Anti-slide Pile Research Articles

The Load Carrying Mechanism of Plate-Chair Type Retaining Structure

The plate-chair type retaining structure, which developed from h type anti-slide pile, has the characteristics of high stiffness and small deformations, and is suitable for subgrade retaining engineering on high slopes. The difficulty is that the landslide thrust distribution is not clear and the action of soil between the front and back row piles is not definite. First, a theoretical method of calculating the earth pressure acting on the structure is presented based on analyzing its carrying mechanism. Then an example is analyzed using the method. Finally, on the base of constructing a three-dimensional numerical simulation model of soil-structure interaction using ABAQUS, a validation and comparison between the theoretical calculation and numerical simulation is carried out. The result shows that the method is simple, safer, suitable for designing and can be used in the similar engineering.

Research on Stability Analysis of Soil Slope in Consideration of Creep Property

The Viscoelasto-Plastic Model with Double Yield Surface is introduced in detail. Finite element equations are introduced when the deformation is considered under Coupled Deformation and Seepage Fields. The response of one soil slope is simulated during rapid drawdown of water level by FEM. The results calculated show that the critical slip surfaces and safety factors by two ways are pretty close. To assure the safety of the slope, the design of anti-slide piles is carried out. Those ways used may provide reference to engineering practice.

Summary on Research Advances on the Reservoir Bank Instability

The reservoir bank instability is the outcome combined the action of the external factors with the action of the internal factors. The limit equilibrium analysis, the strength reduction finite element method, the saturated/unsaturated seepage coupling and so on were applied to analyze the reservoir bank stability. The condition analogy graphical solution methods, the mathematical analysis method, the balanced cross-section method and so on were applied to forecast the reservoir bank stability. The reservoir bank instability mechanism depends on the physical action, the chemical action and the mechanical action of the water in the reservoir bank rock and soil. At present, the drainage measure, the cutting slope and reducing load measure, the retaining and supporting measure , the anti-slide piles measure and so on have been widely used to control the reservoir banks instability. Aiming at the research status of the reservoir bank instability, the problems in study and the suggestions for future work are pointed out in this paper.

Numerical modelling study of the load sharing law of anti-sliding piles based on the soil arching effect for Erliban landslide, China

This paper presents a new model of the load sharing law with a three-stage load sharing pattern via a representative case study in the Three Gorges reservoir region, China. A definitive new three-stage load transfer pattern is presented, including end-bearing soil arching, friction soil arching and the sliding mass in front of the pile. By means of the soil arching effect between the anti-sliding pile and landslide mass, the law of the load sharing ratio under different cases, including different intervals, section dimensions, driving forces, and shearing parameters of the sliding mass and the pile-soil interface, is presented by using the explicit finite-difference numerical modelling method. The results show that (a) the effect scale of the soil arching effect is within the scale of four times of the width of the pile; (b) the soil arching only exits within a certain pile interval, and it will become inefficiency beyond the maximum pile interval; (c) there is a threshold value for the cohesion strength parameters of the sliding mass, beyond which the load sharing ratios of soil arching keep in a steady level.

Sensitivity Analysis of Shear Stress between the Landslide and Pile

There are many factors which can affect the mechanical properties of interface .Targeted research about effect anti-slide pile design parameters act on the contact stress is carried out in this paper. Based on the specific slope example and the principle of orthogonal experiment, the effect that the pile spacing (s), pile cross section width (b), pile cross section length/ width (h/b), the pile length (L) conduct on the maximum shear stress between the landslide and anti-slide pile is thoroughly discussed by combining with orthogonal design method and numerical simulation organically. The results show that (1) The order of influence factors respectively is L, S, b, h / b for the maximum shear stress on interface in the front of pile, and it is L, b, S, h / b for the maximum shear stress on behind of pile;(2) L is the main factor that affects the maximum shear stress on the interface between anti-slide pile and soil;(3) Effect about S and L acting on maximum shear stress of the interface respectively is significant and very significant; h/b has no significant effect on maximum shear stress of the interface.

Deformation and Stability Analysis of Large Slope Based on ADINA Software

Slope failure is a kind of serious geologic disaster. This paper based on the detailed geology survey and analysis, judged the failure mode of the Pipayuan slope; Using ADINA which is professional finite element software, made mechanic calculation of slope, analyzed the stress condition and discussed the change of stress. According to the Strength Reduction Method, the slope stability safety coefficient was calculated. Results show that: the whole slope, may be slide along the soft interlayer, especially in the case in the event of heavy rainThe effectiveness is verified by the finite element calculation of slope with anti-slide pile reinforcement.

Analysis and Treatment of Landslide at the Tunnel Portal in Nanjing Road

The landslide at the tunnel portal in Nanjing Road is mainly determined by a weak intercalated layer between the completely weathered bedrock and the strongly weathered bedrock. The weak intercalated layer has low permeability and weak shear strength, and its interface dip outside of the slope. As the consequence, landslide is likely to happen again due to a rainstorm or other inducement. In order to prevent a second landslide, a comprehensive treatment scheme is presented, which implements anti-slide piles as the major treatment and several auxiliary treatments including filling and compacting the cracks, cutting-off and draining water, locally bolt-shotcrete support, and repairing the existing retaining wall and the lattic frame beams. After applying this scheme, the slope stability meets the design requirements.

Mechanism and Theoretical Calculations of Buttress Anti-Slide Pile

Anti-slide pile was widely used in the slope-sliding control，based on the traditional Anti-slide pile, a kind of high efficiency and good effect new slope anti-slide pile-Buttress Anti-slide Pile-was put forward,which changed the cantilever stress condition and the mechanism of depending entirely on lateral subgrade reaction to balance the landslide thrust of the traditional anti-slide pile, and the theoretical calculation formula is deduced.

Research on Suitable Anti-Sliding Piles Spacing Considering of Soil Arch Effect in Colluvial Landslide

Suitable anti-sliding spacing is one of the most important parameters in the design of anti-sliding piles. It is closely related to whether the soil arch effect can be completely played. Based on analyzing the stress model of soli arch effect on the adjacent soil, the relationship between the piles spacing and the cohesive force c as well as the internal friction angle of the soil behind piles is proposed. The reasonable pile spacing formula which based on the limiting equilibrium equation of state was deduced and verified the method with engineering practice.

Failure Mechanism of a Slope Anti-Sliding Pile

According to finite element strength reduction method，the article has discussed the failure mechanism of anti-sliding pile by using finite element software MIDAS /GTS ，exploration report and anti-sliding pile design data.The comparative analysis shows that the failure of anti-siding pile is contributed by the slope excavation and rainwater.The analysis method and results can provide reference significance to other anti-sliding pile design.This paper also provide a feasible method for prediction of consequence in slope excavation.

抗滑桩支挡工程在重庆市三峡库区某滑坡治理工程的应用

以重庆市三峡库区仁沱滑坡治理工程为例，论述了滑坡的基本特征、成因，对滑坡的稳定性进行了分析评价，在此基础上提出了滑坡治理的工程设计方案。通过工程实例分析表明，抗滑桩支挡工程在滑坡治理工程中经济、安全、合理，能够满足设计要求，工程效果良好，经济效益和社会效益显著，为三峡库区地质灾害防治提供了经验。 In the city of Chongqing in the Three Gorges Reservoir Rentuo landslide treatment engineering as an exam- ple, discusses the basic features, genesis of landslide, to evaluate and analyze the stability of landslide, on the basis of the proposed design scheme of landslide treatment engineering. Through the project example analysis shows that, the anti-slide pile retaining structure in landslide control projects of economic, security, reasonable, can meet the design requirements, the project has good effect, obvious economic benefit and social benefit, provide the experience for the prevention and control of geological disasters in Three Gorges Reservoir area.

The Influence of Reservoir Level Plummeting on Slope Stability Reinforced by Pile

Lagrange finite difference method basing on the strength reduction principle is applied to simulate the reinforcement effect of anti-slide pile for slope under water plummeting condition. The influence factors of reinforcement effect including speed of water level plummeting, the ratio between water depth and slope height, the location of pile is discussed. The study results show that the higher speed of water level plummeting may result in less value of slope safety factor. Moreover, the relationship between the ratio between water depth and slope height change significantly before and after reinforcement under water level plummeting condition. The study also reveal that the location of pile have important influence on the reinforcement effect.

Research Review on Bearing Capacity of Pile Foundation under Complex Loads

With the deepening of China's urbanization, the urban construction land in the mountainous areas is becoming increasingly tense, more and more bulidings pile had to be built on the hillsides. The pile is not only as foundation, but also have the role of reinforcement slope, its mechanical property is complex more than the anti-slide pile and ground piles under lateral load. Now the analysis against its bearing characteristics and deformation mechanism are not perfect, carrying out a thorough and meticulous research review is necessarily. Based on the review of current study on pile under icomplex loads, the present study provides a train of thought for further research on the behavior of pile under complex load.

Numerical Simulation Method Ascertaining Slope Stabilization Anti-Slippery Pile's Basic Parameters

Although anti-slide pile take a key position in slope-treating measures, the method of designing is far from perfect. The methods used in actual projects are based on the rigid body limit equilibrium methods. There is a tendency to using numerical methods in the progress of pile-designing. The safety factor of landslide is calculated according to shear strength reduction theory in the numerical simulation software. Using the shearing forces on pile and the safety factor can ascertain the position of anti-slide piles, the area and distance of piles. For numerical simulation can well perform the simulation slope moving and the load on piles and can give a more reasonable designing.

The Calculation of Landslide-Thrust Based on Reliability Theory

For current engineering of anti-slide piles, many problems exist in the calculation of landslide-thrust. Therefore, a new method based on the reliability theory combined with strength reduction FEM is introduced, and the landslide-thrust acting on anti-slide pile is researched here. In this method, the safety factor of slope can be caculated without assuming the shape and position of failure surface beforehand, the randomness of physical and mechanical parameters of slope are introduced, and the combined action of retaining structure and rock mass is considered. Meanwhile, the thrust distribution form and structural internal force can be calculated, which are also probabilistic. A case study shows that the calculation results are more reasonable and the applicability of proposed method is clearly dependable in calculating the landslide thrust.

Protection Control Scheme and Evaluation of Effectson Pipeline Crossing beneath Landslide Area

Long-distance natural gas transmission pipelines are planned to pass through the mountain area of midwest China, portions of which are threatened by severe landslide hazards. Therefore, the protection plan and control scheme for pipelines traversing and/or exiting landslide areas are of increasing interest and importance. A typical landslide in western China was used as an example to implement the strategy and evaluate the safety for a typical underground pipeline crossing the landslide area. The investigation and resulting control measures are based on the engineering geological study, and the numerical (finite-difference) interactive model of the pipeline and landslide, including the effect of soil arching. The effect of key design factors, including the spacing of antisliding piles, is determined by three-dimensional finite-difference numerical modeling. This technique also calculates the stability coefficient by use of the strength reduction method and calculation of stress and displacement fields. The results show that the recommended deployment of the antisliding piles can dramatically improve stability by reducing the effect of the landslide, thereby maintaining the displacement and stress of the pipeline within acceptable limits.

Stability Analysis of a Reinforced Soil Slope Based on the Strength Reduction Method

Apply large general-purpose finite element analysis software ABAQUS as a platform, The criterion of iteration non-convergence conventionally used for assessing the instability state of slopes,and an example is given to the following conclusions: The strength reduction method based on ABAQUS simulate anti-slide pile slope stability analysis that has a true reflection of the elastic-plastic deformation in geotechnical engineering,it can be widely used in elastic-plastic deformation problems in geotechnical engineering. The anti-slide pile can effectively improve the stability of slopes, setting up anti-slide pile egitimately in the soil plays an important role at the safety of slope stability.

The Analysis of Pile Deformat on Impact Factor of Pile Retaining Wall in Expansive Soil Area

Anti-slide pile deformation of pile retaining wall in expansive soil region was analyzed in this article. Main factor which affected deformation of the anti-slide pile was discussed. The result showed that expansive power and pile embedded solid depth was the main factor which affected the deformation of the pile in expansive soil region. Engineering measure related to the anti-slide pile deformation was alalyzed to show that the anchor cable could effectively controlled the deformation. As well as the order of the anchor cable and slaking effect of expansive soil had a great impact on the pile deformation. It can be used as reference for the design and construction of the pile retaining wall in the expansive soil region in future.

Stability Analysis of Soil Slope and the Design of Anti-Slide Piles during Unsteady Seepage

Principle of calculation of water and earth pressures together by Limit Equilibrium Method (LEM) is introduced, and coupled deformation and seepage analysis is conducted by Finite Element Method (FEM ).The response of one soil slope is simulated during rapid drawdown of water level by LEM and FEM. The results calculated show that seepage upraises the critical slip surfaces, and critical slip surfaces and safety factors by two ways are pretty close. To assure the safety of the slope, the design of anti-slide piles is carried out. Those ways used may provide reference to engineering practice.

Arching Effect of Anti-Slide Piles in Non-Cohesion Soil

In recent years, Anti-slide pile has been widely used in soil reinforcement works, but the pile soil interaction is not very clear. Numerical simulation was used in this article to analyze the soil arcing effect between anti-slide piles in non-cohesive soil and the main influencing factors, such as soil horizontal pressure, pile spacing and so on were also analyzed. The results show that there has soil arching in non-cohesive soil, and the soil arching effect becomes significantly with the horizontal earth pressure increases, but when the pressure increases to a certain degree, the soil arching will be damaged. The pile spacing is also a major factor to affect the soil arching effect, increases with the pile spacing, the soil arching effect gradually weakened.