非稳定承压水降水引起土层沉降分布规律分析.doc

非稳定承压水降水引起土层沉降分布规律分析
222,,王春波1,丁文其1,刘文军3,乔亚飞1,
(同济大学地下建筑与工程系,上海 2同济大学岩土及地下工程教育部重点实验室,上海 ;;
无锡市轨道交通发展有限公司,江苏无锡 )
dewateringofconfined waterincreases withtheincreaseof
土层沉降可用基于弹性半无限空间 Mhedistancetothegroundandthemaximumvalueemereson tgindlin位移解的推导公 t
eroofofthe confined parameters :无限承压含水层非稳定渗流降水时 h
, Pectinhe ground settlementoisson ratio and the cog t间对土层沉降影响显著;由承压水减压降水引起的土层分层 f
fined auifer permeabilitoefficient affectthe ground setqy c沉降随距地表距离的增加而增大,最大值位于承压含水层顶 theyw板处;影响上覆土层沉降的参
数中,泊松比和承压含水 t7 个
ncrease ofoverlainoilthickness and the confined yg s层渗透系数的变化对土层沉降影响很小;上覆土层厚度、承 sq压含水层厚度越大地表沉降值越小;上覆土层弹性模量较小 a
,,ttlementwhichisgreatwhenitsvalueissmallraduallgy we时对地表沉降影响较大,随着弹性模量的增加,其对地表沉 e
ettkens with the increase of elastic modulus. Ground s降的影响逐渐减弱;地表沉降随单井出水量、承压水水头降 a
lementincreaseswiththeincreaseofoutatervolumeof sinl-wg
深的增大而增加且近似成线性关系;单井出水量、承压含水
,,ewelland waterheaddrawdownfurthermoreaquasi linea
层厚度、承压水水头降深、上覆土层弹性模量不仅影响地表
r relationshixists between them. The outater volump e-w
沉降值的大小,还会影响地表沉降的空间分布.
,,eofsinle wellthe confinedauiferthicknessthe waterhgq
关键词:承压含水层;非稳定流;M移解;土层沉 eaddrawdownandtheelastic modulusofoverlainoilaffecyg sindlin 位
,降;降水时间;土层参数 tnotonlhevalueofgroundsettlementbutalso thesatiaytp
ldistributionofroundsettlement. g
摘要:承压含水层减压降水实质上是一个卸荷过程,其上覆
中图分类号:TU463 文献标志码:A
:c;u; MKeordsonfined auifernsteadeeaeindlin dy wqy spg
;;;islacementsolutionsoilsettlementdewaterinimesoil papgtrameters
Distribution Law ofSoilSettlementCausedby
UnsteadewaterinfConfined Water yDgo
1,21,2
, D, LWANG ChunboING WIU Wenienun3, qj
1,2
IAOYaeiQf
基坑工程中,如承压含水层顶板以上的土层重
量不足以抵抗承压水压力时基坑将发生突涌破坏, (, T1. Deartment of Geotechnical Enineerinoni Universitpgggjy,
,C; Geotechnicaland U承压水减压降水是保证深基坑工程安全施工的一个 gy Ly o
]1-2, Tnderround