摘要
依托南岭隧道改扩建工程建立数值模型,将数值模型结果与监测数据进行对比验证模型的准确性,并利用数值模拟对扩建隧道地层沉降曲线进行拟合,提出扩建隧道围岩破坏的滑裂面位置的确定方法;然后考虑倾斜滑动面上的摩阻力,将隧道拱顶上方滑裂面曲线进行简化,并基于太沙基理论提出改进的扩建隧道围岩压力计算方法,最后通过与工程实例对比,验证改进的计算方法的合理性与适应性。研究结果表明:传统太沙基理论计算围岩压力与实测结果相差较大,采用改进的围岩压力计算方法得到的围岩压力与实测值更为吻合,计算结果与实测值相对误差不超过3%,对于扩建隧道具有较好的适用性,可以对施工过程中的扩建隧道的围岩压力进行估算。
The numerical model was established based on the reconstruction and expansion project of Nanling tunnel,and the accuracy of the model was verified by comparing with the monitoring data.The stratum settlement curve of the expansion tunnel was fitted by using the numerical simulation,and a method for determining the slip surface was put forward when the surrounding rock was damaged.Then,the slip surface curve above the tunnel vault was simplified considering the friction on the inclined slip surface.Based on the Terzaghi theory,an improved calculation method of the surrounding rock pressure of the expansion tunnel was proposed,and the rationality and adaptability of the method were verified by comparing with the engineering examples.The results show that the pressure of surrounding rock calculated by the traditional Terzaghi theory is quite different from the measured value,while the results obtained by the improved calculation method of surrounding rock pressure are more consistent with the measured values,and the difference between the calculated result and the measured value is less than 3%.It has better applicability for the expansion tunnel and can estimate the surrounding rock pressure of the expansion tunnel in the construction process.
作者
柏谦
赵文
王鑫
程诚
路博
BAI Qian;ZHAO Wen;WANG Xin;CHENG Cheng;LU Bo(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第5期1562-1569,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51878127)
中央高校基本科研业务专项资金资助项目(N180104013)。
关键词
隧道工程
隧道扩建
滑裂面
围岩压力
tunnel engineering
tunnel expansion
slip surface
surrounding rock pressure
