顶管穿越大厚度液化层处理措施研究  

作　　者：田兴未 

机构地区：[1]中铁第六勘察设计院集团有限公司,天津300000

出　　处：《科技创新与应用》2024年第24期150-154,共5页Technology Innovation and Application

摘　　要：土体液化是指在外力作用下,饱和状态的砂土或粉土中土体颗粒之间发生相对位移,颗粒间的孔隙水来不及排泄,孔隙水压力短时间内急剧上升,当孔隙水压力上升到与土颗粒所受到总的正压力接近时,土颗粒之间因摩擦产生的抗剪力接近零,使土粒在孔隙水中悬浮,土层颗粒的承载力顿时会被水给取代,土体结构内部会变成像液体一样可以流动的现象。液化现象能造成场地的整体性失稳,危害极大,已引起国内外工程界的普遍重视,成为工程抗震设计的重要内容之一。目前国内针对顶管穿越大厚度液化层研究较少,该文以太原地区某出入口为例,分析和总结相关液化处理措施,可为类似的顶管工程提供借鉴参考。Soil liquefaction means that under the action of external force,relative displacement occurs between soil particles in saturated sand or silt,pore water between particles is too late to discharge,and pore water pressure increases sharply in a short time.When the pore water pressure rises close to the total positive pressure of soil particles,the anti-shear force caused by friction between soil particles is close to zero,making the soil particles suspended in pore water.The bearing capacity of soil particles will immediately be replaced by water,and the interior of the soil structure will flow like a liquid.The liquefaction phenomenon can cause the overall instability of the site and do great harm,which has attracted the attention of the engineering circles at home and abroad,and has become one of the important contents of engineering seismic design.At present,there is little research on pipe jacking through large thickness liquefaction layer in China.Taking an entrance in Taiyuan area as an example,this paper analyzes and summarizes the relevant liquefaction treatment measures,which can provide reference for similar pipe jacking projects.

关 键 词：顶管 液化层 出入口 水平注浆 处理措施 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]