地铁隧道施工对近接建筑影响的数值分析

Numerical Analysis of the Influence of Metro Tunnel Adjacent Building Structure

以某市地铁一号线隧道洞室的开挖工程为背景,采用FLAC3D软件,通过模拟研究隧道洞室开挖施工对相邻建筑地基基础的影响,并根据现场测量数据及数值模拟计算结果,回归得到一合适的测压系数。结果表明:当测压系数取值为0.25时,采用FLAC软件进行数值模拟能较好地符合现场实际情况;采用混凝土支护桩和预应力锚索组合防护措施,能显著降低隧道洞室施工对相邻建筑地基的影响。

Based on the tunnel construction of a city subway line, FLAC3D is used to simulate the effects of the tunnel construction on the foundation of the adjacent building. Coefficient of horizontal pressure K0 is introduced by the field measurements data and the calculated values. In conclusion, the numerical simulation using FLAC is close to the true value of the project when the value of K0 is 0.25, and the effects of the tunnel construction on the foundation of the adjacent building will be significantly reduced by using concrete retaining piles and pre-stressed cables.