【作者】 蒋磊；

【导师】 张可能；

【作者基本信息】 中南大学 ， 地质工程， 2012， 硕士

【副题名】相山大道K3+260～660段左侧边坡稳定性分析与控制为例

【摘要】 湖南郴州地处山区和丘陵地区,近年来,在以相山大道、郴资桂公路改扩建工程为代表的市政项目的建设过程中,经常遇到滑坡以及路堑工程边坡在工后运营期的失稳问题。边坡是个开放的体系,在外界因素的共同作用下(如降雨、人工开挖等),边坡的工程地质、水文地质特性以及边坡的变形都会随时间而动态的发展变化,进而边坡的稳定性也会随之发生改变。目前,在传统的边坡稳定性分析方法中,通常是采用极限平衡理论,忽略了岩土体的蠕变特性,没有考虑边坡因随时间发展,蠕变变形增加,工程地质情况变化以及物理力学参数弱化,抗剪强度降低等问题,从而导致边坡稳定性安全系数降低甚至滑坡灾害启动。因此考虑岩土体蠕变特性对边坡长期稳定性分析和滑坡灾害预报具有重要意义。本文以相山大道K3+260～K3+660段左侧路堑边(滑)坡作为研究对象,分析滑坡岩土体的形成原因,并对边坡岩土的主要构成物质红粘土进行基本物理力学性质和强度水敏感性试验,建立了相关函数模型,表明岩土体强度参数随含水率增加强度衰减的规律；根据岩土体流变理论的研究,分析了相山大道K3+260～K3+660边坡变形的蠕变特性,以及在降雨作用下,降雨对边坡蠕变变形的“等效加载”效应；然后在考虑红粘土蠕变特性的基础上,对相山大道K3+260～K3+660段边坡工程进行稳定性分析计算；并通过采用PLAXIS有限元分析程序来对边坡第三次滑动后的状态进行蠕变变形模拟分析,验证分析了边坡的蠕变破坏特性、过程,最终蠕变位移不收敛。在此基础上,对蠕变边坡进行监测,采取了动态处治和评价,起到了很好的效果,避免了第四次大规模滑坡的发生。更多还原

【Abstract】 Hunan Chenzhou is located in the hilly and mountain region, in recent years, with the Xiangshan road and chenzigui road reconstruction projects, as a representative of the municipal construction project process, often meet with instability issues like landslides and instability of cutting slope in the operation period. Slope is an open system, in under the common function of external factors (such as rainfall, artificial excavation), the slope of the engineering geological and hydro-geological characteristics and slope deformation will change dynamically over time, and the stability of the slope will also be changed. At present, in the traditional slope stability analysis method, usually with the limit equilibrium theory, ignoring the creep property of geotechnical engineering, no consideration for slope development over time, creep deformation increase, engineering geological conditions change and physical mechanical parameters of weakening, shear strength lower, leading to the stability of the slope safety coefficient decreasing and even landslide disaster. So it is great important meaning to consider creep characteristics of long-term slope stability analysis and landslide disaster forecast.Based on the Xiangshan Road in K3+260-K3+660for cutting slope or landslide on the left as the research object, this paper analyzes the geotechnical engineering formation reasons of the landslide, and the main composition red clay basic physical and mechanical properties of strength and water sensitivity test; establish the relevant function model, showing the law that geotechnical strength parameters with the moisture content increase,the strength attenuation; According to the theory of geotechnical rheology, this paper analyzes the Xiangshan Road K3+260-K3+660slope deformation of the creep characteristics, as well as in under the effect of rainfall, and "equivalent load" effect as rainfall on the slope creep deformation; Then in considering the red clay creep characteristics, the Xiangshan road in K3+260-K3+660slope stability analysis is calculated; Further, by the use of the PLAXIS finite element analysis software to simulate the creep deformation of the third time landslide state, it proves of the slope creep damage characteristics, process, and no convergence creep displacement. Finally, dynamic treatment and evaluation is carried out according to the creep slope monitoring, the result shows a good effect and avoids the happening of the fourth big landslide.更多还原