松散沙层复合土钉支护作用机制的实例分析

复合土钉支护是土钉与预应力锚杆(索)、搅拌桩(止水帷幕)、微型钢管桩等支护形式中的一种或几种加固支护型式相结合而成.但整体作用机理并非各部分支护的简单叠加.本文主要结合一个复合土钉支护工程实例,来分析复合土钉支护中各部分支护形式所起的作用及计算原理.土钉是主要的受力结构;预应力锚杆可抵消掉一部分土压力,有效减少支护土体上部的水平位移;搅拌桩主要起止水帷幕作用,同时有利于坑底的抗隆起作用;微型桩能起到增强坑壁刚度的作用,减少坑顶水平位移和沉降.

Working Mechanical Analysis of a Composite Soil Nailing Support Example

Composite soil nailing support consists of soil nailing, anchored-bolt, mixing pile and mini-type pile. But the whole working mechanics is not merely the adding of each part. In this paper, an example of composite soil nailing support is introduced, and the respective working mechanism of each part of it is analyzed. Soil nailing is the main resistance structure; anchored-bolt counteracts some parts of earth pressure, and effectively reduces horizontal displacement of upper soil body; mixing pile mainly works as water proof curtain, and conduces to withstanding of heave of base; mini-type pile can enhance the rigidity of foundation pit wall, and reduce horizontal displacement and settlement of upper soil body.