三峡库区涉水滑坡抗滑桩嵌岩深度研究
发布时间：2018-09-10 08:56
【摘要】：本文采用理论计算与数值模拟相结合方法，以三峡库区龚家坊滑坡治理抗滑桩工程为例，计算了不同荷载工况下，滑坡体的稳定性及抗滑桩上滑坡推力；分析了嵌岩段桩周岩体的横向容许承载力及强度和变形参数，建立了桩-岩土体相互作用数值模型；研究了不同滑坡推力分布形式下，抗滑桩嵌岩段桩及岩体的应力和变形规律，提出了合理的抗滑桩嵌岩深度。具体研究内容和成果如下： （1）介绍了目前常用计算滑坡稳定性及推力方法，即极限平衡法和有限元强度折减法，以及桩-岩接触分析方法；给出了几种抗滑桩嵌岩段内力计算理论模型与基本假设。 （2）采用RMR和GSI围岩分级系统及Hoek-Brown破坏准则，估算抗滑桩嵌岩段岩体横向容许承载力及强度与变形参数，该方法能较好地反映岩体的非线性破坏特征；分析了抗滑桩嵌岩段岩体的横向容许承载力，及其与岩体的物理力学性质及库水位影响的关系。此分析数据作为数值模拟计算的基础，分析抗滑桩嵌岩深度计算模型。 （3）以野外地质调查和勘探数据为依据，考虑库水位涨落引起坡体地下水位的变化，建立滑坡-抗滑桩-库水位耦合作用地质模型；采用Geostudio中Slope\Seep\Sigma模块，，分析不同库水位工况，加桩前与加桩后，滑坡稳定性系数及滑坡推力，坡体内应力应变变化规律；采用Ansys中接触分析模块，考虑桩与桩周岩体非线性接触分析特性，对桩周岩体进行弹塑性分析，建立综合地质与结构的嵌岩深度优化设计模型。 （4）在抗滑桩嵌岩段桩-岩非线性接触分析、岩体力学参数及嵌岩效果的数值模拟基础上，分析影响抗滑桩嵌岩深度设计的不同因素及其作用规律，进而系统地阐释抗滑桩嵌岩作用机理，该研究成果是对经典抗滑桩设计理论的阐释和补充，为进一步优化抗滑桩设计提供理论基础。
[Abstract]:Taking the anti-slide pile project of Gongjiafang landslide in the three Gorges Reservoir area as an example, the stability of the landslide body and the landslide thrust on the anti-slide pile under different load conditions are calculated by using the method of combining theoretical calculation and numerical simulation. The transverse allowable bearing capacity, strength and deformation parameters of rock-socketed surrounding rock mass are analyzed, the pile-rock-soil interaction numerical model is established, and the different landslide thrust distribution forms are studied. The stress and deformation law of rock block pile and rock mass of anti-slide pile are put forward, and the reasonable rock embedding depth of anti-slide pile is put forward. The specific research contents and results are as follows: (1) the commonly used methods to calculate landslide stability and thrust are introduced, that is, limit equilibrium method and finite element strength reduction method, and pile-rock contact analysis method; Several theoretical models and basic assumptions for calculating the internal forces of rock socketed sections of anti-slide piles are given. (2) the lateral allowable bearing capacity, strength and deformation parameters of rock mass in rock socketed sections of anti-slide piles are estimated by using RMR and GSI surrounding rock classification system and Hoek-Brown failure criterion. This method can better reflect the nonlinear failure characteristics of rock mass and analyze the transverse allowable bearing capacity of rock mass with anti-slide pile embedded rock and its relation with the physical and mechanical properties of rock mass and the influence of reservoir water level. This analysis data is used as the basis of numerical simulation and calculation. (3) based on the field geological survey and exploration data, the variation of groundwater level caused by the fluctuation of reservoir water level is considered. The geological model of landslide, anti-slide pile and reservoir water level coupling is established, and the Slope\ Seep\ Sigma module in Geostudio is used to analyze the landslide stability coefficient, landslide thrust, stress and strain change law of slope under different reservoir water level working conditions, before and after pile addition. Using the contact analysis module in Ansys, considering the nonlinear contact characteristics of pile and surrounding rock mass, the elastic-plastic analysis of pile surrounding rock mass is carried out. A comprehensive geological and structural optimization design model for rock socketed depth is established. (4) based on the analysis of pile-rock nonlinear contact, the numerical simulation of rock mechanics parameters and rock socketed effect. This paper analyzes the different factors that affect the design of anti-slide pile rock socketed depth and its action law, and then explains systematically the mechanism of anti-slide pile rock-socketed design. The research result is an explanation and supplement to the classical anti-slide pile design theory. It provides a theoretical basis for further optimization of anti-slide pile design.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223;P642.22
本文编号：2233974
[Abstract]:Taking the anti-slide pile project of Gongjiafang landslide in the three Gorges Reservoir area as an example, the stability of the landslide body and the landslide thrust on the anti-slide pile under different load conditions are calculated by using the method of combining theoretical calculation and numerical simulation. The transverse allowable bearing capacity, strength and deformation parameters of rock-socketed surrounding rock mass are analyzed, the pile-rock-soil interaction numerical model is established, and the different landslide thrust distribution forms are studied. The stress and deformation law of rock block pile and rock mass of anti-slide pile are put forward, and the reasonable rock embedding depth of anti-slide pile is put forward. The specific research contents and results are as follows: (1) the commonly used methods to calculate landslide stability and thrust are introduced, that is, limit equilibrium method and finite element strength reduction method, and pile-rock contact analysis method; Several theoretical models and basic assumptions for calculating the internal forces of rock socketed sections of anti-slide piles are given. (2) the lateral allowable bearing capacity, strength and deformation parameters of rock mass in rock socketed sections of anti-slide piles are estimated by using RMR and GSI surrounding rock classification system and Hoek-Brown failure criterion. This method can better reflect the nonlinear failure characteristics of rock mass and analyze the transverse allowable bearing capacity of rock mass with anti-slide pile embedded rock and its relation with the physical and mechanical properties of rock mass and the influence of reservoir water level. This analysis data is used as the basis of numerical simulation and calculation. (3) based on the field geological survey and exploration data, the variation of groundwater level caused by the fluctuation of reservoir water level is considered. The geological model of landslide, anti-slide pile and reservoir water level coupling is established, and the Slope\ Seep\ Sigma module in Geostudio is used to analyze the landslide stability coefficient, landslide thrust, stress and strain change law of slope under different reservoir water level working conditions, before and after pile addition. Using the contact analysis module in Ansys, considering the nonlinear contact characteristics of pile and surrounding rock mass, the elastic-plastic analysis of pile surrounding rock mass is carried out. A comprehensive geological and structural optimization design model for rock socketed depth is established. (4) based on the analysis of pile-rock nonlinear contact, the numerical simulation of rock mechanics parameters and rock socketed effect. This paper analyzes the different factors that affect the design of anti-slide pile rock socketed depth and its action law, and then explains systematically the mechanism of anti-slide pile rock-socketed design. The research result is an explanation and supplement to the classical anti-slide pile design theory. It provides a theoretical basis for further optimization of anti-slide pile design.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223;P642.22
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