ◽  
xiaoju Wang ◽  
Lei Shi ◽  
Yue Yin
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Carbonate Precipitation ◽  
River Flood

scholarly journals Experimental Study of EICP Combined with Organic Materials for Silt Improvement in the Yellow River Flood Area

2020 ◽  
Vol 10 (21) ◽  
pp. 7678
Author(s):  
Hua Yuan ◽  
Guanzhou Ren ◽  
Kang Liu ◽  
Wei Zheng ◽  
Zhiliang Zhao
Keyword(s):  
Calcium Carbonate ◽  
Organic Materials ◽  
Yellow River ◽  
Optimum Concentration ◽  
The Yellow River ◽  
Brown Sugar ◽  
Nucleation Sites ◽  
Carbonate Deposition ◽  
River Flood ◽  
Calcium Carbonate Deposition

Enzyme-induced carbonate precipitation (EICP) is an emerging biogeotechnical technique that uses free urease to improve soil. Despite its advantages of eliminating complex microbial cultures and reducing reaction byproducts, its efficiency is considered lower than that of microbial induced calcite precipitation (MICP) due to the lack of nucleation sites that induce calcium carbonate deposition. To enhance the strengthening efficiency of EICP for fine-grained soils, an improved EICP method that involves adding an appropriate mass concentration of organic materials (skim milk powder, glutinous rice powder, and brown sugar) into urease solution was proposed and applied to reinforce silt in the Yellow River flood area of China. The preferred concentration and ratio of cementation solution and the optimum concentration of each of the organic materials were determined. Then, the reinforcement effect of the improved EICP at the optimum concentration was compared with the control group, and the reinforcement mechanism for this method was discussed. The results show that after the organic material inclusions, soil strength can be enhanced by 33% compared with EICP-treated soil and is nearly four times higher than that of untreated soil. The superiority of this method over traditional EICP and MICP mainly stems from its ability to provide templates and nucleation sites for calcium carbonate deposition and to improve the size, morphology, and structure of calcium carbonate crystals.

Test Study of Pore Water Pressure during Dynamic Compaction at the Subgrade of Highway in the Yellow River Flood Area

2011 ◽  
Vol 374-377 ◽  
pp. 436-439
Author(s):  
Kai Yao ◽  
Zhan Yong Yao ◽  
Xiu Guang Song ◽  
Qing Sen Shang
Keyword(s):  
Pore Water ◽  
Pore Water Pressure ◽  
Yellow River ◽  
Water Pressure ◽  
Dynamic Compaction ◽  
The Yellow River ◽  
Silty Clay ◽  
Excess Pore Water Pressure ◽  
River Flood ◽  
Excess Pore

The Yellow River flood area mainly consisted of silt and silty clay. Water level observing holes and pore water pressure gauges were embedded in the test section. The observation results showed that: The pore water pressure of 3m and 5m grew slowly at the beginning. With the increase of ramming strike and the total ramming strike energy, the fourth hit pore water pressure mutated and then grew slowly. The pore water pressure of 7m and 9m grew slowly all the time. Because of the well point dewatering, the excess pore water pressure dissipated very soon. 70~75% of the excess pore water pressure of the first pass dissipated 3 hours after ramming strike, then the excess pore water pressure dissipated slowly. The excess pore water pressure of 3m and 5m grew significantly, so the effective reinforcing depth of dynamic compaction was 5m.

Spatiotemporal Variation of Wind Erosion Climatic Factor in Shandong Province

2013 ◽  
Vol 295-298 ◽  
pp. 919-923
Author(s):  
Shou Gang Tian ◽  
Liang Ma
Keyword(s):  
Wind Erosion ◽  
Yellow River ◽  
Flood Plain ◽  
Climatic Factor ◽  
Shandong Province ◽  
Downward Trend ◽  
The Yellow River ◽  
River Flood ◽  
C Value ◽  
Factor C

With Mann-Kendall non-parametric test and spatial interpolation methods, the research has explored the spatial and temporal characteristics of changes of wind erosion climatic factor C within 58 years in Shandong province. The annual average C value of the province is 163.57 with the peak value occurred both in Yantai, Weihai cities and the central area. The Yellow River flood plain, which is the most serious wind erosion district, only lies between 50 ~200. The average C value has shown a significant downward trend in the entire province for 58 years, and the peak occurred in 1962 and valley value occurred in 1990. The C value has shown a downward trend in most area of the province, among which the decrease of areas centered on Ji’ning is the greatest and reach -7/a. On the Yellow River flood plain, the C value also shows a regional difference declining trend.

Numerical Analysis of Natural Foundation Settlement under Different Subgrade Height in the Yellow River Flood Area

2014 ◽  
Vol 716-717 ◽  
pp. 338-341
Author(s):  
Jie Geng ◽  
Xiao Gang Ren ◽  
Xiao Guang Wang ◽  
Zhuang Jin
Keyword(s):  
Numerical Analysis ◽  
Yellow River ◽  
The Yellow River ◽  
Value Of Time ◽  
Foundation Settlement ◽  
Groundwater Levels ◽  
River Flood ◽  
Natural Foundation ◽  
The Impact ◽  
The Relationship

Foundation subsidence is an important factor affecting the life of the highway, as well as one of the important evaluation indicators of the foundation disposal measures. In this paper, by selecting typical foundations of Jile express highway, FLAC3D was used to simulate the natural foundation settlement under different subgrade height considering the impact of groundwater levels in the Yellow River flood area. The relationship between the time T (Month) from subgrade construction completed to stabilization and the subgrade height H was found as: T=0.36H2-1.63H+33.47, and the appropriate value of time was got to be placed under different circumstances.

A MAR to address the water with high content of suspended solid with a case study in the Yellow River flood plain, China

2017 ◽  
Vol 182 ◽  
pp. 165-175 ◽  
Author(s):  
Qian Rong ◽  
Weiping Wang ◽  
Shisong Qu ◽  
Jinchao Li ◽  
Fengli Li ◽  
...  
Keyword(s):  
Yellow River ◽  
Flood Plain ◽  
Suspended Solid ◽  
The Yellow River ◽  
River Flood

Study on Discharge and Diffusion of Raised Dust during Subgrade Construction in the Yellow River Flood Area

2011 ◽  
Vol 374-377 ◽  
pp. 759-763
Author(s):  
Zhan Yong Yao ◽  
Kai Yao ◽  
Pei Zhi Zhuang ◽  
Kai Zhang
Keyword(s):  
Point Source ◽  
Line Source ◽  
Yellow River ◽  
The Yellow River ◽  
Area Source ◽  
Source Line ◽  
River Flood ◽  
Loading And Unloading ◽  
And Diffusion ◽  
Source Emission

The construction process of subgrade construction was divided into several operating units：oil material loading and unloading, vehicle transportation and wind erosion dust. For each operational unit during each stage of subgrade construction, different Gaussian diffusion models were chosen respectively according to the transmission and diffusion of raised dust from different source (point source, line source and area source). Finally, based on one contract section on a freeway in the Yellow River flood area, the concentration distribution was calculated using atmospheric estimation software in different pattern of point source, line source and area source. It was shown that with the increasing of distance, point source and area source emission increased to the maximum value and then decreased to the stable value, while line source emission presented a distribution pattern which changed decreasingly.

GEOMORPHOLOGICAL CHARACTERISTICS OF A TRANSECT FROM THE YELLOW RIVER TO THE IRON PAGODA IN KAIFENG CITY, CHINA

2018 ◽  
Vol 14 (1) ◽  
pp. 245-254 ◽  
Author(s):  
Yang LI ◽  
◽  
Zhixiang XIE ◽  
Fen QIN ◽  
Yaochen QIN ◽  
...  
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Kaifeng City
Sign in / Sign up

Export Citation Format

Share Document