Deformation Performance of Double Steel Sheet Piles Cofferdam

doi:10.16183/j.cnki.jsjtu.2009.10.013

Abstract

Abstract:

Large span double-row steel sheet piles were constructed in marine environments to serve as cofferdams of dry dock projects. Due to the construction of the dock excavation, considerable deformation of the cofferdam could occur. The deformation of the large span double-row steel sheet piles was measured during construction of a large scale dock project in Shanghai. Extensive field performance data were collected including lateral survey data and lateral inclinometer data. Construction procedures were summarized and correlated with monitoring data. The measured data were analyzed to investigate the deformation performance of the large span double-row steel sheet piles. A 2D finite-element method was also performed to study the effect of the soil reinforcement technology on deformation control of the double-row steel sheet piles.

Key words: large span double-row steel sheet piles, cofferdam, deformation performance, field observation, finite-element method

CLC Number:

TU476

HOU Yong-mao, WANG Jian-hua, GU Qian-yan. Deformation Performance of Double Steel Sheet Piles Cofferdam[J]. Journal of Shanghai Jiao Tong University, 2009, 43(10): 1577-1580,1584.

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施工步骤	施工时间/d	施工描述
S1	9	围堰内侧抽水，抽水标高由+ 2.60 m 降至 -2.10 m，降水深度4.7 m，围堰内侧泥面露出
S2	30	围堰内侧清淤回填，回填土至-2.10 m
S3	77	围堰内侧土体加固及桩基施工
S4	63	围堰内侧土体大开挖，放坡开挖至-8.00 m 标高
S5	29	泵房基坑开挖，放坡挖土至-15.90 m
S6	68	船坞坞口基坑分块开挖，挖土深度至-13.45 m

土层	ρ/ (kg·m^-3)	M	κ	λ	k×10⁷/ (cm·s^-1)
②₃上	1 840	1.24	0.009 8	0.118	495
②₃下	1 840	1.24	0.009 8	0.118	495
④	1 680	0.69	0.013 2	0.159	382
⑤_1-1	1 740	0.71	0.019 0	0.210	15.4
⑤_1-2	1 800	0.71	0.019 0	0.210	15.4
⑤_3-1	1 800	0.74	0.016 9	0.180	7.83
⑤_3-2	1 800	1.29	0.009 0	0.108	7.83