层间错动带破坏模式及其剪切蠕变试验研究  

Experimental Study on the Damage Mode and Shearing Creep of Interlayer Dislocation Zone

作　　者：施秀山 杨海洋 SHI Xiu-shan;YANG Hai-yang(Honghe Prefecture Local Highway Management Office,Mengzi 651100,China;Honghe Hongfa Transportation Investment Co.,Ltd.,Mengzi 651100,China)

机构地区：[1]红河州地方公路管理处,蒙自651100 [2]红河红发交通投资有限公司,蒙自651100

出　　处：《价值工程》2022年第18期118-120,共3页Value Engineering

摘　　要：层间错动带是一种结构疏松、性状较差的软弱结构面,其剪切蠕变特性常诱发各类边坡失稳。因此,本文基于岩体稳定性控制理论,将层间错动带破坏模式分为拉裂、掉块及层间剪切滑移破坏3类,并采用剪切蠕变试验研究了试样的蠕变特性。结果表明,层间错动带具有明显的蠕变特性,试样的蠕变全过程曲线呈现阶梯式上升趋势。在剪应力作用下,土体经历了瞬时、衰减、稳态及加速变形阶段,蠕变速率最终出现激增现象,曲线呈“U”型。The interlayer dislocation zone is a kind of weak structural surface with loose structure and poor properties,and its shear creep characteristics often induce all kinds of slope instability.Therefore,based on rock stability control theory,this paper classifies the damage modes of interlaminar misalignment zone into three categories:pulling crack,falling block and interlaminar shear slip damage,and investigates the creep characteristics of the specimens by shear creep test.The results show that the interlayer dislocation zone has obvious creep characteristics,and the creep curve of the specimen shows a stepped up trend.Under the action of shear stress,the soil undergoes transient,decay,steady state and accelerated deformation stages,and the creep rate finally appears to surge,and the curve is"U"shaped.

关 键 词：层间错动带 破坏模式 蠕变过程 蠕变特性 

分 类 号：TU443[建筑科学—岩土工程]