文山小河尾水库岩溶含水渗漏通道的地球物理新证据

doi:10.11720/wtyht.2023.1244

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摘要

小河尾水库作为文山市境内海拔最高的岩溶水库,自建成蓄水以来,存在严重的库水渗漏问题,虽经多次防渗处理,但水库渗漏的情况仍未改善。为确定小河尾水库地下岩溶渗漏通道的位置,以指导后期水库防渗工程的部署,本次研究在工程区内利用高密度电法与音频大地电磁法探测水库地下渗漏通道,通过对物探测试数据进行2D反演试算,发现将这2种方法相结合具有可行性,2种方法物探异常点位置高度吻合,能精确反映地下不同深度的地质情况,探测结果能为后期设计和施工提供参考依据。基于实测数据反演结果,并结合地表地质资料、钻探验证手段,推测水库主要存在2条NNE向且高程集中于1 800 m以上的岩溶含水渗漏通道,其中I号岩溶渗漏通道位于灰岩与硅质岩接触带附近,II号岩溶渗漏通道位于灰岩内部岩溶裂隙处。同时基于本次物理勘探结果,笔者也为小河尾水库后期防渗处理提出了帷幕灌浆工程部署建议。

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	周建兵
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关键词 ：物理勘探, 岩溶水库, 渗漏通道, 音频大地电磁法, 高密度电法

Abstract：

As a karst reservoir with the highest altitude in Wenshan City,the Xiaohewei reservoir has been suffering from severe water seepage since its completion.Despite several seepage control treatments,the seepage of the reservoir is still not effectively controlled.To determine the locations of underground karst seepage pathways of the reservoir and guide the later seepage control project,this study detected the seepage pathways in the project area combining the high-density resistivity method and the audio magnetotelluric method.The 2D inversion trial calculation of geophysical testing data indicates the feasibility of combining the two methods.The methods show highly consistent geophysical anomaly positions and can accurately reflect the geological conditions at different burial depths.Thus,their detection results can be referenced for later design and construction.Based on the inversion of measured data,the surface geological data,and the drilling verification means,it is speculated that the reservoir mainly has two NNE-directed karst water-bearing seepage pathways with an elevation of more than 1 800 m.These two karst seepage pathways (No.1 and No.2) are located near the contact zone between limestones and siliceous rocks,and in the karst fissures inside limestones,respectively.Based on the geophysical exploration results,this study also puts forward some suggestions on the deployment of the curtain grouting project for later seepage control of the Xiaohewei reservoir.

Key words： geophysical exploration karst reservoir seepage pathway audio magnetotelluric method high-density resistivity method

收稿日期: 2022-05-20 修回日期: 2023-02-06 出版日期: 2023-06-20

ZTFLH:

P631.4

基金资助:国家自然科学基金项目(41702278);中国地质调查局地质调查项目(DD20190326);社会服务项目“云南省小河尾水库岩溶渗漏水文地质勘察”(YRSF-2020-505)

通讯作者: 罗锐恒(1970-),男,高级工程师,本科,主要从事水文地质工程地质研究工作。Email:sdylrh@126.com

作者简介: 周建兵(1988-),男,工程师,本科,主要从事水文地质工程地质研究工作。Email:419044071@qq.com

引用本文:

周建兵, 罗锐恒, 贺昌坤, 潘晓东, 张绍敏, 彭聪. 文山小河尾水库岩溶含水渗漏通道的地球物理新证据[J]. 物探与化探, 2023, 47(3): 707-717.
ZHOU Jian-Bing, LUO Rui-Heng, HE Chang-Kun, PAN Xiao-Dong, ZHANG Shao-Min, PENG Cong. New geophysical evidence for karst water-bearing seepage pathways in the Xiaohewei reservoir,Wenshan City. Geophysical and Geochemical Exploration, 2023, 47(3): 707-717.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1244 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I3/707

Fig.1 研究区水文地质简图

Table 1 研究区岩土介质电性参数

Fig.2 工作区地质概况及物探工作布置

Fig.3 高密度电法反演电阻率断面

Fig.4 第4测线AMT二维反演电阻率等值断面(a)和地质推断解释剖面(b)

Fig.5 第5测线AMT二维反演电阻率等值断面(a)和地质推断解释剖面(b)

Fig.6 第6测线AMT二维反演电阻率等值断面(a)和地质推断解释剖面(b)

Fig.7 小河尾水库ZK1(a)、ZK2(b)钻孔岩性柱状图

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