缙云抽水蓄能电站节理岩体边坡开挖稳定性综合评价  

Comprehensive Assessment on Excavation Stability of Rock Slope in Jinyun Pumped Storage Power Station

作　　者：史作言 吴小林 鲍利佳 王健 张文涛 祁长青[2] SHI Zuoyan;WU Xiaolin;BAO Lijia;WANG Jian;ZHANG Wentao;QI Changqing(Zhejiang Jinyun Pumped Storage Co.Ltd.,Lishui 321400,Zhejiang China;School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]缙云抽水蓄能有限公司,浙江丽水321400 [2]河海大学地球科学与工程学院,南京211100

出　　处：《河南科学》2021年第12期1981-1987,共7页Henan Science

基　　金：国家自然科学基金面上项目(41877212)。

摘　　要：边坡稳定性一直是工程建设中重点关注的问题,在边坡开挖前需要进行详尽的研究.针对缙云抽水蓄能电站开关站边坡开挖工程,通过现场勘查、室内试验、运动学分析、极限平衡分析和离散元模拟等手段,对边坡的岩体结构特征、岩体质量、边坡变形破坏模式和稳定性进行了详细研究,结果表明:(1)开关站边坡岩体完整性中等到好,岩体质量中等,满足作为开关站建设要求;(2)运动学分析显示边坡开挖后可能的破坏模式为平面滑动、楔形体滑动和倾倒变形模式;(3)极限平衡分析表明开挖后边坡安全系数较高,边坡整体较为稳定的,发生大规模滑动的可能性较低;(4)离散单元模拟结果显示边坡开挖后在坡顶近地表块体有发生剪切变形的可能性,而台阶开挖处块体可能发生局部拉张破坏,在施工中应及时采取有效的支护和预防措施.本研究成果可以为类似的抽水蓄能电站边坡开挖稳定性评价提供方法参考.Slope stability always addresses the interests of engineers during the construction of a mountainous area project,especially for a slope excavation engineering. Aiming at the slope stability of the switchyard in Jinyun pumped storage power station,a series of studies including field survey,laboratory tests,kinematic analyses and limit equilibrium analyses were carried out. Comprehensive understanding on rock mass structure,rock mass quality,failure mode and stability of the slope was achieved. Results show as follows:(1)The rock mass integrity of switchyard slope is fair to good and the rock mass quality is fair,which can satisfy the mechanical requirement of the structure foundation.(2)Kinematic analyses indicate that the potential failure mode of the slope includes planar failure,wedge failure and toppling.(3)Limit equilibrium analyses illustrate that the slope is more stable with a relatively large factor of safety,indicating that there is little possible of large landslide.(4)Distinct element simulation indicates that the blocks at the top of the excavation slope can reach shear failure,and the blocks near the step of the slope may undergo tension failure and collapse. Prevention and treatment measures should be prepared before the excavation of the slope. The findings can provide reference for rock slop excavation stability assessment of other pumped storage power station.

关 键 词：抽水蓄能电站 岩质边坡 岩体质量 破坏模式 稳定性评价 

分 类 号：P642.22[天文地球—工程地质学] TU195[天文地球—地质矿产勘探]