隧道围岩稳定性分析方法与应用

Analysis Method and Application of Tunnel Surrounding Rock Stability

为了提高隧道围岩稳定性分析的准确性,本文采用弹性力学理论展开对隧道围岩稳定性分析,提出了隧道围岩的应力及应变的计算方法,对国内某隧道围岩施工过程中的应力及应变进行了监测,并对比了计算值与监测值之间的差距。基于监测数据发现,拱顶处的竖向位移最大;拱顶处实测值应力值最大,离拱顶越远,实测值越来越小,左右边墙最小;拱顶处的钢拱架应力最大,最小位置位于边墙处,拱肩位置的应力介于两者之间;拱顶处的轴力最大,其次是拱肩位置,边墙最小;对比结果表明本文所提出的应力及应变方法相较于目前的主流模拟软件更为准确,更接近隧道围岩的真实应力应变状态。研究结果对于提高隧道围岩稳定性分析的准确性具有一定的推动作用。

In order to improve the accuracy of tunnel surrounding rock stability analysis,this paper uses the theory of elasticity to analyze the stability of tunnel surrounding rock,puts forward the calculation method of stress and strain of tunnel surrounding rock,monitors the stress and strain during the construction of a super large section tunnel in China,and compares the gap between the calculated value and the monitored value.Based on the monitoring data,it is found that the vertical displacement at the vault is the largest;The measured stress value at the arch crown is the largest,the farther away from the arch crown,the smaller the measured value,and the smallest on the left and right side walls;The stress of the steel arch frame at the vault is the largest,the minimum position is at the side wall,and the stress at the spandrel is between the two;The axial force at the vault is the largest,followed by the position of the spandrel,and the side wall is the smallest;The comparison results show that the stress and strain method proposed in this paper is more accurate than the current mainstream simulation software and closer to the real stress-strain state of tunnel surrounding rock.It can promote the accuracy of tunnel surrounding rock analysis.