基于有限差分法的双孔平行隧道下穿路面沉降规律研究

Research on Double Holes Parallel Tunnel Under Wear Surface Based on Finite Difference Method

基于有限差分法对双孔平行隧道开挖施工所引起的地表沉降进行了数值模拟,并将理论值与计算值相对比。结果表明:计算值与理论值变化规律基本一致,数值模拟产生的沉降值小于理论值。在隧道间距等于1.5 R(R为隧道断面直径)工况下,通过增加隧道埋深,沉降槽宽度对周边建筑物的影响范围大致在距开挖隧道直径(0.3~2.7)R范围内。地表最大沉降量随埋深的增大而减小,可近似认为是呈线性相关。

Based on the finite difference method,a numerical simulation of ground surface settlement caused by the excavation of double-hole parallel tunnel has been made and the actual value and theory value is compared,the result shows that the calculated results is nearly the same with the theoretical result in the rules of variation and the settlement by the numerical computation is less than the theoretical method. When the gap between the tunnels is equal to 1. 5 R（ R is the tunnel section diameter）,surrounding buildings are influenced by the width of subsider according to the increasing the depth of the tunnels. The diameter impact range is 0. 3 R to 2. 7 R for the tunnels. The maximum settlement of the surface will decrease with the increase of the buried depth,which can be seen as linear correlation approximate.