富水环境下泥水盾构开挖面合理泥水压力研究  

Study on Reasonable Slurry Pressure of Excavation Face of Slurry Shield in Water-rich Environment

作　　者：汪琴 WANG Qin(Minnan University of Science and Technology,Shishi,Fujian 362700, China)

机构地区：[1]闽南理工学院

出　　处：《公路工程》2019年第5期151-155,共5页Highway Engineering

基　　金：福建省教育厅科研项目(JT180691);福建省高等学校杰出青年科研人才培育计划资助

摘　　要：为了研究富水环境下泥水盾构开挖面合理压力的取值,借助于GID软件和基于MATLAB的二次开发程序,对压力上限值与隧道埋深、直径、土体模量、土体粘聚力以及土体内摩擦角之间的关系进行了数值模拟研究。研究成果表明:土体在发生水力劈裂时,其产生的裂缝以竖向扩展为主,且裂缝的破坏形式最终呈漏斗形;土体表面破坏会加速中间主裂缝的扩展,但在主裂缝扩展到地表之前,其他方向的裂缝扩展速度很慢,这是因为其它裂缝尖端的泥水压力较小,不足以使裂缝出现扩展;泥水压力的上限值随着隧道埋深的增加呈现出非线性增长的趋势,随着土体粘聚力的增加呈现出线性增长的趋势,而土体模量、隧道直径以及内摩擦角这3个因素对压力上限值的影响很小。In order to study the reasonable pressure of excavation face of slurry shield under water-rich environment. With the aid of GID software and the secondary development program based on MATLAB,the relationship between the upper limit of pressure and the depth,diameter,modulus,cohesion and friction angle of the tunnel is numerically simulated. The research results show that when hydraulic fracturing occurs,the main cracks are vertical expansion,and the failure form of cracks is funnel-shaped.The failure of soil surface accelerates the expansion of intermediate main cracks,but before the main cracks extend to the surface,the cracks in other directions expand very slowly,because the mud pressure at the tip of other cracks is low,which is not enough to make the cracks expand. The upper limit value of slurry pressure shows a non-linear growth trend with the increase of tunnel burial depth,and a linear growth trend with the increase of soil cohesion. However,the three factors of soil modulus,tunnel diameter and internal friction angle have little influence on the upper limit of slurry pressure.

关 键 词：盾构隧道 泥水压力 掌子面稳定 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]