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隧道建设(中英文) ›› 2021, Vol. 41 ›› Issue (10): 1699-1707.DOI: 10.3973/j.issn.2096-4498.2021.10.009

• 研究与探索 • 上一篇    下一篇

MJS工法与高压旋喷桩(双重管)挤土效应对比试验研究

毛祖夏1, 杨兰强2, *, 李佳明2   

  1. (1. 宁波市鄞城集团有限责任公司, 浙江 宁波 315010 2. 宁波市城建设计研究院有限公司, 浙江 宁波 315000)
  • 出版日期:2021-10-20 发布日期:2021-11-04
  • 作者简介:毛祖夏(1968—),男,江苏苏州人,1990年毕业于苏州城建环保学院,城镇建设专业,本科,高级工程师,主要从事工程现场施工管理工作。E-mail:1742939024@qq.com。*通信作者: 杨兰强, E-mail: 444899040@qq.com。

Experimental Study on Compaction Effect between Metro Jet System Method and High-Pressure Jet Grouting Pile (DoubleTube)

MAO Zuxia1, YANG Lanqiang2, *, LI Jiaming2   

  1. (1. Ningbo Yincheng Group Co., Ltd., Ningbo 315010, Zhejiang, China; 2. Ningbo Urban Construction Design & Research Institute Co., Ltd., Ningbo 315000, Zhejiang, China)
  • Online:2021-10-20 Published:2021-11-04

摘要:

为研究MJS工法和高压旋喷桩(双重管)在软土地区对周边环境影响的异同,反映二者的挤土效应差异,通过现场试桩试验,分别实时采集MJS工法和高压旋喷桩施工期间的土压力、孔隙水压力、深层土体位移等数据。研究表明: 1MJS工法和高压旋喷桩在施工期间均表现出不同程度的挤土效应,但MJS工法表现出的挤土效应基本可以忽略不计。2)高压旋喷桩施工引起的最大土压力及最大孔隙水压力均大于MJS工法施工引起的土压力和孔隙水压力,高压旋喷桩最大压力值与MJS工法最大压力值之比均大于2.00,高压旋喷桩最大孔隙水压力值与MJS工法最大孔隙水压力值之比均大于1.333MJS工法施工引起的土体水平位移明显小于普通高压旋喷桩施工;MJS工法和高压旋喷桩均表现出表层水平位移较大,而随着深度增大,土体水平位移逐渐减少的特点。4)随着水平距离逐渐增大,MJS工法和高压旋喷桩施工引起的同深度土压力、孔隙水压力均逐渐减小。

关键词: 高压旋喷桩, MJS工法, 挤土效应, 土压力, 孔隙水压力, 深层土体位移

Abstract:

The data of earth pressure, pore water pressure, and deep soil displacement during metro jet system (MJS) method and highpressure jet grouting pile construction are collected in real-time via field pile to study the differences between the influences of the MJS method and high-pressure jet grouting pile (double-tube) on the surrounding environment in soft soil area, and reflect the difference of the compaction effect between them. The results show the following: (1) Both the MJS method and highpressure jet grouting pile show different degrees of compaction effect during construction; however, the compaction effect of the MJS method can be ignored. (2) The maximum earth pressure and pore water pressure induced by highpressure jet grouting pile construction are greater than those induced by the MJS method; the ratios of maximum pressure value and maximum pore water pressure between the highpressure jet grouting pile and MJS method are greater than 2.00 and 1.33, respectively. (3) The soil horizontal displacement due to MJS construction is smaller than that caused by ordinary high-pressure jet grouting pile construction; the horizontal displacement of the surface layer is larger in the MJS construction method and high-pressure jet grouting pile, whereas the soil horizontal displacement gradually decreases with an increase in depth. (4) The soil and pore water pressures at the same depth due to MJS construction and highpressure jet grouting pile construction gradually decrease with an increase in horizontal distance.

Key words:  , high-pressure jet grouting pile, metro jet system method, compaction effect, earth pressure, pore water pressure, deep soil displacement

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