跨孔地震CT在类岩溶地层中的应用效果分析

Application Effect Analysis of Cross-hole Seismic CT in Karst-like Strata

类岩溶地层的溶蚀结构十分复杂,对岩体的稳定性、强度等均有不良影响,探明类岩溶的溶蚀结构对工程建筑安全十分必要。以我国西南某拦河闸的右岸交通桥勘察为例,对比分析跨孔地震CT与传统钻探勘察方法在钙质砾岩中应用效果的差异性。研究表明跨孔地震CT虽在精细岩溶探测方面还存在一定不足,但能够较清晰的显示类岩溶地层岩壁、基覆界线等边界轮廓,在总体地质条件探测、优化勘探工作量、节省投资、加快工期等方面具有一定优势。研究成果可对跨孔地震CT在类岩溶的应用效果及应用价值提供依据和参考。

The karst-like strata has very complex dissolution structures,which could have adverse effects on the stability and strength of the rock mass,therefore it＇s necessary to locate corrosion structure of karst-like for engineering safety reasons.In this paper a right-hand traffic bridge at a river sluice in southwestern China was taken as an example to illustrate the different application effects of cross-hole seismic CT and conventional drilling method.The investigation results show that the cross-hole seismic CT clearly imaged the boundary wall of rock and soil,and has great advantages on general geological detection,optimization of exploration workload,overall investment and construction duration.However,it may have limitations on the detection of micro karst conditions.The research results can provide useful references for the application of cross-hole seismic CT in karst-like areas.