大型挖入式海港基坑降水渗流特性研究  

Characteristics Analysis of Seepage Fields in Foundation Pits of Large Sea Ports

作　　者：熊磊[1] 李书杰 王列健 黄诗渊[1] 

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆市水利电力建筑勘测设计研究院,重庆401121

出　　处：《五邑大学学报（自然科学版）》2015年第2期31-37,共7页Journal of Wuyi University(Natural Science Edition)

摘　　要：结合某沿海地区的大型挖入式海港的基坑降排水工程,基于二维渗流有限元法,对开挖基坑渗流量与止水帷幕距基坑开挖区的距离、基坑深度及止水帷幕入土深度之间的关系进行研究分析.结果表明：随着基坑开挖深度的增大,基坑海陆两侧渗流量均逐渐增加,当基坑深度达到20 m以上时,海侧渗流量增幅显著增大,陆侧渗流量则继续保持缓慢增长趋势;随着止水帷幕与基坑开挖区距离的增加,海陆两侧渗流量均呈减小趋势,但减小幅度逐渐变小,在距离为100 m时渗流量的降幅最大,当距离增大至300 m以后,距离对渗流量的影响较小;随着止水帷幕入土深度的增加,基坑渗流量呈减小趋势,帷幕深入石灰岩层后,其深度增加则渗流量减小更为明显,在深度10~14 m时降幅最大,但随着深度继续增加,防渗效果逐渐降低,建议止水帷幕入土深度尽可能达到14 m,以获得较为理想的防渗效果.In light of foundation pit drainage engineering of a big excavated port in China’s coastal area, based on the two-dimensional seepage finite element method, the foundation pit seepage flow, the distance from the stop-water heavy curtain to the foundation pit, relationship between the depth of the foundation pit excavation area and the stop-water heavy curtain were studied. The results show that with the increase of excavation depth, the foundation pit seepage flow gradually increased; when the foundation pit depth was more than 20 m, the sea side seepage flow increased significantly with the increase of the pit depth, and the land side seepage flow with minimal growth also increased; with the increase of the distance from the water-stop curtain to foundation pit excavation area, the foundation pit seepage flow was on a trend of decrease, but the range of decrease became smaller; the seepage flow declined most at the distance of 100 m, and when the distance increased to 300 m,the effect of distance on seepage flow was less. The seepage flow of foundation pit reduced with the increase of the depth of the water-stopping curtain, the impact of the increase of the depth on the reduced seepage flow became obvious when the curtain went deep into the limestone. The drop amplitude reached the largest at the depth of 10 m to 14 m, but with the increase of depth, the anti-seepage effect decreased gradually. It is suggested that the depth of the water-stop curtain just reach the value of 14m in order to achieve the ideal anti-seepage effect.

关 键 词：基坑 降排水 渗流 有限元分析 浸润线 渗流量 

分 类 号：TV139.14[水利工程—水力学及河流动力学]