真空管井在互层土层中降水效果的数值模拟  

Numerical Simulation of Precipitation Effectof Vacuum Tube Well in Interlayer Soil

作　　者：陈剑 熊宗海 范卫琴 张红章[2,3] 徐升 CHEN Jian;XIONG Zong-hai;FAN Wei-qin;ZHANG Hong-zhang;XU Sheng(Poly(Wuhan)Real Estate Development Co.Ltd.Hubei 430074,China;Wuhan Fengda Geological Engineering Co.Ltd,Wuhan,Hubei 430074,China;College of Architecture and Civil Engineering,Sanming University,Samming 365004,China)

机构地区：[1]保利(武汉)房地产开发有限公司,湖北武汉430074 [2]武汉丰达地质工程有限公司,湖北武汉430074 [3]三明学院建筑工程学院,福建三明365004

出　　处：《三明学院学报》2019年第6期78-84,共7页Journal of Sanming University

基　　金：福建省中青年教育科研项目(JAT170538);武汉市市政建设集团有限公司科研项目(wszky201820)

摘　　要：以武汉华润万象城基坑降水为依托,通过有限差分软件FLAC3D,对该互层土采用真空管井降水的过程进行数值模拟,探讨真空井管降水条件下土体内渗流场的变化规律,通过在计算模型中设置不同的真空度和井距,得出以下结论:当管井内有6.5kPa真空度时,其涌水量相当于同等条件下普通管井的3.5倍;管井内真空度每提升2kPa,互层土含水层的涌水速度及涌水量大约增加25%至30%;在本工程土层分布和水文地质条件下,互层土真空降水最优的井径比为25~30。Based on the dewatering in Wanxiangcheng, Wuhan, the process of dewatering by vacuum tube well in the interbedded soil is simulated by finite difference software FLAC3 D. The variation law of seepage field in the soil under the condition of vacuum dewatering is discussed. By setting different vacuum degree and well space in the calculation model,the following conclusions are drawn:When the vacuum is 6.5 kPa in the pipe well, the water inflow is 3.5 times that of the ordinary pipe well under the same conditions;when the vacuum is increased by 2 kPa in the pipe well, the water inflow velocity and water inflow volume of the interbedded soil aquifer increase by 25% to 30%. Under the conditions of soil distribution and hydro-geology in the project, the optimum diameter ratio of the vacuum dewatering in the interbedded soil is 25~30.

关 键 词：互层土 真空管井 基坑降水 数值模拟 

分 类 号：TU463[建筑科学—结构工程]