真空预压的环境效应及其防治方法的试验研究

›› 2008, Vol. 29 ›› Issue (4): 1093-1096.

真空预压的环境效应及其防治方法的试验研究

金小荣^{1, 2}，俞建霖²，龚晓南²

1. 浙江大学建筑设计研究院岩土工程分院，杭州 310012；2. 浙江大学岩土工程研究所，杭州 310027

收稿日期:2006-07-04 出版日期:2008-04-10 发布日期:2013-07-10
作者简介:金小荣，男，1977年生，博士，主要从事地基处理工程和基坑工程方面的研究

Study on environmental effect induced by vacuum preloading and its control method

JIN Xiao-rong¹, YU Jian-lin², GONG Xiao-nan²

1. Architectural Design and Research Institute, Zhejiang University, Hangzhou 310012, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China

Received:2006-07-04 Online:2008-04-10 Published:2013-07-10

摘要/Abstract

摘要： 真空预压极有可能引发相邻建（构）筑物倾斜、开裂、地下管线变形等环境效应。从加固区外地下水位、侧向变形和地表沉降变化看，真空联合堆载预压试验的影响区为地基处理边线外12.5 m。分别研究了采用水泥搅拌桩隔离、开挖应力释放沟和采用树根桩托换技术三类防治方法对减小周围土体变形的作用。现场测试结果表明：土体向内侧向变形主要发生在地表下6 m；水泥搅拌桩外侧最大土体水平位移仅为内侧的1/3，堆载后外侧位移远小于内侧位移；应力释放沟内侧最大水平位移仅为搅拌桩内侧水平位移的3/10，外侧最大水平位移仅为搅拌桩外侧位移的3/8。试验中真空预压阶段对于减小侧向变形而言，应力释放沟的作用要优于水泥搅拌桩，而堆载后应力释放沟深部土体向外挤出较为明显；树根桩托换后的铁塔基础在抽真空过程中沉降很小。

关键词: 真空预压, 环境效应, 防治方法, 应力释放沟

Abstract: Vacuum preloading may endanger the surrounding buildings and buried pipes. From the variation of water table, lateral displacement and settlement out of the reinforcing area, the influence range of vacuum-surcharge preloading is 12.5 m outside the edge of treated area. To reduce the deformation of surrounding soil, three different control methods such as cement mixed piles wall, stress release trench and underpinned root piles are studied experimentally. Inward lateral displacements chiefly occur at 6 m below the ground. The maximum lateral displacements outside the cement mixed piles wall are 1/3 of the inside one and after loading the outside deformation is far less than the inside one. The maximum lateral displacements inside the stress release trench are 3/10 of those inside the piles; and the maximum lateral displacements outside the trench are 3/8 of those outside the piles. As far as reducing the lateral displacements at vacuum preloading stage in this experiment, the stress release trench is much better than the cement mixed piles wall; but at the vacuum-surcharge preloading stage, outward displacement of the deep subsoil near the trench is much more obvious. The settlement of underpinned foundation of iron tower by root piles is very small.

Key words: vacuum preloading, environmental effect, control method, stress release trench

中图分类号:

TU 472

金小荣，俞建霖，龚晓南 . 真空预压的环境效应及其防治方法的试验研究[J]. , 2008, 29(4): 1093-1096.

JIN Xiao-rong , YU Jian-lin , GONG Xiao-nan . Study on environmental effect induced by vacuum preloading and its control method[J]. , 2008, 29(4): 1093-1096.

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