某公路隧道围岩抗压强度试验研究

Experimental Study on Compressive Strength of Surrounding Rock of a Highway Tunnel

山西左涉一级公路某隧道工程穿越断层破碎带,地质状况复杂。为明确隧址处地质详情,对地下岩层性质、地质构造等作了研究。同时从现场选取不规则岩块及钻探取得岩芯样本,对所获样本进行了点荷载试验及单轴抗压强度试验。试验结果表明:受断层破碎带影响,隧道围岩强度不高。湿润状态下岩石试件点荷载强度是干燥状态下的65%,浸水后岩石的抗压强度显著降低,因此当隧道施工时遇到涌水等突发状况应及时采取措施。

A tunnel project of Zuoshe first grade highway in Shanxi Province crosses the fault fracture zone,which is in complex geological conditions. In order to determine the geological details of the tunnel site, the properties of underground strata and geological structure are studied. In addition, selecting irregular rocks and core samples obtained by drilling to carry out the point load test and uniaxial compressive strength test. The test results show that, affected by the fault fracture zone, the strength of the tunnel surrounding rock is low. The point load strength of the wet rock specimen is 65% of that of the dry rock specimen, indicating that the compressive strength of rock after immersion is significantly reduced. Therefore, measures should be taken in time in case of water gushing and other emergencies during tunnel construction.