风化料掺砾作为高坝心墙防渗体的原位力学性试验研究  

Study on in-situ mechanical property test of weathered rock with gravel used as the anti-seepage body of high dam core wall

作　　者：保华富[1] 王轶奂[1] 沈蓉[1] 张永全[1] 谢正明[1] 

机构地区：[1]中国水电顾问集团昆明勘测设计研究院,云南昆明650051

出　　处：《云南水电技术》2010年第1期58-62,共5页

摘　　要：结合糯扎渡水电站高坝心墙防渗料现场碾压试验，进行了现场原位载荷及大型直剪试验研究，风化料及掺砾风化料的承载力及变形模量均较高，承载力基本值大于430kpa，对应的变形模量大于24MPa，两种土料压实后均为低压缩性。其剪应力～剪位移曲线具典型应变硬化型塑性破坏特征，强度较高。风化料掺砾后，大5mm砾石含量有明显增加，其压缩性及抗剪强度得到进一步改善，有利于降低大坝建成蓄水后心墙的变形量，达到与主堆石体的协调变形作用。Based on the field compaction test of anti-seepage material for the high dam core wall of Nuozhadu Hydropower Station, the study on in-situ load and large direct shear test has been carried out. The bearing capacity and deformation modulus of the weathered rock and the weathered rock with gravel are very high. The basic value of bearing capacity is more than 430Kpa, and the corresponding deformation modulus is more than 24Mpa. The two kinds of soil have a low compression after being compacted. The curve of shear force to shear displacement is featured by typical strain against indurated plastic failure and high strength. After the weathered rock is mixed with gravel, the content of gravels which are larger than 5ram is obviously increased, and compressibility and shearing strength of the weathered rock are further improved, so as to reduce the deformation of core wall after the dam is put into operation, and achieve deformation compatibility with the main rockfill.

关 键 词：原位试验 风化料及掺砾风化料 工程特性 糯扎渡水电站 

分 类 号：TV641.1[水利工程—水利水电工程]