文献类型：期刊文献

中文题名：广西武宣土洞发育水动力条件评价

英文题名：Assessment on the hydraulic condition of forming soil-caves collapse in Wuxuan,Guangxi,China

作者：姜伏伟

第一作者：姜伏伟

机构：[1]贵州理工学院资源与环境工程学院;[2]中国地质科学院岩溶地质研究所

第一机构：贵州理工学院资源与环境工程学院

年份：2017

卷号：44

期号：2

起止页码：90-95

中文期刊名：水文地质工程地质

外文期刊名：Hydrogeology & Engineering Geology

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD_E2017_2018】；

基金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]226)

语种：中文

中文关键词：土洞;管道流;水动力条件;临界切应力;临界地下水流

外文关键词：soil-caves; pipe flow; hydraulic condition; critical shear stress; critical velocity of groundwater

摘要：本文分析了武宣土洞发育的地质背景、水动力诱发土洞的过程,在理想条件下,建立了土体渗透破坏形成土洞的管道流机理模型,根据管道流理论,分析得出土洞发育水动力条件表达式。通过自行设计的管道流测试仪装置,进行管道流模拟试验,计算得出研究区土洞发育的临界切应力为21.20 Pa。运用电子扫描电镜技术,测试研究区孔隙等效直径为31.6 nm,计算得出研究区土洞发育的临界水流为0.530 cm/min。对比临界水流和现场监测的实际地下水流,评价土洞发育的可能性。结果表明,目前情况下,地下水流未达到临界值,不具备引起黏土流失形成土洞的水动力条件。
This paper analyzes the geological background and the process induced by the hydrodynamics of developing soil-caves in Wuxuan,a city in Guangxi Provence,china. Under ideal conditions,the mechanism model of the seepage failure of soil to forming soil-caves is the pipe flow. From the theory of the pipe flow,it establishes the expression of the hydrodynamics causing the soil-caves. Next,through the experiment designed to simulate the pipe flow,it obtains the critical shear stress 21. 20 Pa to lead to soil-caves in the study area.The equivalent diameter of soil pores is 31. 6 nm tested by the electron scanning microscopy. With the known parameters,it calculates the critical velocity of ground water 0. 530 cm / min. Comparing the monitoring data of the ground water in the field with the critical hydraulic values,the study assesses the probability of the soilcaves collapse. The result shows that the current hydraulic condition doesn＇t have enough the dynamic to form the soil-caves collapse in Wuxuan.