基于降落漏斗曲线方程的西南岩溶区地下导水通道预测

Prediction of underground water channel in southwest karst area based on depression cone curve equation

摘要

【目的】为了揭示降落漏斗范围内导水通道存在的可能性,进一步为岩溶区塌陷治理、地下水绕流问题提供解决思路。【方法】以广西盘龙铅锌矿区为例,采用降落漏斗曲线计算钻孔水位的理论(差)值,通过对比分析理论(差)值与实测(差)值的差异,结合现场钻孔信息与塌陷信息,开展岩溶区地下导水通道的预测。【结果】结果表明,提出的方法能够较准确的进行岩溶导水通道的预测。【结论】在形成稳定降落漏斗的岩溶含水层中,钻孔的水位实测值低于理论值(h_实测<h_理论)时,或实测差值高于理论差值(Δh实测>Δh理论)时,钻孔处存在岩溶导水通道;提出了降落漏斗的“衍射特征”,即漏斗影响范围内存在的相对隔水层改变了隔水层外测点的水平距离,改变后的距离应为l+r。降落漏斗的衍射特征能够准确揭示相对隔水层中径流通道的存在。

Abstract

[Objective] In order to investigate the potential existence of karst water channels within the depression cone area, and to provide solutions for addressing collapse risks in karst regions and groundwater flow issues near inadequate waterproof or intermittent curtains, [Methods] taking the Panlong lead-zinc mine area in Guangxi as a case study, the theoretical value(difference)of the water level at the observation point is calculated using the descending funnel curve. By comparing and analyzing the differences between the theoretical and measured(difference) values, along with on-site drilling and collapse data, a prediction of the underground water channels in the karst region will be made. [Results] The result prove that the proposed method can accurately predict the karst water channel. [Conclusion] In a karst aquifer that forms a stable depression cone, when the measured water level of a borehole is lower than the theoretical value(h_Measure<h_Theory), or when the measured difference exceeds the theoretical difference(Δh_Measure>Δh_Theory), it indicates the presence of a karst water channel at the borehole. The concept of the landing funnel is introduced, suggesting that the relative aquifuge within the influence range of the funnel alters the horizontal distance of the measurement points outside the aquifuge. The adjusted distance should be represented as l+r. The diffraction characteristics of the cone of depression can indicate the presence of runoff channels within the adjacent aquifuge.</h

关键词

西南岩溶区 / 裘布依假定 / 降落漏斗 / 导水通道 / 衍射特征 / 影响因素

Key words

southwest karst areas / Dupuit presupposition / falling funnel / water conducting channel / diffraction characteristic / influencing factors

基金资助

国家自然科学基金项目(52468047)

广西地质矿产勘查开发局《广西矿山水文地质勘查评价关键技术研究人才小高地》项目

南方石山地区矿山地质环境修复工程技术创新中心开放课题资助项目(NFSS2023021)

南方石山地区矿山地质环境修复工程技术创新中心开放课题资助项目(NFSS2023022)