高压喷射注浆挤压效应分析及应用研究  

Analysis and application research on the squeezing effect of high-pressure jet grouting

作　　者：钟贵荣 ZHONG Guirong(Fujian Academy of Building Research CO.,LTD,Fuzhou 350108)

机构地区：[1]福建省建筑科学研究院有限责任公司,福建福州350108

出　　处：《福建建筑》2024年第11期79-84,共6页Fujian Architecture & Construction

基　　金：福厦泉国家自主创新示范区协同创新平台项(35022CQX T202202);福建省对外合作科技计划项目(2022I0014);福建省建设科技项目(2022-K-143)。

摘　　要：高压喷射注浆挤压效应会对周边既有建构筑产生破坏作用,控制及利用高压喷射注浆挤压效应有重要意义。为此,结合工程实例,计算桥梁基桩纠偏加固过程中,高压喷射挤压效应形成的塑性区半径、径向应力增量和超孔隙水压力增量的解析解,研究高压喷射注浆挤压效应变化规律。计算结果表明,高压喷射注浆塑性区半径与注浆体面积置换率呈线性增加关系;在挤压弹性区范围,径向应力增量及超孔隙水压力增量,随着距离高压喷射中心点水平距离加大,均呈逐渐减小趋势,减小速率先快后慢;土层径向应力增量与超孔隙水压力增量,均与面积置换率呈线性增长关系;高压喷射注浆挤压效应主要集中于10倍设计喷射半径内。此外,用理论分析结果指导了桥梁基桩纠偏工程设计及施工,获得良好的效果。The squeezing effect of high-pressure jet grouting can cause damage to existing buildings in the surrounding area,and controlling and utilizing the squeezing effect of high-pressure jet grouting is of great significance.Therefor,based on engineering examples,the analytical solutions for the plastic zone radius,radial stress increment,and excess pore water pressure increment formed by high-pressure jet grouting compression effect during the correction and reinforcement process of bridge foundation piles were calculated,and the variation law of high-pressure jet grouting compression effect was studied.The calculation results show that the plastic zone radius of high-pressure jet grouting increases linearly with the displacement rate of the grouting body area;In the range of compression elastic zone,the radial stress increment and the excess pore water pressure increment gradually decrease with the increase of horizontal distance from the high-pressure injection center point,and the reduction rate is first fast and then slow;The radial stress increment and excess pore water pressure increment of the soil layer both exhibit a linear growth relationship with the area replacement rate;The squeezing effect of high-pressure jet grouting is mainly concentrated within 10 times the design jet radius.In addition,the theoretical analysis results were used to guide the design and construction of bridge foundation pile correction engineering,achieving good results.

关 键 词：高压喷射 挤压效应 径向应力 超孔隙水压力 桥梁基桩 纠偏加固 

分 类 号：U44[建筑科学—桥梁与隧道工程]