砂卵石地层非稳定流回灌模型试验研究  

Experimental Study on Unsteady Seepage Recharge Model of Sandy Cobble Stratum

作　　者：石伟航 徐帮树 马秀媛 路林海 夏鹏 李罡 SHI Wei-hang;XU Bang-shu;MA Xiu-yuan;LU Lin-hai;XIA Peng;LI Gang(School of Qilu Transportation,Shandong University,Jinan 250061,China;Jinan Rail Transit Group Co.Ltd,Jinan 250061,China)

机构地区：[1]山东大学齐鲁交通学院,济南250061 [2]济南轨道交通集团有限公司,济南250101

出　　处：《科学技术与工程》2020年第10期4073-4079,共7页Science Technology and Engineering

基　　金：国家自然科学基金(50909056);山东省自然科学基金(ZR2014EEM029,ZR2014EEM014);住房城乡建设部2015年科学技术项目(2015-K5-004)。

摘　　要：为研究砂卵石地层回灌渗流场水头时空分布规律,依托济南轨道交通R1线地下车站基坑工程,研制了回灌模型试验系统,分别进行了潜水层和承压水层单井回灌模型试验,建立了适用于砂卵石地层的非稳定渗流单井回灌数学模型。试验结果表明,在承压水工况下,基于Theis非稳定流公式的计算数据和监测数据的水头变化趋势基本一致,皆为凸形曲线,但数值上存在明显的误差。在潜水工况下,Theis公式只能描述其饱和渗流阶段的变化趋势,并不适用非饱和渗流阶段。在定量回灌条件下,距离回灌井越近的地方越先达到饱和渗流。最后,回灌存在井损现象,井损水头占回灌水头的3.2%~52.5%左右。To study the temporal and spatial distribution of the head of the seepage field in sandy cobble stratum,a recharge model test system was developed using the foundation pit of the underground station of the Jinan Rail Transit R1 line,and single-well recharge model tests of confined and unconfined aquifers were carried out.A mathematical model for unsteady seepage single-well recharge in sandy cobble stratum was established.Results show that,under confined aquifer condition,the monitoring data and the calculation data using the Theis unsteady flow formula showed similar variation trends at water head as convex curves,but error was obvious in value.Under the unconfined aquifer condition,the Theis formula could describe the changing trend of the saturated seepage stage only,and was not applicable for the unsaturated seepage stage.Under quantitative recharge condition,the closer to the recharge well,the quicker to reach the saturated seepage.At last,the recharge resulted in well loss,and the head of the well loss accounted for 3.2%~52.5%of the recharge head.

关 键 词：砂卵石地层 回灌模型试验 非稳定流 数学模型 井损水头 

分 类 号：TU411.4[建筑科学—岩土工程]