摘要
以武汉市某基坑工程实例为背景,基于承压层坑内外水位降深及坑外地表沉降两大观测指标,采用有限元软件ABAQUS建立群井降水三维数值计算模型进行了数值模拟分析,通过设置多组计算工况,对在悬挂式止水帷幕不同插入比λ条件下,降水井不同滤管长度L及滤管埋深H对承压层坑内外水位降深及坑外地表沉降的影响规律进行了研究。研究结果表明:插入比λ对承压层坑内外水降深及坑外地表沉降的影响要远大于降水井滤管长度L及滤管埋深H的影响。在止水帷幕插入比λ=0.4~0.6时,通过改变滤管长度L及滤管埋深H来提高承压层坑内水位降深或降低承压层坑外水位降深具有较大的空间。止水帷幕插入比λ>0.6后起到较好的隔水效果,滤管埋深H宜位于承压含水层顶部,滤管长度L不宜超过0.4倍的承压含水层厚度M。
Taking a foundation pit project in Wuhan as the background,based on two observation indicators of water level drop inside and outside the confined layer pit and surface settlement outside the pit,a three⁃dimensional numerical calculation model for group well precipitation was established using finite element software ABAQUS for numerical simulation analysis.By setting multiple calculation conditions,under the conditions of different insertion ratios of suspended waterproof curtainsλ,the influence of different well screen lengths L and filter tube burial depth H on the water level drop inside and outside the confined layer pit and surface settlement outside the pit was studied.The research results indicate that the impact of the insertion ratioλon the water leverl drops inside and outside the confined layer pit and the surface settlement outside the pit is much greater than that of the length L and burial depth H of the well screen in the dewatering well.When theλis between 0.4 and 0.6,there is a large space to increase the water level drop inside the confined layer pit or decrease the water level drop outside the confined layer pit by changing the length L and the burial depth H.Whenλexceeds 0.6,it has a good water blocking effect.The buried depth H of the well screen should be located at the top of the confined aquifer,and the length of the well screen L should not exceed 0.4 times the thickness of the confined aquifer M.
作者
帅红岩
李光诚
黄俊杰
邓敏
王建筱
SHUAI Hongyan;LI Guangcheng;HUANG Junjie;DENG Min;WANG Jianxiao(Hubei Institute of Urban Geological Engineering,Wuhan Hubei 430050,China;China University of Geosciences(Wuhan),Wuhan Hubei 430074,China)
出处
《钻探工程》
2024年第6期141-151,共11页
Drilling Engineering
关键词
悬挂式止水帷幕
插入比
降水井
滤管参数
数值模拟
suspended waterproof curtain
insertion ratio
dewatering well
parameters of well screen
numerical simulation
