摘要
通过对现行公路隧道规范中提出的浅埋段围岩压力计算方法进行分析,发现在埋深浅埋段Ⅳ~Ⅴ级围岩压力计算值与工程实际偏差较大。为探索合理的计算方法,对浅埋段隧道开挖后围岩体变形破坏机理及假定条件进行了对比与分析,提出了在浅埋段,将全厚度“松散压力力”调整为“松散压力+形变压力”的围岩压力计算方法,结果表明,该方法计算结果接近工程实际,可为后续类似工程设计提供计算方法和思路。
Through analyzing the calculation method of surrounding rock pressure of shallow buried section proposed in the current highway tunnel specification,it is found that the calculated pressure value of Class IV to V surrounding rock in the shallow buried section has a large deviation from the actual engineering practice.To explore a reasonable calculation method,the deformation and failure mechanism and assumed conditions of the surrounding rock mass after the excavation of the shallow buried section are compared and analyzed,and it is proposed that the calculation method of"loosening pressure"for through thickness of the rock mass be modified to"loosening pressure+deformation pressure".The result shows that the calculation result of this method is close to the actual engineering practice,and it provides calculation methods and ideas for subsequent similar engineering design.
作者
韩文斌
薛旋
HAN Wenbin;XUE Xuan(PowerChina Northwest Engineering Corporation Limited, Xi' an 710065,China)
出处
《西北水电》
2021年第5期82-85,共4页
Northwest Hydropower
关键词
洞口浅埋段
围岩压力
塌落拱
松散压力
形变压力
shallow buried section of tunnel entrance
surrounding rock pressure
collapsed arch
loosening pressure
deformation pressure
