【作者】 季宗亿；

【导师】 涂兴怀；

【作者基本信息】 西华大学 ， 水利水电工程， 2010， 硕士

【摘要】 边坡的稳定性受诸多因素的复合作用,各因素对边坡稳定性的影响程度决定了边坡工程的复杂性、不确定性和模糊性。如何尽量减小因地质勘查及土工试验的局限性而引起力学参数取值的不确定性是处理岩质高边坡稳定性问题的难点之一,因此对岩土体参数进行敏感性分析尤为重要。本文以泸定电站泄洪洞出口边坡为例,采用灰色关联分析方法对影响边坡稳定性的主要因素进行敏感性分析,并根据参数敏感性分析的结果调整参数取值。运用有限差分软件FLAC3D进行多参数工况的应力应变分析,根据计算结果初步评判参数取值是否正确、合理。根据Mohr-Coulomb抗剪强度准则,运用FISH语言编写求解模型单元安全系数的代码,得到了边坡每个单元的安全度分布。相比强度折减法只能得到边坡的整体安全系数而言,单元安全系数能够反映边坡每个部位的稳定程度。结合应力应变计算的结果综合判断各参数值对模型的响应是否正确合理,以此确定岩土体的参数取值。在选定坡体参数取值的基础上进行不同支护方案的计算分析,并结合现场监测资料综合评判参数取值的正确性以及支护方案的可行性、合理性、经济性,为工程设计及施工提供参考。更多还原

【Abstract】 Slope stability is affected by many factors. The degree of influence on the slope stability by those factors makes slope engineering more complex, uncertain and fuzzy. How to minimize the uncertainty of mechanical parameters’values, caused by the limit of geological exploration and geotechnical test, is one of the difficulties to handle with high rock slope stability. As a result, sensitivity analysis of rock mass parameters is particularly important.In this thesis, Gray Correlation Analysis was applied to high rock slope at the outlet of spillway of Luding hydropower project, and then the values of rock mass parameters were analyzed on the basis of the results of sensitivity analysis. Then the finite difference software FLAC3D was used to analysis the stress and strain of slope with multi-parameter working conditions. After that we can judge whether the values of parameters are correct and reasonable by calculations preliminary.A code module for the zone safety degree of slope was programmed using the programming language FISH available with FLAC3D according to Mohr-Coulomb shear strength criterion. Compared that shear strength reduction technique which can only getting the overall safety factor of slope, Zone safety factors reflect various parts of slope stability. We can evaluate whether the value of each parameter of model’s response is correct and reasonable combing with the results of stress-strain calculation, in order to determine the parameters of rock mass.Different reinforcement schemes are calculated and analyzed on the basis of selecting slope parameters’values, and then the correctness of parameters’values, the feasibility, reasonability and the economy of slope excavation programs are evaluated on the basis of site monitoring data to provide a reference for engineering design and construction.更多还原