重力坝与砂砾石坝变形模型试验对比分析  

Comparative Analysis of Deformation Model Tests of Gravity Dam and Sand Gravel Dam

作　　者：王广宇 WANG Guang-yu(Chaoyang Tianhao Water Conservancy Construction Co.Ltd.,Chaoyang 122000,Liaoning,China)

机构地区：[1]朝阳天浩水利建筑有限公司,辽宁朝阳122000

出　　处：《水利科技与经济》2023年第5期17-21,共5页Water Conservancy Science and Technology and Economy

摘　　要：CSG坝作为新兴坝型,具有施工速度快、承载力强、工程成本低等优点。为了对比CSG坝和重力坝在复杂地基上的稳定性和安全性,以实际大坝为原型,建立地质力学试验模型,对比分析相同超载倍数和地基条件下的重力坝和CSG坝的安全度和稳定性。结果表明,从整体来看,受压为重力坝和CSG坝的主要受力状态,两者的应变分布规律大致相同,都有朝向下游的变位,且在超载倍数不断提高时,均存在小幅度扭转;当地基存在软弱结构面时,重力坝模型和CSG坝模型最后测出的Kp超载安全度分别为3.0和6.4,表明当规模相同时CSG坝有着更好的深层抗滑稳定性;在超载倍数和相同地基条件下,经过计算得出重力坝和CSG坝的安全度分别为2.5和6.0,与模型所得结果大致相同,且经过加载重力坝破坏程度明显高于CSG坝,表明CSG坝具有更好的承载能力,安全性更高。As a new dam type,CSG dam has the advantages of fast construction speed,strong bearing capacity and low engineering cost.In order to compare the stability and safety of the CSG dam and the gravity dam on the complex foundation,a geomechanical test model is established based on the actual dam as the prototype,and the safety and stability of the gravity dam and the CSG dam under the same overload multiple and foundation conditions are compared and analyzed.The research results show that as a whole,compression is the main stress state of the gravity dam and the CSG dam,and the strain distribution laws of both are roughly the same,with displacement towards the downstream,and when the overload times increase continuously,there is small torsion.When there is a weak structural plane in the foundation,the Kp overload safety degrees measured by the gravity dam model and the CSG dam model are 3.0 and 6.4 respectively,indicating that the CSG dam has better deep anti sliding stability when the scale is the same;under the overload multiple and the same foundation conditions,the safety degree of gravity dam and CSG dam can be calculated to be 2.5 and 6.0 respectively,which is roughly the same as the results obtained by the model,and the damage degree of the loaded gravity dam is significantly higher than that of CSG dam,indicating that CSG dam has better bearing capacity and higher safety.

关 键 词：CSG坝 复杂地基 超载倍数 重力坝 

分 类 号：TV641[水利工程—水利水电工程]