预应力锚索桩在某岩质滑坡治理中的应用

The Application of Prestressed Anchor Cable Anti-slide Pile in a Rocky Landslide Governance

预应力锚索桩是由预应力锚索和抗滑桩所组成的支挡体系,在桩的顶部设置预应力锚索,改变了抗滑桩单纯靠桩侧向地基反力抵抗滑坡的推力机理,使得桩顶变形受到了极大的约束,从而改善了滑面以上桩的受力及变形状态,以达到减小桩截面及桩长的目的。以兴县某煤矿工业场地内的岩质滑坡治理工程为实例,采用预应力锚索桩作为主要的阻滑措施,锚索桩按照"横向变形约束地基系数法"进行设计计算。

The prestressed anchor cable anti-slide pile is a retaining system composed of prestressed anchor cable and anti-slide pile. Setting the prestressed anchor cable on the top of pile can change the thrust mechanism of that the anti-slide pile resists the landslide relying only on pile’s lateral foundation counterforce, which makes the deformation of pile top be greatly constrained, thus improves the stress and deformation state of the pile above the sliding surface, and achieves the aim of of reducing pile length and pile section. Taking the rocky landslide treatment engineering of a coal mine’s industrial site in Xingxian County as an example, this paper adopts the prestressed anchor cable anti-slide pile as the main anti-slide measure, and carries out the calculation and design of the anchor cable according to the lateral deformation constraints’ foundation coefficient method.