土工基础

›› 2015, Vol. 29 ›› Issue (5): 42-45.

• 工程实录 • 上一篇    下一篇

下伏采空区隧道整体稳定性的三维有限元数值模拟分析

李森林1,马博恒1,葛玉祥1,许范强1,罗柏党2   

  1. （1.中勘冶金勘察设计研究院有限责任公司，河北 保定 071069；2.河北钢铁集团矿业公司龙烟矿山分公司，河北 宣化 075100）
  • 收稿日期:2014-11-11 出版日期:2015-10-20 发布日期:2015-11-06
  • 作者简介:李森林（1982-），男，硕士研究生/注册岩土工程师,研究方向为边坡、基坑及地下空间等岩土工程治理设计。

3D Finite Element Numerical Analysis of the Stability of a Tunnel over the Mined Area

LI Senlin1, MA Boheng1, GE Yuxiang1, XU Fanqiang1， LUO Bodang2   

  1. （1.Zhongkan Geotechnical Investigation Design and Research Institute Co., Ltd., Baoding Hebei 071069；
    2.Longyan Mine Mining Co., Hebei Iron and Steel Group, Xuanhua Hebei 075100）
  • Received:2014-11-11 Online:2015-10-20 Published:2015-11-06

摘要： 山西某隧道下伏两层采空区，虽经注浆充填，但上覆岩体变形已经发生，为了研究两层采空区的叠置效应对隧道整体稳定性的影响，采用三维有限元法模拟了该两层煤矿开采及充填过程，得出其上覆岩体在采空后的变形移动特征及应力场的分布和采空区充填后的地表残余变形。通过对模拟结果的分析，结合钻孔及物探资料，划分了其覆岩垂直变形带，从而确定复式采空区覆岩变形带与隧道的空间几何关系，据此分析评价该隧道的整体稳定性，经验证所得评价结果可作为指导隧道开挖施工的依据。

关键词: 煤矿采空区, 隧道, 整体稳定性, 三维有限元法

Abstract: A tunnel in Shanxi Province is over two layers of the mined areas. Although the mined areas are filled and grouted, the deformations within the surrounding rock mass have occurred and its impact on the proposed tunnel construction has to be evaluated. This effects of the underlying two layers of mining extraction and backfill process are simulated by using three dimensional finite element to obtain deformation field of the rock mass above the mined cavern and the residual deformation of the same area after the backfill and grouting operation. Combined with numerical analysis results, test boring and geophysical survey information, the vertical deformation zones above the mined area and their dimensions can be divided: caving zone, fractured zone and transitional deformation zone. The stability of the tunnel construction in these zones can therefore be evaluated. 

Key words: Coal Mined Area, Tunnels, Global Stability, Three Dimensional Finite Element Analysis