天生桥二级水电站灌浆质量物探评价方法及效果分析

GEOPHYSICAL APPRAISAL AND ANALYSIS OF GROUTING EFFECTS IN THE TIAHSHENQIAO SECOND-GRADE CASCADE HYDROPOWER STATION

天生桥二级水电站由于引水隧洞较长,穿越地层、岩溶,地质构造十分复杂,因此,对不良地质洞段除采取加强衬砌、桩基础等设计处理方案外,还对围岩实施高压固结灌浆处理,以加固围岩稳定。灌浆质量采用压水试验和综合物探手段检测.。笔者就引水发电隧洞特殊洞段物探检测工作独特的设计思路、资料处理方法和对灌浆效果的评价方法及结果进行了介绍。

The Tianshenqiao second-grade cascade hydropower station is a diversion-type power station. Because of the existence of relatively long diversion tunnel crossing complicated strata, karst and structures, conceptual schemes of reinforced liner and pile foundation were adopted to tackle the harmful geologic hole section. Besides, the surrounding rock underwent high pressure consolidation grouting to strengthen its stabilities. The quality of grouting was checked by water-pressure test and integrated geophysical prospecting. This paper mainly describes the unique designing thought in geophysical test, data processing, and methods, results and analysis of grouting effect appraisal in three diversion tunnels, in which the special section of main holes Ⅱ,Ⅲ and harmful geologic bodies were treated according to the corresponding design schemes.