某铁路弃渣场滑坡成因分析及整治方案研究

Cause Analysis and Treatment Scheme of Landslide in a Certain Railway Concentrated Spoil Bank

为查明某高速铁路隧道弃渣场的滑移原因,制定安全、合理的整治措施,对滑坡体进行了补勘,并对弃渣场边界桩进行了位移观测,得出弃渣场滑移的主要原因为:①弃渣堆载过于集中、且高度过高;②连续集中的降雨使弃渣体的饱和度大幅提高,附加荷载增大,土体的物理力学指标降低;③未及时施作排水设施。利用Slide软件建模,并选用摩根斯顿-普赖斯法对弃渣场的稳定性进行分析。研究表明,弃渣场设计中应重视排水设施的作用;弃渣堆积的控制高度应考虑充水饱和的不利影响;采用抗滑桩治理弃渣体滑移时,应根据滑坡情况布设抗滑桩;结合弃渣场的实际情况,给出了三排抗滑桩的支挡方案。

In order to find root cause of landslide in one concentrated spoil bank of high-speed railway tunnel and implement a series of safe and reasonable remediation, measures have been established in course of supplementary geological prospecting work upon landslide body accordingly. Additionally, a series of displacement observations have been implemented for boundary piles of concentrated spoil bank. It turns out that the main reasons causing landslide are as follows. Firstly, load of spoil bank is too concentrated and height of that is too high. Secondly, continuous concentrated rainfalls have greatly increased saturation degree and additional load of abandoned slag body, as well as reduced physical and mechanical indexes of soil. Thirdly, no drainage facility has been applied in a timely manner. While using Slide software to establish model, the Morgenstern-Price method is selected to make analysis on stability of concentrated spoil bank. It shows, in course of designing concentrated spoil bank, functions of drainage facilities shall be mainly considered. And when setting actual controlled height of abandoned slag body, subsequent adverse effect of water saturation should be jointly considered. And while using anti-slide piles to control landslide, anti-slide piles should be laid according to actual landslide situation. Combined with actual situation of concentrated spoil bank, this paper also proposes a supporting scheme with adoption of three rows of anti-slide piles.