库水升降条件下库区及邻谷岸坡稳定性研究
发布时间：2018-11-16 10:44
【摘要】：岩石工程的许多破坏实例都与地下水的作用有关，而岩质边坡更是与水有密不可分的关系,据统计有90%的边坡破坏是由地下水的直接或者间接作用引起的。因此，在对岩质边坡进行稳定性评价时，考虑渗流场与应力场的耦合作用对正确评价岩质边坡稳定性具有重要意义。本文在总结分析当今渗流场与应力场耦合特征和计算模型基础上，建立等效连续介质数值模型，以镇安抽水蓄能电站库岸边坡为研究对象，研究了库水升降引起边坡渗流作用下坡体的应力应变场特征，进而对边坡的稳定性进行了分析。 本文采用方法及获得的主要认识如下： （1）总结了岩体渗透系数与应力的关系以及岩体渗流场与应力场的物理模型，并从这两方面来介绍耦合的特征。 （2）概括了渗流场与应力场耦合的数学模型，包括等效连续介质模型、裂隙网络模型、双重介质模型三种。总结了渗流场与应力场耦合的计算方法：有限单元法与离散单元法，两种方法各有适用性和局限性。 （3）以镇安抽水蓄能电站上库右岸单薄山梁边坡为研究对象，在研究坝址区工程地质条件基础上，应用Hoek-Brown经验强度准则对岩体的抗剪强度参数进行估算，为岩体边坡稳定性分析奠定可靠基础。 （4）建立等效连续介质数值模型，研究了在不同库水位条件下渗流作用对边坡应力场特征的影响，并对边坡的稳定性进行分析，模拟结果表明，，对于模拟边坡来说：①岩体的透水性对渗流的影响显著，表现为流线在岩体渗透系数变化的交界处出现明显的折射或不协调现象；随水位上升，背水坡坡面出现溢流现象；②最大主应力和最小主应力整体受渗流影响不明显，但局部监测点的最大、最小主应力受渗流影响较明显；渗流对剪应力的影响通过影响有效应力实现的；③渗流不会改变斜坡发生破坏时的位置，但会使边坡变形量变大；④库水位升高，稳定系数下降；库水位下降，稳定系数上升。
[Abstract]:Many failure examples of rock engineering are related to the action of groundwater, and rock slope is closely related to water. According to statistics, 90% of slope damage is caused by the direct or indirect action of groundwater. Therefore, when evaluating the stability of rock slope, it is very important to consider the coupling effect of seepage field and stress field to evaluate the stability of rock slope correctly. On the basis of summing up and analyzing the coupling characteristics of seepage field and stress field and calculating model, the numerical model of equivalent continuum medium is established in this paper. The bank slope of Zhenan pumped storage power station is taken as the research object. The characteristics of the stress and strain field of the slope under the seepage caused by the rise and fall of the reservoir water are studied, and the stability of the slope is analyzed. The main conclusions obtained in this paper are as follows: (1) the relationship between permeability coefficient and stress of rock mass and the physical model of seepage field and stress field of rock mass are summarized, and the characteristics of coupling are introduced from these two aspects. (2) the mathematical models of coupling seepage field and stress field are summarized, including equivalent continuum model, fracture network model and double medium model. The coupling calculation methods of seepage field and stress field are summarized: finite element method and discrete element method. The two methods have their own applicability and limitation. (3) taking the slope of thin hill beam on the right bank of the upper reservoir of Zhenan pumped Storage Power Station as the research object, based on the study of the engineering geological conditions of the dam site, the shear strength parameters of the rock mass are estimated by using the Hoek-Brown empirical strength criterion. It lays a reliable foundation for the stability analysis of rock slope. (4) the numerical model of equivalent continuum medium is established to study the influence of seepage on the stress field characteristics of slope under different reservoir water levels, and the stability of slope is analyzed. The simulation results show that, For the simulated slope: (1) the permeability of rock mass has a significant effect on seepage flow, which is reflected by the obvious refraction or disharmony of the streamline line at the junction of the rock mass permeability coefficient change; With the rise of water level, there is overflow on the slope surface of backwater slope, 2 the maximum principal stress and the minimum principal stress are not affected obviously by seepage, but the local monitoring point is the largest, and the minimum principal stress is affected by seepage. The influence of seepage on shear stress is realized by effecting effective stress; (3) seepage will not change the position of slope when failure occurs, but it will make the deformation of slope become larger; (4) the water level of reservoir will rise, the coefficient of stability will decrease, the water level of reservoir will decrease, and the coefficient of stability will rise.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4
本文编号：2335296
[Abstract]:Many failure examples of rock engineering are related to the action of groundwater, and rock slope is closely related to water. According to statistics, 90% of slope damage is caused by the direct or indirect action of groundwater. Therefore, when evaluating the stability of rock slope, it is very important to consider the coupling effect of seepage field and stress field to evaluate the stability of rock slope correctly. On the basis of summing up and analyzing the coupling characteristics of seepage field and stress field and calculating model, the numerical model of equivalent continuum medium is established in this paper. The bank slope of Zhenan pumped storage power station is taken as the research object. The characteristics of the stress and strain field of the slope under the seepage caused by the rise and fall of the reservoir water are studied, and the stability of the slope is analyzed. The main conclusions obtained in this paper are as follows: (1) the relationship between permeability coefficient and stress of rock mass and the physical model of seepage field and stress field of rock mass are summarized, and the characteristics of coupling are introduced from these two aspects. (2) the mathematical models of coupling seepage field and stress field are summarized, including equivalent continuum model, fracture network model and double medium model. The coupling calculation methods of seepage field and stress field are summarized: finite element method and discrete element method. The two methods have their own applicability and limitation. (3) taking the slope of thin hill beam on the right bank of the upper reservoir of Zhenan pumped Storage Power Station as the research object, based on the study of the engineering geological conditions of the dam site, the shear strength parameters of the rock mass are estimated by using the Hoek-Brown empirical strength criterion. It lays a reliable foundation for the stability analysis of rock slope. (4) the numerical model of equivalent continuum medium is established to study the influence of seepage on the stress field characteristics of slope under different reservoir water levels, and the stability of slope is analyzed. The simulation results show that, For the simulated slope: (1) the permeability of rock mass has a significant effect on seepage flow, which is reflected by the obvious refraction or disharmony of the streamline line at the junction of the rock mass permeability coefficient change; With the rise of water level, there is overflow on the slope surface of backwater slope, 2 the maximum principal stress and the minimum principal stress are not affected obviously by seepage, but the local monitoring point is the largest, and the minimum principal stress is affected by seepage. The influence of seepage on shear stress is realized by effecting effective stress; (3) seepage will not change the position of slope when failure occurs, but it will make the deformation of slope become larger; (4) the water level of reservoir will rise, the coefficient of stability will decrease, the water level of reservoir will decrease, and the coefficient of stability will rise.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4
【参考文献】
相关期刊论文 前10条
1 彭凯;宁正福;王桂丽;;页岩气藏双重介质渗流模型研究[J];重庆科技学院学报(自然科学版);2012年01期
2 张庆;郑光;许强;邓韧;;携剪实验和JRC-JCS模型在结构面抗剪强度取值中的应用[J];地质灾害与环境保护;2011年01期
3 刘立平,姜德义,郑硕才,雷进生,林登发;边坡稳定性分析方法的最新进展[J];重庆大学学报(自然科学版);2000年03期
4 刘建军,刘先贵,胡雅y=,张盛宗;裂缝性砂岩油藏渗流的等效连续介质模型[J];重庆大学学报(自然科学版);2000年S1期
5 李文秀;边坡稳定性分析的Fuzzy数学模型[J];化工矿山技术;1995年06期
6 朱珍德,徐卫亚;裂隙岩体渗流场与损伤场耦合模型研究[J];河海大学学报(自然科学版);2003年02期
7 彭德红;浅谈边坡稳定性分析方法[J];上海地质;2005年03期
8 冉启全,李士伦;流固耦合油藏数值模拟中物性参数动态模型研究[J];石油勘探与开发;1997年03期
9 毛昶熙;陈平;李定方;李祖贻;田永乐;;岩石裂隙渗流的计算与试验[J];水利水运科学研究;1984年03期
10 毛昶熙，段祥宝，李定方;网络模型程序化及其应用[J];水利水运科学研究;1994年03期
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