洪屏抽水蓄能电站工程区主要工程地质问题及处理措施

洪屏抽水蓄能电站工程地质问题复杂，表现：（1）水文地质条件复杂：如输水系统（含地下厂房）地下水活动强烈，上水库断层发育，局部库盆与地下厂房存在水力联系，渗漏问题；（2）库岸稳定问题；上水库库岸稳定及下水库边坡稳定问题，等等。针对上述工程地质问题，前期各阶段在比选的基础上，结合枢纽建筑物布置，针对性开展地勘试验工作，查明了上水库库周及库底岩土体透水性、地下水位及其动态规律、水库渗漏及库岸边坡稳定性等主要工程地质问题；查明了下水库坝址区的工程地质及水文地质条件，开展了地应力测试、高压压水试验，岩土体物理力学试验等专项工作，根据长探洞出现的断层带涌水，上水库南库岸地下水位大幅度下降的水文地质问题，开展了水文地质示踪连通试验和渗漏计算。施工中除做好地质工作外，更注重是科学经济安全的技术处理措施，做好地质预报等工作；综合各种勘察手段及地质提供参数、上水库库盆防渗、输水系统衬砌型式及地下厂房洞室群排水设计采取合适有效的工程处理措施。使工程顺利，按时投产发电创造必要的条件。可供类似工程之借鉴。

MAIN ENGINEERING GEOLOGICAL PROBLEMS AND TREATMENT MEASURES OF HONGPING PUMPED STORAGE POWER STATION PROJECT AREA

Hongping pumped storage power station's engineering geological problems are complicated. (1)Hydrogeological conditions:Water conveyance system including underground powerhouse underground water acted strongly. Fault development of upper storage reservoir, hydraulic connection of basin and underground powerhouse, leakage problem. (2)Reservoir bank's stability:Stability of upper storage reservoir and its lower slope, et al. In allusion of above, we compared the former different stages of projects and studied the layout of main constructions, carried out test works specifically. Finally, we find out the water permeability of upper and bottom rock and earth mass, underground water and its dynamic regulation, leakage and stability of bank slopereservoir, knowing the engineering geology of lower storage reservoir and hydrogeologicalcondition, carring special work on measurement of geostress, high pressurepump-intest, and physical mechanics of rocks. Regarding to the problems like water burst on fault zone of long caving, the sharp fall of underground water in the south upper storage reservoir, we did some hydrogeological tracer connection tests and leakage calculation. During construction, we should work well not only on geological work but pay more attention to more scientific, more economic and more safety treatment as well as geological forecast. In conclusion of kinds of survey and the geology figures, we adopted effective engineering treatment on upper storage reservoir seepage-proofing, water conveyance systemlining type and underground caverns drainage design, which created a necessary condition for smoothly works for generate electricity in time. It can be used as a reference for similar projects.