scholarly journals Optimization and Mechanical Characteristics of Spatial Arc Antislide Pile

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
You-Sheng Deng ◽  
Cheng-Pu Peng ◽  
Jun-Cong Liu ◽  
Ling-Tao Li ◽  
Yun-Bo Fu
Keyword(s):  
Stress State ◽  
Mechanical Characteristics ◽  
Earth Pressure ◽  
Bending Moment ◽  
Test Results ◽  
Safety Factors ◽  
Supporting Structure ◽  
The Earth ◽  
Practical Engineering ◽  
Simulation Results

To improve the stress state of traditional antislide pile and utilize the stable soil on both sides of a landslide and slope foot, a spatial arc antislide pile supporting structure was proposed. Based on numerical calculation, a parametric study was conducted to assess the influence of the rise-span ratio on the stress state of the supporting structure, the displacement of the pile top, and the earth pressure in the front of the pile. The optimal rise-span ratio was 3-16 according to the numerical simulation results. An indoor model test at the optimal rise-span ratio was carried out, recording the pile strain and the earth pressure in front of the pile. The results showed that some indices increased with the increase in rise-span ratio, such as the load transferred to the pile at the arch foot, the bending moment of the piles, the displacement of the pile top, and the earth pressure; within a certain depth near the pile top, the soil in front of the pile is loose during the loading processes, and the earth pressure at the range was zero. The overall safety factors of the four supporting models were 2.42, 2.66, 2.78, and 2.84, respectively, which can satisfy the requirements for practical engineering. The test results verify the feasibility and rationality of the spatial arc antislide pile supporting structure, which can provide a new idea for landslide treatment.

scholarly journals Test Study on the Stress and Deformation Behaviors of a Shaft Supported by a Prefabricated Prestressed Structure

2019 ◽  
Vol 9 (4) ◽  
pp. 629 ◽  
Author(s):  
Guoqing Zhao ◽  
Suyun Meng ◽  
Chengli Guan ◽  
Yuyou Yang
Keyword(s):  
Lateral Displacement ◽  
Earth Pressure ◽  
Steel Structure ◽  
Soil Deformation ◽  
Deformation Control ◽  
Supporting Structure ◽  
The Earth ◽  
Test Study ◽  
Deformation Behaviors ◽  
Stress And Deformation

Soil deformation control is the key to shaft support. To better control soil deformation, improve construction efficiency, and reduce pollution, this study proposed a prefabricated prestressed supporting structure. The structure consisted of prefabricated steel structure units and special prestressed components. The structure units were applied to retain the soil. The screws were used for prestressing. Field prototype tests were conducted to assess the support effects and analyze the stress and deformation behaviors of the shaft. The earth pressure, the stress in the structure unit, and the lateral displacement of the soil were monitored. The measured earth pressure varied between the earth pressure at rest and the passive earth pressure. The stress of the supporting structure was far less than the yield strength of steel. Changes in the earth pressure and structural stress can be divided into four stages: rapid attenuation, fluctuation, slow change, and stabilization. Both the earth pressure and the structure stress completed the major attenuation within three days of prestressing. The surrounding soil moved out from the shaft under prestress conditions and exhibited an obvious space-time effect. The study of stress and deformation provides guidance for the construction of newly prefabricated prestressed structures.

The Research on Earth Pressure behind Inclined Retaining Wall Considering Arching Effects

2013 ◽  
Vol 790 ◽  
pp. 410-413
Author(s):  
Jian Ming Zhu ◽  
Qi Zhao
Keyword(s):  
Stress State ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Vertical Stress ◽  
Soil Arching ◽  
Active Pressure ◽  
Passive Pressure ◽  
The Earth ◽  
Two Factors

The earth pressure behind inclined wall considering the soil arching effects which was decided by two factors, the coefficient and average vertical stress, was necessary to research. Based on the analysis of stress state behind the retaining wall, the unified solution of active pressure and passive pressure was derived and was used to calculate both the magnitude and point of application. According to examples, as the angle of inclined retaining wall increasing which was signifying by , the arching effects would be also increasing which the soil was in the passive limit and be falling which the soil was in the active limit.

Stress Analysis and Measures Resistance to Deformation of Coal Pipeline above Goaf

2014 ◽  
Vol 986-987 ◽  
pp. 878-881
Author(s):  
Ke Yi Guo
Keyword(s):  
Stress Distribution ◽  
Stress Analysis ◽  
Earth Pressure ◽  
Bending Moment ◽  
Scientific Basis ◽  
Mining Subsidence ◽  
The Earth ◽  
Resistance To Deformation ◽  
Calculation Analysis ◽  
Technical Measures

Based on one company’s engineering of constructing underground coal pipeline above goaf, calculation analysis the influence of residual subsidence deformation and stress distribution of the coal pipeline engineering. The mining subsidence make the underground coal pipeline bearing not only the earth pressure of upper, lower and lateral, but also the result of the subsidence deformation include of vertical and horizontal in-plane bending moment. Based on this, put forward the anti-deformation technical measures to build new coal pipeline and provide scientific basis for anti-deformation design.

Model for predicting displacement-dependent lateral earth pressure

2009 ◽  
Vol 46 (8) ◽  
pp. 969-975 ◽  
Author(s):  
Guoxiong Mei ◽  
Qiming Chen ◽  
Linhui Song
Keyword(s):  
Earth Pressure ◽  
The State ◽  
Passive State ◽  
Test Results ◽  
Lateral Earth Pressure ◽  
The Earth ◽  
Proposed Model ◽  
Pressure Changes ◽  
The Relationship ◽  
Good Agreement

A model for predicting displacement-dependent lateral earth pressure was proposed based on an earth pressure – displacement relationship commonly observed in practice. The proposed model is a monotonically increasing and bounded function, with an inflection point at the displacement of s = 0 at which the earth pressure changes from the intermediate active state (the state between active and at-rest) to the intermediate passive state (the state between at-rest and passive). The proposed model can predict the relationship between earth pressure and retaining structure movement for any condition intermediate to the active and passive states, which was verified by the experimental data reported in published literature. The predicted lateral earth pressure coefficients are in good agreement with the test results of model tests reported in the literature.

Analyses of Earth Pressure on Gridding Concrete Retaining Wall in the Excavation of Deep Foundation Pit in Soft Soil Area

2011 ◽  
Vol 52-54 ◽  
pp. 2181-2186
Author(s):  
Guang Zhu Zhou ◽  
Xu Wei ◽  
Chen Yu
Keyword(s):  
Retaining Wall ◽  
Soft Soil ◽  
Earth Pressure ◽  
Front Wall ◽  
Three Dimension ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Finite Element Software ◽  
The Earth ◽  
Practical Engineering

This paper is mainly to study earth pressure on Gcrw used as a new kind of supporting structures in the excavation of deep foundation pits in soft soil region. On the basis of the simulation of step by step excavation by using big finite element software Abaqus/CAE and considering three-dimension elastoplastic stress state, the characteristics of different earth pressure are systematically discussed upon practical engineering. By comparing simulation results with calculated results based on calculation formula of Rankine Theory, it can be seen that the earth pressure in active zone is different from theoretic active earth pressure and earth pressure at rest while walls and soil in the gridding are regarded as a whole, which is greater than the former and somewhere similar to the latter, the earth pressure in passive zone is bigger than theoretic value of passive earth pressure, it is the tensive force from partition wall that prevent the front wall from overturning. These conclusions will be helpful for design and construction of new retaining wall.

scholarly journals Earth Pressure of Three-Dimensional Stress States under Different Strength Criteria and Its Application

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yu Zhang ◽  
Jin Liu ◽  
Te-Jia Fan ◽  
Chen-Yang Xu ◽  
Tian-Yi Meng ◽  
...  
Keyword(s):  
Stress State ◽  
Principal Stress ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Measured Data ◽  
Intermediate Principal Stress ◽  
Stress Effect ◽  
Passive Earth Pressure ◽  
The Earth ◽  
Stress States

To solve the Earth pressure problems in practical engineering, such as retaining walls and foundation pits, we derive active and passive Earth pressure formulas in accordance with the relationship between intermediate principal stress and excavation under three-dimensional stress states. The formulas are derived on the basis of the Mohr–Coulomb, spatially mobilized plane (SMP), σ 3 SMP, Lade–Duncan, axisymmetric compression- (AC-) SMP strength, and generalized Mises (Gen-Mises) criteria and then extended to clay. We also compare the calculated Earth pressure with the measured data. Results indicate that the Earth pressure considering medium principal stress contribution under a three-dimensional stress state is consistent with the actual engineering. The calculated active Earth pressure in the Mohr–Coulomb strength criterion is larger, and the passive Earth pressure is smaller than the practical one because the intermediate principal stress effect is not considered. The calculated results of the SMP, σ 3 SMP, Lade–Duncan, AC-SMP strength, and Gen-Mises criteria are close to the measured data, among which the result of the Gen-Mises criterion is closer. The Earth pressure calculated using the Lade–Duncan criterion is no longer appropriate to describe the Earth pressure under medium principal stress condition in this study. The results of this study have theoretical significance for retaining structure design under a three-dimensional stress state.

Influences of Beam-Arch Combination Bridge Structure Arrangement on Mechanical Characteristics

2011 ◽  
Vol 243-249 ◽  
pp. 1707-1710
Author(s):  
Ri Chen Ji ◽  
Yue Zhen Xu ◽  
Ying Zhe Sun
Keyword(s):  
Mechanical Characteristics ◽  
Bending Moment ◽  
Element Model ◽  
Structure Design ◽  
Design Parameters ◽  
Bridge Structure ◽  
Basic Frequency ◽  
Calculation Results ◽  
Practical Engineering ◽  
The Finite Element Model

For the arrangement of suspender and arch rib in the combination of beam and arch bridge, the finite element model is established according to the background of practical engineering. The influence of the variations of structure design parameters on structure characteristics of the static and dynamic is analyzed. The calculation results show that the different layout of suspender has small effect on the axial force variations of tie beam and arch rib, but has bigger influence on the bending moment of partial section. The structural transverse basic frequency augments with increase of arch rib leaning-angle, the vertical and twisting basic frequency is larger when the leaning suspender and netted suspender are used. The arrangement of suspender and arch rib should be optimized in the design of similar bridge.

The Calculation of Incremental Method Based on Earth Pressure Modification

2012 ◽  
Vol 256-259 ◽  
pp. 507-513
Author(s):  
Shou Ze Cheng ◽  
Wei Hua Wang ◽  
Chang Jie Xu
Keyword(s):  
Earth Pressure ◽  
Structure Design ◽  
Practical Calculation ◽  
Foundation Pit ◽  
Retaining Structure ◽  
Incremental Method ◽  
The Earth ◽  
Calculation Results ◽  
Practical Engineering ◽  
Incremental Step

Incremental method, as one of the practical calculation methods in retaining structure design of foundation pit, has been widely used. When incremental method is applied, the earth pressure, acting on the retaining structure on each incremental step, is considered as static earth pressure. Actually, the state of earth pressure changes constantly with the increase of soil displacement in the process of excavation. This paper introduces the relation of displacement and earth pressure based on the soil stress-strain state, and makes corrections for the earth pressure of the incremental method. By comparing with the measured data of the engineering, the calculation results, which consider earth pressure modification, are in good line with the practical engineering condition. The method in this paper can provide certain reference for related engineering design.

Two-Dimensional Numerical Simulation Analysis of the Diaphragm Wall Earth Pressure and Deformation Used the Cover Reverse Construction Excavation Method

2011 ◽  
Vol 243-249 ◽  
pp. 2732-2737
Author(s):  
Hong Bo Guo ◽  
Ke Sheng Ding ◽  
Yi Jia Zhang ◽  
Xu Li
Keyword(s):  
Simulation Analysis ◽  
Soft Soil ◽  
Constitutive Models ◽  
Earth Pressure ◽  
Diaphragm Wall ◽  
Deep Foundation ◽  
Construction Methods ◽  
The Earth ◽  
Test Parameters ◽  
Practical Engineering

The cover reverse construction excavation is one of the important construction methods which is used in digging extra-deep foundation system of underground continuous wall supporting. The earth pressure distribution and deformation is distinct from different construction methods. Even if the Construction methods and computer program is homogeneous, the earth pressure and deformation of the calculated showed various results because of different test parameters and different constitutive models, Through the application of practical engineering, The appropriate calculation parameters and constitutive model are found out in Abaqus program which is suitable for earth pressure and deformation of the diaphragm wall in the soft soil area.

scholarly journals Analysis of Soil Pressure in Indoor Model Test of H-Typed Prestressed Concrete Bank Protection Pile

2021 ◽  
Author(s):  
Song Zheng
Keyword(s):  
Prestressed Concrete ◽  
Earth Pressure ◽  
Bending Moment ◽  
Test Results ◽  
Sheet Pile ◽  
Soil Pressure ◽  
Scaled Model ◽  
Concrete Piles ◽  
Pressure Calculation ◽  
Different Depths

In order to explore the distribution of soil pressure on the side of the pile and the bending moment of the pile body during the excavation and pile loading stages of the H-shaped prestressed concrete piles, three groups of indoor scaled model tests with prestressed rectangular piles and with or without prestressed H-shaped piles were carried out, and the test results shows that the lateral earth pressure on both sides of the sheet pile has the same trend as the static earth pressure calculation value when it is not excavated, but the measured earth pressure at different depths is always lower than the static earth pressure calculation value; in the excavation stage, the H-shaped prestressed pile lateral soil pressure on the side of the pile excavation is less than that of the rectangular sheet pile and the unprestressed H-typed pile.

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