安全与环境工程

在新疆塔什库尔干塔吉克自治县(简称塔县)内,沿塔什库尔干河分布着众多大型岩质滑坡,均为地震触发的沿顺倾结构面失稳滑动的顺向坡,揭示它们的失稳破坏机理,对塔县境内众多顺向坡的稳定性评价具有重要的实际意义。以塔县一典型顺向岩质滑坡为例,在大量现场调查的基础上,获取了岩质滑坡的工程地质条件和基本特征,建立了岩质滑坡三维地质模型,并采用离散元数值软件模拟了岩质滑坡在不同加速度地震力作用下的变形与破坏过程。结果表明:原始滑坡的稳定性主要受地震力和顺向结构面的控制;当地震力较小时,滑坡坡体未发生变形破坏,但其有沿着结构面错动的趋势;随着地震力的增加,坡体沿着结构面错动的趋势愈发明显;当地震力增加到某一临界值时,坡体沿着结构面形成贯通性破坏面,坡体发生失稳破坏。该研究结果可为塔县以及其他地震高烈度区岩质滑坡的稳定性评价提供依据。

In Tashkurgan Tajik Autonomous County(Taxian for short) of Xinjiang, there are many large rockslides along the Tashkurgan River, all of which are earthquake-triggered bedding slopes of unstable sliding along the consequent structural plane.Revealing the instability failure mechanism has important practical significance for the stability evaluation of many bedding slopes in Taxian.This paper takes a typical consequent rock landslide in Taxian as example, on the basis of a large number of field investigations, obtains the engineering geological conditions and basic characteristics of the rock slope, establishes a three-dimensional geological model, and uses a discrete element numerical software to simulate the deformation and failure process of the slope under the action of different acceleration seismic forces.The results show that the stability of the original slope is mainly controlled by seismic force and structural plane.When the seismic force is small, the slope has no deformation and failure, but has the tendency of dislocation along the structural plane.With the increase of seismic force, the trend of slope dislocation along the structural plane becomes more and more obvious.When the seismic force increases to a certain critical value, a penetrating sliding surface along the structural surface is formed, and the slope is unstable and damaged.The conclusion of this study provides basis for the stability evaluation of the rocky slopes in Taxian and other high-intensity areas.