【作者】 柴贝贝；

【导师】 李广杰； 冯宏；

【作者基本信息】 吉林大学 ， 地质工程， 2012， 硕士

【摘要】 当前我国正在建设或规划中的水电建设项目多为大型水利工程，工程边坡的稳定性问题是水电站建设中的重大问题，其中对坝肩边坡稳定性的研究尤为重要，它关系到坝址的选取以及边坡支护设计方案的确定。因此，坝肩边坡的稳定性研究对工程施工的安全进行有重要的指导意义。辽宁蒲石河抽水蓄能电站是我国东北正在建设的大型水利水电工程，主要任务是担任东北电力系统的调峰、填谷及事故备用等功能，对东北电网的安全、稳定及经济运行有重要的作用。本论文依托于“辽宁蒲石河抽水蓄能电站可行性研究”项目，对下库右岸坝肩边坡的稳定性进行了深入细致的研究。本文是在野外地质调查的基础上，分析了下库右岸坝肩边坡的地质环境条件，并对坝肩边坡的岩体结构进行工程地质分级和岩体质量分级。之后，采用有限元软件ANSYS10.0，运用强度折减法对右岸坝肩边坡在天然、开挖工况下的稳定性做出了合理地评价。在此基础上提出了支护设计方案，并对支护后的边坡稳定性进行数值模拟分析。具体研究内容及成果如下：（1）通过现场地质调查可知：蒲石河抽水蓄能电站右岸坝肩边坡岩性主要是早元古界混合花岗岩，岩体中断层、节理较发育。根据结构面的规模进行工程地质分级，分为Ⅱ、Ⅲ、Ⅳ、Ⅴ四级，其中结构面主要为Ⅲ、Ⅳ级，对边坡局部稳定性有影响。（2）采用CSMR法对坝肩边坡的岩体质量进行分级，岩体质量等级为Ⅱ级和Ⅲ级，其中以Ⅱ级为主，所占比例为71%。由此可知：右岸坝肩边坡的整体稳定性较好，与野外的调查分析结果一致。（3）采用有限元强度折减法，利用ANSYS软件模拟了边坡在天然和开挖这两种工况下的应力、应变及塑性区分布特征、变化规律,并绘制了应力、应变云图。依据计算不收敛和特征点位移判据，确定边坡在天然和开挖工况下的安全系数分别为1.465和1.515。（4）应用有限元强度折减法对喷锚支护后边坡进行稳定性评价，通过模拟结果得出支护边坡的安全系数为1.755，岩体的稳定性明显提高。说明喷锚支护方案应用于蒲石河抽水蓄能电站右岸坝肩边坡是可行，合理的。更多还原

【Abstract】 At present, most of hydropower construction projects are large waterconservancy projects in our country. Engineering slope’s stability is the main problemin hydropower construction, and abutment slope’s stability is particularly important. Itis not only one of the key issues of the dam site selection but an important basis fordesign of slope support. Therefore, the stability study of the abutment slope willinfluence the safety of engineering.Pushihe Pumped Storage Power Station in Liaoning Province is the large waterconservancy projects in northeast of China which is under construction. It is to bearthe Northeast power system peak shaving and emergency standby. It plays animportant role in the security and stability of the Northeast power grid and alsoimportant to the economic operation. This paper relies on the project “The feasibilitystudy of Pushihe Pumped Storage Power Station in Liaoning Province”, and it has anin-depth and meticulous research on the stability of the right abutment slope.This paper was based on filed geological survey, and analyzed of the environmentand geological conditions of the right abutment slope. And it combined thecharacteristics of the rock and structure of the surface, conducted rock mass qualityclassification on the abutment slope of right bank. Then it used the method of strengthreduction by the finite element software ANSYS10.0, made a reasonable evaluation ofthe stability of abutment slope on the right bank on nature and excavation conditions.On this basis, it proposed the design scheme of support, and analyzed the stability ofthe supported slope. The specific research results are as follows:(1)Through the field geological survey, it showed the lithology of right abutmentslope is early Proterozoic mixed granite, and faults and joints developed. According tothe scale of structural surface, we conducted engineering geological classification, andit is divided into II, III, IV, V. And the III and IV structural surface mainly has impacton the stability of local slope.(2)Through the field of qualitative classification and the method of CSMR, the rock mass quality of the right abutment slope was classed II and III. It was mainlyclass II, and the proportion is71%. We can conclude that the overall stability of theabutment slope mostly in the steady state, which is consistent with field surveyanalysis.(3)Using the method of strength reduction by the finite element software ANSYS,we got the stress, strain and plastic strain of the slope with different strength reductionfactor on nature and excavation conditions, and then according to the computationsconvergence and the displacement of feature points, we got the safety factor of slopeunder natural and excavation conditions are respectively1.465and1.515.(4) Using the method of strength reduction, we evaluated the stability of shotcreteslope. The supporting safety factor is1.755. According to the simulation results, itsignificantly improved the stability of the rock mass, which prove that the supportingplan is feasible and reasonable.更多还原