CAJ | 학술논문

为探讨顶管法施工时造成的土体扰动，以合肥市某顶管工程为背景，运用理论分析与数值模拟相结合的方法对施工时的地层应力场、位移场及地表隆沉的变化过程和分布规律进行了研究并对地表位移进行了监测。结果表明，顶管施工时管道周围一定范围内的土体会受到扰动，管道底部、腰部分别出现最大竖向拉应力、最大竖向压应力；管道上方的土体扰动区域大于下方土体，管道底部和顶部位置土体分别出现最大隆起和最大沉降，随着管道的顶进隆起值减小而沉降值增大，管道轴线远处土体的位移基本为零；地表隆沉曲线以管道轴线为对称轴近似正态分布，在掌子面前方地层表现为隆起而后方为沉降状态。
위탐토정관법시공시조성적토체우동，이합비시모정관공정위배경，운용이론분석여수치모의상결합적방법대시공시적지층응력장、위이장급지표륭침적변화과정화분포규률진행료연구병대지표위이진행료감측。결과표명，정관시공시관도주위일정범위내적토체회수도우동，관도저부、요부분별출현최대수향랍응력、최대수향압응력；관도상방적토체우동구역대우하방토체，관도저부화정부위치토체분별출현최대륭기화최대침강，수착관도적정진륭기치감소이침강치증대，관도축선원처토체적위이기본위령；지표륭침곡선이관도축선위대칭축근사정태분포，재장자면전방지층표현위륭기이후방위침강상태。
In order to investigate the soil disturbance caused by the pipe jacking construction, the soil stress-displace-ment field and surface deformation during construction were studied with theoretical and numerical simulation methods based on a pipe-jacking project in Hefei and the surface displacement was monitored. The results show that the soil is dis-turbed in a certain range around the pipe while the pipe jacking, the maximum vertical tensile stress and the maximum vertical compressive stress are in the bottom and the middle of the pipe respectively; the disturbance area above the pipe is bigger than that of the below. The maximum uplift an settlement are in the top and the bottom respectively, the upheaval decreases while the settlement increases with the pipe jacking, the displacement of soil far from the pipe axis is about zero;the surface deformation curves is approximate a normal distribution whose symmetry axis is the axis of the pipe, the soil layer uplifts in front of tunnel face, then settles behind it.