非开挖穿河管道工程对堤基渗流稳定的影响评价
摘要:非开挖穿河管道工程在河流与堤基下的地层中形成一条隐蔽、弯曲的扰动带,为了评价该扰动带诱发渗透破坏的可能性,结合工程实例建立了相应的地下水流数值模拟模型。利用该模型,在极端不利的水文、气象条件下,计算地下水流场中最大水力坡度;依据临界水力梯度法,定量评价工程诱发渗透破坏的可能性。实例研究表明,最大水力坡度值随河水位上升而逐渐增大,但增速逐渐变缓;河道底部厚度不大但渗透系数很小的淤泥层,对最大水力坡度值的影响十分明显。
Abstract:A covert and curving zone,which is disturbed by trenchless pipeline engineering,is formed under the river and dyke stratum. Based on an actual engineering, a corresponding groundwater simulation model is proposed for evaluating the possibility of seepage failure induced by the disturbed zone Under the extremely unfavorable hydmlogy-weather conditions,the maximum groundwater flow gradient is estimated by the simulation model. Then, the possibility of seepage failure induced by engineeng can be quantitatively analyzed based on the critical hydraulic gradient method. The result shows that the maximum groundwater flow gradient is increasing gradually and its acceleration is decreasing corresponding to increasing river level. The maximum groundwater flow gradient is influenced obviously by the thin and low-permeability silt layer of river bed.
中文标题：
非开挖穿河管道工程对堤基渗流稳定的影响评价
Seepage Stability Analysis on the Dyke Through by Trenchless Pipeline
作者：
周贤金,邓正东
Zhou Xianjin,Deng Zhengdong
作者简介:周贤金,1967年生,男,汉族,湖北天门人,工程硕士,高级工程师,主要从事岩土工程实践和研究工作。E-mail:zhouxianjin505@sina.com
通讯地址：
江苏省地质矿产勘查局第五地质大队, 江苏徐州 221004
JiangsuBureauofGeologyandMineralResourcesGeologyFifthBrigade,Xuzhou221004,Jiangsu,China
中图分类号:TU94+1
doi:10.3969/j.issn.1007-2993.2010.04.003
出版物：岩土工程技术
收稿日期:2010-05-26
网络出版日期:2021-07-06
关键词:非开挖,扰动带,设计洪水,冲刷作用,渗透破坏
Key words:trenehless,disturbed zone,design flood,washing action,seepage failure
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