摘要
为研究某电站上水库岩溶地层渗透问题和渗透规律,围绕其左岸分水岭布置水文地质钻孔和物探测试,对其岩溶发育特征进行了初步分析,然后基于钻孔编录成果从遇洞率和溶蚀率统计成果中对该水库左岸渗透问题进行了定量。结果表明:左岸分水岭内侧主要发育有岩溶小区,地表主要表现为落水洞(一般小于2 m)、沿断层的强溶蚀带、沿裂隙的溶隙、沿陡倾层面走向的密集溶蚀沟、缝、小的天生桥等;左岸分水岭车水桶组地层31个钻孔的岩溶遇洞率和溶蚀率发现遇洞率在75 m高程附近发生突变,溶蚀率在90 m高程左右发生突变,说明车水桶组地层存在库水岩溶性渗漏问题,并从物探成果得到验证。
In order to study the reservoir seepage problem and rule of a hydropower station located in a karst area,hydrogeological boring and geophysical prospecting were conducted surrounding the left watershed divide.The characteristics of karst development were analyzed.Quantitative analysis of the left bank seepage was made in respects of hole rate and solution ratio based on the borehole logging.The results of analysis demonstrate that there exists developed karst zone inside the left bank watershed with the earth surface characterized by sinkhole smaller than 2 m,intense solution belt along fault,solution fissure along crack,concentrated solution groove,fissure and small natural bridge along steep inclined strata;the hole rate and solution ratio suddenly change at EL.75 m and EL.90 m respectively as shown by the 31 boreholes in the Cheshuitong formation strata of left watershed divide.The results of geophysical prospecting also verify there exist reservoir karst seepage in the Cheshuitong formation strata.
作者
张志勇
ZHANG Zhi-yong(Water Conservancy and Hydropower Engineering Construction Supervision Center of Linyi City,Linyi 276000,China)
出处
《广西水利水电》
2020年第5期23-26,共4页
Guangxi Water Resources & Hydropower Engineering
关键词
岩溶
遇洞率
溶蚀率
水库渗透
Karst
hole rate
solution ratio
reservoir seepage
