MJS工法与高压旋喷桩(双重管)挤土效应对比试验研究  

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

作　　者：毛祖夏 杨兰强 李佳明 MAO Zuxia;YANG Lanqiang;LI Jiaming(Ningbo Yincheng Group Co.,Ltd.,Ningbo 315010,Zhejiang,China;Ningbo Urban Construction Design&Research Institute Co.,Ltd.,Ningbo 315000,Zhejiang,China)

机构地区：[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　　处：《隧道建设（中英文）》2021年第10期1699-1707,共9页Tunnel Construction

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:1)MJS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1.33。3)MJS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。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 high-pressure 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 high-pressure 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 high-pressure 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 high-pressure jet grouting pile construction gradually decrease with an increase in horizontal distance.

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 

分 类 号：U45[建筑科学—桥梁与隧道工程]