考虑圆孔扩散时盾构注浆引起的土体变形分析
Analysis of Soil Deformation Induced by Shield Grouting Considering the Cavity Diffusion
陈威 1孙兴鹏 2程钰博 2孙阳3
作者信息
- 1. 中国电建集团华东勘测设计研究院有限公司,杭州 311100
- 2. 河海大学 港口海岸与近海工程学院,南京 210098
- 3. 河海大学 港口海岸与近海工程学院,南京 210098;河海大学 淮安研究院,江苏 淮安 223001
- 折叠
摘要
本文基于弹性力学Mindlin基本解和坐标变换,假设盾尾注浆浆液为牛顿流体,考虑盾尾浆液在一定厚度范围内沿柱面均匀圆形扩散,得到注浆压力竖向分量和水平分量引起的土体竖向位移解,并以某工程盾构施工段为例,分别计算了注浆压力简化为均布荷载和考虑圆孔扩散的竖向位移.结果表明:2种方法计算得到的土体的位移曲线均呈现正态分布,距离注浆面越近,土体隆起变形就越大;考虑注浆压力圆孔扩散时,计算得到的地表隆起值约为均布注浆压力的3倍;考虑圆孔扩散的位移公式包含了注浆压力、注浆时间、注浆孔径和浆液特性等参数,通过调整这些参数能够改善盾尾注浆引起的土体变形.
Abstract
Based on the Mindlin fundamental solution of elasticity and coordinate transformation,assuming that syn-chronous grouting slurry at the shield tail is a Newtonian fluid,and considering the uniform circular diffusion of the grouting slurry in a certain thickness range along the cylindrical surface,the solution for the vertical displacement of the soil caused by the vertical and horizontal components of the grouting pressure is obtained.Taking the shield con-struction section of a project as an example,the vertical displacement caused by simplifying the grouting pressure to uniformly distributed load and the vertical displacement caused by the cavity diffusion are calculated,respectively.The analysis results show that:the displacement curves of the soil calculated by the two methods all present a normal distribution,and the closer to the grouting surface,the greater the upheaval of the soil;when considering the cavity diffusion of the grouting pressure,the calculated value of surface upheaval is about 3 times of the uniform grouting pressure;The displacement formula considering the cavity diffusion includes parameters such as grouting pressure,grouting time,grouting aperture and grout characteristics.By adjusting these parameters,the soil deformation caused by grouting at shield tail can be improved.
关键词
盾构施工/圆孔扩散/Mindlin解/注浆压力/土体变形Key words
shield construction/cavity diffusion/Mindlin solution/grouting pressure/soil deformation引用本文复制引用
基金项目
浙江省交通厅科技项目(2020014)
南通市科技计划(JC2021009)
出版年
2024
NETL
NSTL
万方数据