基于立体投影和3DEC的某水电站裂隙岩体边坡稳定性研究

The Study for the Jointed Rock Mass Slope Stability of A Hydropower Station Based on the Stereographic Projection and 3DEC Method

裂隙岩体边坡稳定性研究是国内外岩土工程领域研究的热点问题,传统方法在评价裂隙岩体边坡稳定性时具有诸多限制。本文以某水电站溢洪道开挖边坡为例,提出了考虑确定性结构面与随机性结构面,基于立体投影和3DEC的裂隙岩体边坡稳定性分析方法。在水电站工程地质调研的基础上,确定了优势结构面,开展了结构面力学参数的现场试验,采用立体投影方法进行了设计边坡角下边坡可能滑动模式分析;依据可能的滑动模式,建立了三维非连续地质模型与数学力学模型,进行了自然、暴雨、地震三种工况下的位移与稳定性分析。该成果为裂隙岩体边坡稳定性研究提供了一种新的高效的方法,对相似工程具有借鉴作用。

The study for slope stability is the hot issue in geotechnical engineering field at home and abroad,and the traditional method for evaluating the jointed rock mass slope stability has many limits.The spillway excavation slope of a hydropower station in Tibet was taken as a case study,and the study method for slope stability of jointed rock mass based on stereographic projection and 3DEC method,with taking deterministic and random discontinuities into account,was put forward in this paper.The preferred discontinuities were determined on the basis of engineering geological research,the in-situ tests of mechanical parameters of discontinuities were carried out,and the possible sliding modes of slope with the designed slope angle were analyzed by using stereographic projection method.The 3D discontinuous geologic and mathematical mechanical model was built to analyze displacement and stability in nature,heavy storm and earthquake conditions.The achievements provide a new efficient way for jointed rock mass slope stability study,and give guidance for similar engineering.