考虑渗流作用的闸坝深层抗滑稳定性分析  

The Deep Anti-sliding Stability Analysis of Gate Dam on the Condition of Seepage Infiltration

作　　者：胡怿兴 HU Yi-xing(Hunan Water Resources and Hydropower Survey,Design,Planning and Research Co.,Ltd.,Changsha 410007,Hunan Province,China)

机构地区：[1]湖南省水利水电勘测设计规划研究总院有限公司,湖南长沙410007

出　　处：《中国农村水利水电》2023年第8期205-208,216,共5页China Rural Water and Hydropower

摘　　要：闸坝的基础中往往不可避免地分布着一些不利的节理、裂隙和软弱结构面,应进行结构沿软弱结构面的深层抗滑稳定计算。结构在挡水时上下游存在水头差,混凝土结构往往作为不透水材料考虑,基础承担了绝大部分的水头损失,其渗流作用不可忽略。在有限元强度折减法的基础上,通过渗透场力分解为渗透体积力和浮托力,研究了渗流作用下,闸坝在有无帷幕灌浆影响下的深层抗滑稳定性,结果表明:基础帷幕灌浆可有效截断渗流,显著提高闸坝结构深层抗滑稳定性;渗透作用对结构深层抗滑稳定性影响方面,同时考虑渗透体积力和浮托力>仅考虑浮托力>仅考虑渗透体积力,浮托力起主导作用,但是渗透体积力的作用不可忽视。The deep anti-sliding stability calculation of the structure should be carried out in the case of unexpected joints,fissures and weak structural planes in the foundation of the gate dam.There is a head difference between the upstream and downstream of the structure.The concrete is usually considered as an impermeable material.The foundation bears most of the head loss,and its seepage effect cannot be ignored.In this paper,the seepage field force is divided into seepage volume force and buoyancy force.And based on the strength reduction method of finite element method,the deep anti-sliding stability of the gate dam under seepage is studied with the body force of seepage.The results show that the foundation curtain grouting can effectively cut off the seepage and significantly improve the deep anti-sliding stability of the gate dam structure.And in terms of the safety factor,consider the seepage volume force alone>consider the buoyancy force alone>consider the seepage volume force and buoyancy force at the same time.The buoyancy force plays a leading role,but the role of the seepage volume force cannot be ignored.

关 键 词：深层抗滑 渗透场力 渗透体积力 浮托力 强度折减法 

分 类 号：TV223[水利工程—水工结构工程]