泰安市城区—旧县水源地岩溶塌陷演化过程分析

发布时间：2018-04-14 07:49

本文选题：岩溶塌陷 + 分布特征　；参考：《中国岩溶》2017年01期

【摘要】：通过综合分析项目前期开展的塌陷群现场调查、物探、钻探、地下水动态长期监测等多项工作所获取的珍贵资料,将泰安市区划分为三个岩溶塌陷集中区,分别讨论了岩溶塌陷的发育条件、分布特征及成因演化过程,最后有针对性地提出了岩溶塌陷防治对策。研究结果表明,区内岩溶塌陷多发生于以下区域:(1)埋藏型岩溶区,地层岩性主要为奥陶纪-寒武纪灰岩、白云岩;(2)断裂及其影响带;(3)上覆土层厚度小于20m,多层结构,即上部黏性土、中部砂类、下部黏性土区域;(4)岩溶地下水降落漏斗及其影响范围内。研究区岩溶塌陷是各种不良因素共同作用的产物,其中最重要的诱发动力条件为水动力条件,结合各类水文、地质、灾害资料,绘制岩溶塌陷与地层、降水、开采及岩溶水位关系图,可清晰地反映出在岩溶发育地区随着岩溶水开采量增大,岩溶水位随之降低,当岩溶水位低于基岩面后,岩溶塌陷开始发生,并且随着水位的降低及波动幅度的增大,塌陷次数明显增多的演化过程。
[Abstract]:Through the comprehensive analysis of the valuable data obtained from the site investigation, geophysical exploration, drilling and long-term monitoring of groundwater dynamics, the division of Taian City is divided into three karst collapse concentration areas.The development conditions, distribution characteristics and evolution process of karst collapse are discussed respectively. Finally, the countermeasures of karst collapse prevention and control are put forward.The results show that karst collapse occurs mostly in the following area: 1) buried karst area, and the stratigraphic lithology is mainly Ordovician Cambrian limestone, dolomite Xian2) fault and its influence zone: the overlying soil layer thickness is less than 20m, and the multi-layer structure.That is, upper clay, middle sand, and lower clay area. (4) karst groundwater fall funnel and its influence range.Karst collapse in the study area is the result of the joint action of various adverse factors. The most important induced dynamic condition is hydrodynamic condition. Combined with various hydrological, geological and disaster data, karst collapse, stratum and precipitation are drawn.The relationship between mining and karst water level can clearly reflect that the karst water level decreases with the increase of karst water exploitation in karst developed areas, and karst collapse begins to occur when the karst water level is lower than the bedrock surface.With the decrease of water level and the increase of fluctuation amplitude, the number of collapses increases obviously.
【作者单位】：山东省第五地质矿产勘查院;
【基金】：山东省国土资源厅地质勘查项目[鲁勘字2012(58)号]
【分类号】：P642.26

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