Effect of Channel-Type Transport Technology of Earthwork on the Deformation of Top-Down Deep Foundation Pit

doi:10.16183/j.cnki.jsjtu.2012.01.019

Abstract

Abstract:

The soft soil creep (SSC) model was adopted to simulate the whole process of a deep foundation pit with different construction conditions. Comparisons of the effect of different construction technologies on the deformation of foundation pit and the surroundings were made. The results show that the deformation features of the foundation pit under both construction technologies are similar. The top-down channel-type construction technology is more effective on controlling the deformation of the enclosure structures, and has less impact on the surrounding by decreasing the ground settlement, the lateral displacement of soil outside the pit and the upheaval mount of soil at the pit bottom. While considering the train load, with top-down channel-type construction technology, the deformation of the railway subgrade is safe.

Key words: deep foundation pit, top-down technology, channel-type construction, creep

CLC Number:

TU433

LIU Ying-jing, CHEN Jin-jian, WANG Jian-hua, XU An-jun, LI Yao-liang. Effect of Channel-Type Transport Technology of Earthwork on the Deformation of Top-Down Deep Foundation Pit[J]. Journal of Shanghai Jiao Tong University, 2012, 46(01): 89-93.

Figures/Tables 13

Fig. 1

Tab. 1

Fig. 2

Fig. 3

Tab. 2

Tab. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

References 7

[1]	杨志法, 张红梅, 尚彦军, 等.位移时空综合分析法及其在深基坑中的应用[J]. 工程地质学报, 1995, 3(4): 32-38.
	YANG Zhi-fa, ZHANG Hong-mei, SHANG Yan-jun, et al. The method of synthetically analysis displacement at time and space its application in deep excavation pits[J]. Journal of Engineering Geology, 1995, 3(4): 32-38.
[2]	夏冰, 夏明耀.上海地区饱和软土的流变特性研究及基坑工程的流变时效分析[J]. 地下工程与隧道, 1997 (3): 11-18.
[3]	杨雪强, 刘祖德, 何世秀.论深基坑支护的空间效应[J]. 岩土工程学报, 1998, 20(002): 74-78.
	YANG Xue-qiang, LIU Zu-de, HE Shi-xiu.Research about spatial effect of deep pit supporting[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(2): 74-78.
[4]	傅艳华, 王旭东, 宰金珉.基坑变形时间效应的有限元分析[J]. 南京工业大学学报: 自然科学版, 2005, 27(5): 32-36.
	FU Yan-hua, WANG Xu-dong, ZAI Jin-min.FEM analysis on time-effects of deep excavations[J]. Journal of Nanjing University of Technology: Natural Science, 2005, 27(5): 32-36.
[5]	Wang J H, Xu Z H, Wang W D.Wall and ground movements due to deep excavations in Shanghai soft soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(7): 985-994.
[6]	Brinkgreve R B J, Vermeer P A. PLAXIS version 8.2 Manual [M]. Rotterdam: Netherlands A A Balkema, 2002.
[7]	刘映晶, 陈锦剑, 王建华, 等.基坑逆作施工与上部运营铁路的相互影响分析[J]. 岩土工程学报, 2010, 32(S1): 142-145.
	LIU Ying-jing, CHEN Jin-jian, WANG Jian-hua, et al. Interaction between the top-down subsurface excavation and upside running railway[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S1): 142-145.

土层	c/kPa	φ/(°)	λ^＊×10²	κ^＊×10³	μ^＊×10⁴
②	17	22.5	6.1	5.0	6.0
③₁	12	18.0	6.5	14.8	8.0
④	14	11.5	6.0	16.4	24.0
⑤_1-1	16	12.5	3.1	7.7	24.0
⑤_1-2	16	17.5	8.4	16.3	24.0
⑥	46	17.0	4.2	15.6	23.0
⑦₁	7	28.5	2.8	14.5	9.0

计算步	t/d	施工工况
Stage 1	6	第1层土开槽
Stage 2	12	第1层土开挖
Stage 3	13	第3道砼支撑制作及养护
Stage 4	6	第2层土开槽
Stage 5	13	第2层土开挖
Stage 6	24	A区下2层板制作及养护
Stage 7	6	第3层土开槽
Stage 8	14	第3层土开挖
Stage 9	14	第4道砼支撑制作及养护
Stage 10	6	第4层土开槽
Stage 11	12	第4层土开挖
Stage 12	12	A区结构底部制作

计算步	t/d	施工工况
Stage 1	26	第1层土开挖
Stage 2	13	第3道砼支撑制作及养护
Stage 3	28	第2层土开挖
Stage 4	24	A区下2层板制作及养护
Stage 5	29	第3层土开挖
Stage 6	14	第4道砼支撑制作及养护
Stage 7	26	第4层土开挖
Stage 8	12	A区结构底部制作

[1]	GUO Dayou, HUANG Xiaoping, WANG Fang. The Creep Properties and Numerical Simulation for PMMA Window [J]. Journal of Shanghai Jiaotong University, 2019, 53(5): 513-520.
[2]	ZHAO Nailong,WANG Weizhe,LIU Yingzheng. Influence of Main Steam Temperature and Pressure Fluctuations on the Creep-Fatigue Damage of a Steam Turbine Rotor [J]. Journal of Shanghai Jiaotong University, 2019, 53(2): 127-133.
[3]	LI Yipoa，HU Jianhuia,b,c，CHEN Wujuna，YIN Yuea，YANG Deqingb,c. Experimental Study of Creep Properties of Ethylene Tetrafluoroethylene Foil [J]. Journal of Shanghai Jiaotong University, 2018, 52(2): 147-151.
[4]	ZHANG Wei1,2,WANG Xiaowei1,2,3,JIANG Yong1,2 HUANG Xin1,2,GONG Jianming1,2,WENG Xiaoxiang1,2. Simulation of Creep Deformation for P92 Steel Based on Multiple Damage Parameters [J]. Journal of Shanghai Jiaotong University, 2017, 51(8): 1013-1017.
[5]	DAI Zhi-shuang, WANG Hong-xuan, LU Cheng-lin, SONG Ping-na, CHEN Xing, YUAN Xiao-yan. Creep Behaviors of HDPE Applied in Composite Flexible Pipes [J]. Ocean Engineering Equipment and Technology, 2016, 3(2): 135-139.
[6]	ZHAO Bing, CHEN Wujun, HU Jianhui, QIU Zhenyu, SONG Hao, CAI Jing. Experimental and Numerical Investigations of FormDevelopment of Ethylene-Tetrafluoroethylene Cushion Based on FlatPatterning [J]. Journal of Shanghai Jiao Tong University, 2016, 50(03): 377-383.
[7]	LI Chun,CHEN Wujun,HE Shizan. Experimental Study of Uniaxial Tensile Mechanical Properties of Fluorinated Ethylene Propylene Foils [J]. Journal of Shanghai Jiaotong University, 2016, 50(01): 72-77.
[8]	WU Zhijian1,2,3,CHEN Tuo4，MA Wei5. Analysis of LongTerm Deformation of Railway Embankment at Repeated Train Load in Permafrost Regions [J]. Journal of Shanghai Jiaotong University, 2015, 49(07): 929-934.
[9]	WANG Jianmei,XUE Yawen,CAI Min. Creep Life of Babbitt ZChSnSb11-6 of OilFilm Bearing [J]. Journal of Shanghai Jiaotong University, 2015, 49(01): 62-66.
[10]	ZHANG Dong-dong (张冬冬), SONG Chun-yu* (宋春雨), CHEN Long-zhu (陈龙珠). Numerical Evaluation of Land Subsidence Induced by Dewatering in Deep Foundation Pit [J]. Journal of shanghai Jiaotong University (Science), 2013, 18(3): 278-283.
[11]	CHEN Yongjiang,TANG Wencheng. Prediction of Friction Torque of Ball Screws Using a Creep Force Model [J]. Journal of Shanghai Jiaotong University, 2013, 47(09): 1335-1340.
[12]	ZHOU Kunpeng1a,WANG Yingyi1b,ZHU Jiwen2,HUANG Xingchun1a,1b. Analysis of Deformation Properties of Subway Station Foundation Pit in Soft Soil with High Creep Property [J]. Journal of Shanghai Jiaotong University, 2013, 47(09): 1413-1418.
[13]	WAN Xiao-feng (万晓峰), NI Hong-jun (倪红军), HUANG Ming-yu (黄明宇). Improvements of Elevated Temperature Strength and Creep Resistance of Mg-12Zn-4Al Based Alloy with Calcium Addition [J]. Journal of shanghai Jiaotong University (Science), 2012, 17(3): 273-276.
[14]	YANG Chui-Jin, CHEN Ju-Bing. The Constitutive Relationship of Elevated Temperature Creep of 40Cr Steel [J]. Journal of Shanghai Jiaotong University, 2012, 46(02): 301-305.