公路隧道洞口浅埋段围岩压力计算方法探讨  

Discussion on Calculation Method of Surrounding Rock Pressure in Shallow Buried Section of Highway Tunnel Entrance

作　　者：韩文斌[1] 薛旋 HAN Wenbin;XUE Xuan(PowerChina Northwest Engineering Corporation Limited, Xi' an 710065,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《西北水电》2021年第5期82-85,共4页Northwest Hydropower

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.

关 键 词：洞口浅埋段 围岩压力 塌落拱 松散压力 形变压力 

分 类 号：TU45[建筑科学—岩土工程]