受软弱结构面控制的岩质边坡失稳风险评价的参数和模型研究

项目名称： 受软弱结构面控制的岩质边坡失稳风险评价的参数和模型研究

项目编号： No.51209156

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 邢会歌

作者单位： 四川大学

项目金额： 27万元

中文摘要： 本课题依托锦屏一级水电站左岸高陡岩质边坡工程，以受软弱结构面控制的岩质边坡为研究对象，采用现场调查、室内外试验、理论分析和数值计算等手段，对边坡失稳风险评价中的参数和模型进行研究。通过室内外力学试验和工程地质勘测，研究软弱结构面的强度变形特征，提出一个基于Hoek-Brown准则的结构面抗剪强度参数估算模型，建立软弱结构面工程地质特性与力学参数之间的关系。在考虑边界条件和力学参数的随机性及不确定性的基础上，结合可靠性分析方法和极限平衡原理，建立受软弱结构面控制的岩质边坡失稳风险评价模型。重点研究降雨条件下软弱结构面抗剪强度参数的弱化问题，建立结构面力学参数、地震动力条件和边坡失稳风险之间的关系，提出降雨、地震条件下岩质边坡失稳风险的演化机制。研究得到的软弱结构面抗剪强度参数取值范围及失稳风险指标可为岩质边坡的安全稳定控制提供理论依据，具有较高的学术意义和社会价值。

中文关键词： 边坡失稳；软弱结构面；抗剪强度参数；完成情况；研究成果

英文摘要： In this research work, the high-steep rock slope at left bank located at the Jinping I Hydropower Station is taken as a case study example, and the key issue is the weak discontinuities in this slope. Field survey, indoor and field testing, theory analysis and numerical computation are adopted to study the parameters and model for the risk assessment of rock slope which controlled by the weak discontinuities. Combined with the indoor, field testing of weak discontinuities and field geological investigation, the strength and deformation properties of weak discontinuities are researched. A shear mechanical parameters evaluation model is presented base on the Hoek-Brown failure criterion, the relationship between engineering geological properties and mechanical parameters of weak discontinuities is established. Beyond the consideration of the random and uncertainty characteristics of boundary condition and mechanical parameters, a risk assessment model combining with reliability theory and limit equlibrium method is presented for the rock slope which controlled by weak discontinuities. Then the weakening mechanism for shear strength parameters of weak discontinuities under rainfall condition is researched, the relationship between mechanical parameters of discontinuities, seismic loading conditions and slope disabi

英文关键词： slope instability；Weak discontinuity；Shear strength parameters；Completion situation；Research Achievements