大型地下洞室地质缺陷诊断技术

Geological Defect Diagnosis Technology of Large Underground Cavern

大型地下洞室的地质情况问题很多,对开挖影响很大,结合在建硬梁包水电站大断面、蚀变岩、大挖空率组成的复杂地质条件下的大型地下洞室的实际情况,运用岩石点荷载试验、声波测试、地质素描、钻机钻进速度、超前地质雷达、钻孔成像和爆破测振仪等多种技术,对开挖中存在的缺陷进行验证及地质缺陷诊断,即推测地下厂房开挖岩墙地质条件复杂、断层影响带、普遍存在绿帘石化面蚀变现象、岩石裂隙发育且岩体破碎杂乱、岩石强度不均匀且软硬差异大等不利地质条件。结果表明:依据上述各种缺陷诊断技术得出的预报效果较准确,其可以为工程施工提供有效的支持。

There are many geological problems of large underground caverns.They have a great impact on the excavation.Combined with the actual situation of large underground caverns under the complex geological conditions in Yingliangbao Hydropower Project,such as large section,altered rock and large excavation rate,various technologies such as rock point load test,acoustic wave test,geological sketch,drilling speed,advanced geological radar,borehole imaging and blasting vibration meter are used to verify and diagnose the defects existing in the excavation.It is speculated that the geological conditions of the excavated rock wall of the underground powerhouse are complex,the fault influence zone,the alteration of epidote surface is common,the rock crack is developed and the rock mass is broken and disordered,the rock strength is uneven and the difference between soft and hard is large,and other adverse geological conditions.These results show that the prediction effect based on the above defect diagnosis technology is accurate,and it can provide effective support for engineering construction.