乌鞘岭隧道7号斜井围岩变形及稳定性分析

Analysis on Deformation and Stability of Surrounding Rock in No.7 Slanting Shaft of Wushaoling Tunnel

通过对乌鞘岭隧道7号斜井砂岩夹泥岩段围岩水平收敛和拱顶沉降两项内容的现场监测,获得围岩初期变形资料。对资料的回归分析得出:围岩初期变形随时间在总体上遵循指数函数、倒数函数及对数函数三种函数模型变化,可分为快速变化发展阶段和缓慢趋稳阶段两个阶段,并在20日之后渐趋于稳定。根据回归分析结果,利用位移加速度正负的判据分析和评价了围岩稳定性。结果表明,围岩初期变形趋于稳定。

After monitoring the change of horizontal constringency and arch sedimentation of surrounding sandstone with mudstone interlayer in the No. 7 slanting shaft of Wushaoling tunnel, the data of rock initial deformation were obtained. Based on the conclusion from regressing and analyzing the data of rock initial deformation that the change of rock initial deformation with time generally follows three function models, namely , the exponent function, reciprocal function and logarithm function, and the curve of rock initial deformation with time can be divided into rapidly changing and slowly changing phases, and the rock deformation becomes stable after 20 days. The stability of surrounding rock was discussed and evaluated based on the criterion of rock dis- placement acceleration. The result indicates that the surrounding rock in the No. 7 slanting shaft of Wushaoling tunnel has good stability.