低弹模混凝土受压破坏型式试验研究  

Experimental Study on Compressive Failure Type of Low Elastic Modulus Concrete

作　　者：郑敏生[1] 马晓华[1,2] 苏玉杰[1] 梁国钱[1] 

机构地区：[1]浙江省水利河口研究院浙江省水利防灾减灾重点实验室,浙江杭州310020 [2]浙江绩丰岩土技术股份有限公司,浙江杭州310013

出　　处：《人民黄河》2013年第9期111-113,共3页Yellow River

基　　金：浙江省重大科技专项(2008C13040-2);浙江省重大水利科技计划项目(RA0901)

摘　　要：为了检验土石坝中低弹模混凝土防渗墙采用第一强度理论设计的适宜性,通过三轴试验机施加不同的围压对低弹模混凝土进行压缩破坏型式试验研究。研究表明:低弹模混凝土单轴抗压破坏型式为压碎型,符合第一强度理论;施加一定围压后抗压破坏型式为剪切型,符合摩尔-库仑强度理论。在土石坝工程中,由于防渗墙两侧存在土体的侧压力作用,因此对低弹模混凝土防渗墙采用摩尔-库仑强度准则进行设计更加符合实际工程情况,但采用第一强度理论进行设计,其极限强度会低于实际的承载力,对工程来说是偏于安全的,同样也是适宜的。In order to examine the applicability of the first strength theory being used to the design of the low elastic modulus concrete cut-off wall in earth-rockfill dam, the compressive failure test of low elastic modulus concrete under confining pressure imposed by triaxial testing machine were carried out in Ibis paper. The result shows that the uniaxial compressive failure of low elastic modulus concrete is crushing failure, which conforms to the first strength theory. Besides, being pressed by a certain pressure, the compressive failure is shear failure and satisfies the More-Coulomb strength theory. Thus, in the design of low elastic modulus concrete cut-off wall under lateral pressure of the soil, the More-Coulomb strength theory is more close to the practical engineering than the first strength theory. When designing by the first strength theory, the ultimate strength of the low elastic modulus concrete is ｜ower than the actual bearing capacity and it is safe for engineering.

关 键 词：水工材料 破坏型式 三轴压缩试验 低弹模混凝土 土石坝 

分 类 号：TV543[水利工程—水利水电工程]