堆石坝面防渗膜-垫层料界面力学特性试验研究  

Experimental Study of Mechanical Properties of Interfaces between Geomembrane Applied to Rockfill Dam and Cushion Materials

作　　者：蒋善平[1] 束一鸣[1] 吴海民[1] 滕兆明 蔚成亮 任泽栋[1] 

机构地区：[1]河海大学水利水电学院,南京210098 [2]昆山市淀山湖防洪工程管理处,江苏昆山215345

出　　处：《三峡大学学报（自然科学版）》2014年第1期10-14,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(51079047;51379069);水利部公益性项目(201201039)

摘　　要：堆石坝面防渗土工膜与垫层料界面的力学特性关系到防渗体的抗滑稳定性以及整个大坝的安全性.采用土工合成材料界面直剪拉拔仪分别对复合膜和HDPE纯膜与无砂混凝土及聚合物透水混凝土两种垫层料、加糙PVC膜与表面复合细骨料聚合物透水混凝土的界面力学特性进行了试验研究.试验结果表明:HDPE纯膜与两种垫层界面的剪应力-剪位移关系具有不同程度的应变软化特征,界面峰值强度高于残余强度;而复合膜与两种垫层界面的剪应力-剪切位移关系无明显软化现象;复合土工膜与两种垫层界面抗剪强度高于纯膜与两种垫层界面的抗剪强度;聚合物透水混凝土和无砂混凝土与复合膜界面抗剪强度差别不大,聚合物透水混凝土界面抗剪强度略低;糙面PVC膜与表面为细骨料聚合物透水混凝土的咬合力较大.The mechanical properties of interface between geomembrane used to control seepage in rockfill dams and cushion layer are related to the stability of impervious body and the security of the entire dam. By u- sing geosynthetics interface direct shear-pullout apparatus, the interface characteristics between two geomem- brane including composite geomembrane and HDPE and two kinds of cushion materials including porous con- crete and polymer concrete and that between reinforced PVC and polyurethane concrete are studied. The re- sults show that. the shear stress - shear displacement relationship of the interface between HDPE and two kinds of cushion layers have different degree strain softening characteristics that the peak strength of interface is higher than the residual strength of it~ while there is no obvious strain softening phenomenon occurred in the shear stress-shear displacement relationship of the interface between composite geomembrane and two kinds of cushion layers. The shear strength of the interface between composite geomembrane and two kinds of cushion layers is higher than that of the interface between HDPE and two kinds of cushion layers. The shear strength of the interface between polymer concrete and composite geomembrane is similar with that of the in- terface between porous concrete and composite geomembrane. The shear strength of the interface between polymer concrete and composite geomembrane is a little lower. The cohesion of reinforced PVC and polymer concrete whose surface is fine aggregate is larger.

关 键 词：土工膜 垫层 界面力学特性 剪应力-剪位移 抗剪强度 

分 类 号：TV441[水利工程—水工结构工程]