【摘要】：本文采用理論計算與數(shù)值模擬相結(jié)合方法，以三峽庫區(qū)龔家坊滑坡治理抗滑樁工程為例，計算了不同荷載工況下，滑坡體的穩(wěn)定性及抗滑樁上滑坡推力；分析了嵌巖段樁周巖體的橫向容許承載力及強度和變形參數(shù)，建立了樁-巖土體相互作用數(shù)值模型；研究了不同滑坡推力分布形式下，抗滑樁嵌巖段樁及巖體的應(yīng)力和變形規(guī)律，提出了合理的抗滑樁嵌巖深度。具體研究內(nèi)容和成果如下： （1）介紹了目前常用計算滑坡穩(wěn)定性及推力方法，即極限平衡法和有限元強度折減法，以及樁-巖接觸分析方法；給出了幾種抗滑樁嵌巖段內(nèi)力計算理論模型與基本假設(shè)。 （2）采用RMR和GSI圍巖分級系統(tǒng)及Hoek-Brown破壞準則，估算抗滑樁嵌巖段巖體橫向容許承載力及強度與變形參數(shù)，該方法能較好地反映巖體的非線性破壞特征；分析了抗滑樁嵌巖段巖體的橫向容許承載力，及其與巖體的物理力學(xué)性質(zhì)及庫水位影響的關(guān)系。此分析數(shù)據(jù)作為數(shù)值模擬計算的基礎(chǔ)，分析抗滑樁嵌巖深度計算模型。 （3）以野外地質(zhì)調(diào)查和勘探數(shù)據(jù)為依據(jù)，考慮庫水位漲落引起坡體地下水位的變化，建立滑坡-抗滑樁-庫水位耦合作用地質(zhì)模型；采用Geostudio中Slope\Seep\Sigma模塊，，分析不同庫水位工況，加樁前與加樁后，滑坡穩(wěn)定性系數(shù)及滑坡推力，坡體內(nèi)應(yīng)力應(yīng)變變化規(guī)律；采用Ansys中接觸分析模塊，考慮樁與樁周巖體非線性接觸分析特性，對樁周巖體進行彈塑性分析，建立綜合地質(zhì)與結(jié)構(gòu)的嵌巖深度優(yōu)化設(shè)計模型。 （4）在抗滑樁嵌巖段樁-巖非線性接觸分析、巖體力學(xué)參數(shù)及嵌巖效果的數(shù)值模擬基礎(chǔ)上，分析影響抗滑樁嵌巖深度設(shè)計的不同因素及其作用規(guī)律，進而系統(tǒng)地闡釋抗滑樁嵌巖作用機理，該研究成果是對經(jīng)典抗滑樁設(shè)計理論的闡釋和補充，為進一步優(yōu)化抗滑樁設(shè)計提供理論基礎(chǔ)。
[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.
【學(xué)位授予單位】：武漢工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV223;P642.22

【參考文獻】

相關(guān)期刊論文 前10條

1 張亞旭;王修信;莊海洋;;接觸對樁-土-結(jié)構(gòu)動力相互作用體系的影響[J];地震工程與工程振動;2009年06期

2 周強;袁銅森;向洪;;剛性抗滑樁錨固深度計算研究[J];湖南交通科技;2006年02期

3 林峰,黃潤秋;滑坡推力計算的改進Janbu法[J];工程地質(zhì)學(xué)報;2000年04期

4 師偉;史彥文;韓常領(lǐng);曹校勇;;RMR圍巖分級法與中國公路隧道圍巖分級方法對比[J];中外公路;2009年04期

5 陳昌富;肖淑君;;基于加權(quán)殘值法和統(tǒng)一強度理論抗滑樁合理錨固深度的確定方法[J];工業(yè)建筑;2009年01期

6 陳筠,宋建波;嵌巖抗滑樁設(shè)計理論和方法研究[J];貴州工業(yè)大學(xué)學(xué)報(自然科學(xué)版);2003年05期

7 劉春茂;董捷;邊成鑫;;懸臂式抗滑樁設(shè)計參數(shù)對其工作性能的影響分析[J];重慶建筑大學(xué)學(xué)報;2008年02期

8 陶志平;周德培;岳志勤;;滑坡推力計算中傳遞系數(shù)法的改進研究[J];路基工程;2006年05期

9 張文居;趙其華;劉晶晶;;參數(shù)變異性對抗滑樁錨固深度可靠度的影響分析[J];水文地質(zhì)工程地質(zhì);2006年03期

10 胡曉軍;王建國;;基于強度折減的剛性抗滑樁錨固深度確定[J];土木工程學(xué)報;2007年01期

本文編號：2233974