摘要
研究目的:通过建立三维有限元模型,对土压平衡式盾构隧道掘进的施工过程进行模拟,模拟中考虑了盾构机作用、盾尾空隙及注浆的影响、后方台车重量等因素,并采用了位移控制的求解方法。该计算模型可以用于探明地表或地中位移的大小和分布情况,以及地层移动随盾构机掘进的动态变化规律。研究结论:盾构掘进时地表沉降主要在盾构机前方1D到盾构机后方2D的范围内产生,随着埋深的增加,地层受盾构机的扰动也大。盾尾空隙的存在是造成地层移动的主要原因。盾构掘削面到达前,地表将沿着盾构机推进方向产生移动,该移动在盾构通过时受地层沉降的影响会先减小后增大,并在隧道建成后出现最终的最大值。
Research purposes： 3 D finite element model is built to simulate the construction course of earth - pressure - balance shield tunnel driving. The shield machine＇s action, the influence of void and grouting in the tail and trolley weight are considered in this model. The displacement control method is adopted for the solution. This model can be used for ascertaining the magnitude and distribution of the displacement on the surface or in the ground, and ground movement variation with shield tunnel driving. Research conclusions：Ground surface settlement happens within the range from 1D ahead the cutting face to 2D after the tail during the shield driving. The ground is disturbed more greatly with increasing of buried depth. The tail void of the shield is the major factor to induce the ground movement. Before the arrival of cutting face, ground will displace along with the driving direction. This displacement will decrease and then increase as the shield passing because of ground settlement, and becomes maximum after the completion of tunnel.
出处
《铁道工程学报》
EI
北大核心
2009年第11期56-60,共5页
Journal of Railway Engineering Society
关键词
平衡式
盾构隧道
施工进程
数值分析
balance
shield tunnel
construction course
numerical analysis
