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一、概述以注浆土层锚杆代替内支撑维持板桩挡墙的稳定已成为深基坑开挖的发展趋势。因为以锚定板桩围护的基坑,提供了开阔作业面,便于采用大机械连续出士,改善了工人工作条件,提高劳动生产率。因此,用土锚挡墙支撑基坑边坡,对于场地窄小的市区建设工程,具有很大的吸引力。但到目前为止,用斜土锚支撑基坑边坡多用于砂砾地层和硬粘土地层中,在饱和软地层中尚无应用先例。近年来,上海各单位相续开始了开发性试验研究。本文介绍同济大学与基础公司共同进行的试验及应用成果。本文资料以下列三个试验为基础: 1.国康路斜士锚承载能力现场试验; 2.爱建公寓4号楼基坑土锚挡墙应用试
I. Overview The use of grouting earth-layer anchors instead of internal supports to maintain the stability of sheet pile retaining walls has become a development trend for deep excavation. Because the foundation pits encircled by anchored sheet piles provide an open work surface, it is easy to use large machinery for continuous delivery, improve working conditions for workers, and increase labor productivity. Therefore, the use of earth-anchor retaining walls to support the foundation pit slope has great attraction for urban construction projects with narrow sites. But so far, slopes supported by inclined anchors are mostly used in gravel formations and hard clay formations, and there are no precedents in saturated soft formations. In recent years, various units in Shanghai have started developmental experiments. This article describes the results of experiments and applications jointly conducted by Tongji University and basic companies. The information in this paper is based on the following three tests: 1. On-site test of load bearing capacity of oblique anchors on Guokang Road; 2. Application of soil retaining wall for foundation pit of No. 4 Building in Aijing Apartment.