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青藏高原多年冻土区发育的两类低角度滑坡——融冻泥流和热融滑塌是冻融循环条件下特殊的斜坡失稳类型,在广大的非冻土地区一般很难见到这种低角度的滑坡类型。探讨了两类低角度滑坡灾害的形成机理,即质点迁移效应和滞水润滑效应。以摩尔-库仑强度准则为理论基础,应用所推导的沿坡面平行方向渗流条件下安全系数的统一形式,对青藏公路k3035里程热融滑塌体稳定性进行了分析评价,验证了活动层沿厚层地下冰面滑动的“滞水润滑效应”。从环境工程地质学的观点出发,针对热融滑塌这种可控的滑坡地质灾害,提出了基于保护冻土原则的具体的防治措施。
Two types of low-angle landslides developed in the permafrost region of the Qinghai-Tibet Plateau - thawing slides and thermal slump are special types of slope instability under freeze-thaw cycling and are generally difficult to see in a wide range of non-permafrost regions A low-profile landslide type. The formation mechanism of two kinds of low-angle landslide hazards is discussed, that is, particle migration effect and stagnant water lubrication effect. Based on the Mohr Coulomb strength criterion, the stability of the thermal slump in the k3035 mileage of Qinghai-Tibet Highway was analyzed and evaluated by applying the unified form of the safety factor for seepage along the parallel direction of the slope. The “stagnant water lubrication effect” of thick ice under ground. From the point of view of environmental engineering geology, aiming at the controllable landslide geological disaster such as thermal slump, a specific control measure based on the principle of protecting frozen soil was proposed.