缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究

发布时间：2018-01-08 08:09

本文关键词：缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究　出处：《岩土力学》2015年02期 　论文类型：期刊论文

【摘要】：锁儿头滑坡是甘肃省舟曲县城附近、体积约72.85×106 m3的一个巨型老滑坡。20世纪70年代末滑坡开始复活,至今一直处于缓慢活动之中,显示滑坡活动具有典型的蠕动特点。滑带力学特性是控制滑坡活动机制的关键因素之一,为了弄清该滑坡滑带物质的蠕变性质以及控制滑坡活动的强度指标,通过滑带土残余状态下的直剪蠕变试验,研究了滑坡滑带土的蠕变特性,比较了滑带长期强度和残余强度的关系。研究发现,滑带土蠕变特性与应力状态相关,滑带进入加速蠕变的临界剪应力和剪切速率均与正应力线性正相关。该滑坡应力状态指示其已具备进入加速蠕变的条件。残余状态下该滑坡滑带土的长期与残余强度基本等价,前者略大于后者,且增大量值与正应力有负相关关系。
[Abstract]:Suo'ertou landslide is near the Gansu province Zhouqu County, a volume of about 72.85 * 106 m3 a giant old landslide.20 century began at the end of the 70s landslide resurrection, has been in a slow activity, that activity has the typical characteristics of the landslide creep sliding zone. The mechanical properties is one of the key factors to control the mechanism of landslide activities, in order to strength index to ascertain the landslide zone material creep properties and control of landslide activities, through the direct shear creep test of sliding soil residual state, studied the creep characteristics of landslide, compared with sliding relationship between long-term strength and residual strength. The study found that the stress state and related creep behavior of sliding zone, sliding zone enter the critical shear stress accelerated creep and shear rate and normal stress is linear positive correlation. The landslide stress state indicating has accelerated creep conditions. Under the condition of the residual into sliding slope The long-term slip and residual strength of the basic equivalence zone, the former is slightly larger than the latter, and add a large number of values and has negative correlation with the normal stress.

【作者单位】：中国地质大学(北京)水资源与环境学院;
【基金】：国家自然科学基金项目(No.41372305)
【分类号】：TU411
【正文快照】： 1引言滑带抗剪强度是控制滑坡稳定性和活动机制的关键指标。滑坡的稳定和活动状态与滑带土的5个特征强度密切相关:峰值强度、启动强度、完全软化强度、残余强度以及长期强度[1]。滑带土的峰值强度是应力-变形曲线上的最高点对应的抗剪强度值[1-2];启动强度是滑坡整体失稳启动

【参考文献】