某冲砂闸坝基深层抗滑稳定三维计算分析  

Three-dimensional Analysis on Deep Anti-sliding Stability of Dam Foundation of a Scouring Sluice

作　　者：孙永广 SUN Yongguang(Lanshan District Chashan Irrigation of Linyi City of Shandong Province,Linyi 276000,China)

机构地区：[1]山东省临沂市兰山区茶山灌溉所,山东临沂276000

出　　处：《人民珠江》2018年第10期74-78,共5页Pearl River

摘　　要：为了探究闸坝复杂地基中含有剪切破碎带时的变形破坏机理,以某水利工程泄洪冲砂闸为例,采用有限差分软件FLAC-3D对该泄洪冲砂闸的坝基深层抗滑稳定进行三维有限元分析和计算,通过不断折减坝基岩体力学参数,得到了坝基岩体等效塑性应变和位移的变化趋势。结果表明:随着折减系数的增加,闸坝上、下游岩基塑性屈服区域逐渐扩大,位移也逐渐增大;当折减系数为7. 8时,坝基塑性屈服区贯通Cr4软弱破碎带,同时关键点位移发生突变,确定了该闸坝的深层抗滑稳定最大安全系数在7. 1~7. 8之间。研究成果对类似闸坝工程的稳定验算和分析有一定参考价值。In order to study the deformation and failure mechanism of the dam foundation with shear fracture zone, taking a scouring sluice of water conservancy project as an example, FLAC-3D was used to analyze the deep anti-sliding stability of dam foundation. By reducing the rock mass mechanical parameters of dam foundation, this paper obtained the change trend of equivalent plastic strain and displacement of dam foundation rock mass. The results showed that, with the increase of the reduction coefficient, the rock plastic area in upstream and downstream of scouring sluice would expand gradually, and the displacement would increase obviously. When the reduction coefficient reached 7.8, the plastic zone would connect with Cr4 weak fracture, while the displacement of key points would change suddenly. It could determine the safety coefficient of deep anti-sliding stability was between 7.1 and 7.8. The research could provide some references for similar engineering.

关 键 词：剪切破碎带 折减系数 FLAC-3D 塑性应变 安全系数 

分 类 号：TV212[水利工程—水文学及水资源]