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| INFLUENCES OF GROUNDWATER LEVEL FLUCTUATION ON THE STABILITY OF GRAVITY RETAINING WALL OF PITS |
| YING Hongwei1，2，NIE Wenfeng3，HUANG Dazhong4 |
(1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China； 2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. Kunming Survey，Design and Research Institute Co.，Ltd. of CREEC，Kunming，Yunnan 650200，China；
4. Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China) |
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Abstract Groundwater level in coastal region fluctuates periodically due to wave or tides. The response of the pore pressures of the ground near the retaining wall is vital for pit excavation. In this study，a single layer ground with finite thickness around the pit to be excavated was considered to be isotropic and homogeneous. The fluctuating water level at the boundary was assumed to be a sinusoidal function. The seepage area around the pit was divided into three zones. Assuming the total stresses of soil keeping constant，the two-dimensional consolidation equations were decoupled. A semi-analytical solution of pore pressure of the ground around the pit with gravity retaining wall in response to the groundwater level fluctuation was derived with Laplace and Fourier transforms. The comparisons with the results from finite element software PLAXIS verified the proposed method. An example was presented to investigate the pore pressure response around the pit and its influence on the stability of the retaining wall via the above semi-analytical solution. The results show that the amplitude of pore pressure attenuated along the seepage path from the back to the front of the retaining wall，while the phase lag increased. The stability of the retaining wall fluctuates and has phase lags too as the groundwater level fluctuating.
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Received: 17 December 2013
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| [1] LI Y Q，YING H W，XIE K H. On the dissipation of negative excess porewater pressure induced by excavation in soft soil[J]. Journal of Zhejiang University Science，2005，6A(3)：188–193.
[2] 刘早云，李广信. 考虑渗透力的基坑水土压力计算[J]. 工业建筑，2002，32(9)：34–36.(LIU Zhaoyun，LI Guangxin. Computation of water and earth pressure in consideration of seepage[J]. Industry Construction，2002，32(9)：34–36.(in Chinese))
[3] HARR M E. Groundwater and seepage[M]. [S. l.]：MCGRAW-HILL Book Company，Inc.，1962：134–138.
[4] KAVVADAS M，GIOLAS A，PAPACHARALAMBOUS G. Drainage of supported excavations[J]. Geotechnical and Geological Engineering，1992，10(2)：141–157.
[5] 黄大中，谢康和，应宏伟. 渗透各向异性土层中基坑二维稳定渗流半解析解[J]. 浙江大学学报：工学版(待刊).(HUANG Dazhong，XIE Kanghe，YING Hongwei. Semi-analytical solution for two-dimensional steady seepage around the foundation pit in soil layer with anisotropic permeability[J]. Journal of Zhejiang University：Engineering Science，(to be pressed).(in Chinese))
[6] BALIGH M，LEVADOUX J N. Consolidation theory for cyclic loading[J]. Journal of geotechnical Engineering，1978，104(2)：415–431.
[7] 栾茂田，钱令希. 层状饱和土体一维固结分析[J]. 岩土力学，1992，13(4)：45–56.(LUAN Maotian，QIAN Lingxi. One-dimension consolidation analysis of layered saturated soils[J]. Rock and Soil Mechanics，1992，13(4)：45–56.(in Chinese))
[8] 谢康和. 双层地基一维固结理论与应用[J]. 岩土工程学报，1994，16(5)：24–35.(XIE Kanghe. Theory of one-dimension consolidation of double-layered ground and its applications[J]. Chinese Journal of Geotechnical Engineering，1994，16(5)：24–35.(in Chinese))
[9] 蔡袁强，徐长节. 循环荷载下成层饱水地基的一维固结[J]. 振动工程学报，1998，11(2)：184–193.(CAI Yuanqiang，XU Changjie. One- dimension consolidation of layered and saturated soils under cyclic loading[J]. Journal of Vibration Engineering，1998，11(2)：184–193. (in Chinese))
[10] CONTE E，TRONCONE A. Soil layer response to pore pressure variations at the boundary[J]. Geotechnique，2008，58(1)：37–44.
[11] HSU J R C，JENG D S. Wave-induced soil response in an unsaturated anisotropic seabed of ?nite thickness[J]. International Journal of Numerical and Analytical Methods in Geomechanics，1994，18(5)：785–807.
[12] MASE H，SAKAI T，SAKAMOTO M. Wave-induced pore water pressure and effective stresses around breakwater[J]. Ocean Engineering，1994，21(4)：361–379.
[13] KUMAGAI T，FODA M A. Analytical model for response of seabed beneath composite breakwater to wave[J]. Journal of Waterway，Port，Coastal and Ocean Engineering，2002，128(2)：62–71.
[14] 应宏伟，聂文峰，黄大中. 地下水位波动下基坑周围地基土的孔压响应半解析解[J]. 岩土工程学报，2014，36(6)：1 012–1 019.(YING Hongwei，NIE Wenfeng，HUANG Dazhong. Semi-analytical solution of pore pressure response around excavation to groundwater level fluctuation[J]. Chinese Journal of Geotechnical Engineering，2014，36(6)：1 012–1 019.(in Chinese))
[15] 应宏伟，聂文峰，王啟铜，等. 水位波动对临海重力式挡墙基坑稳定性的影响[J]. 海洋工程，2013，31(4)：48–54.(YING Hongwei，NIE Wenfeng，WANG Qitong，et al. Effect of water level fluctuation on stability of excavation with gravity retaining wall by the sea[J]. The Ocean Engineering，2013，31(4)：48–54.(in Chinese))
[16] 聂文峰. 水位波动条件下基坑周围地基土的孔压响应[硕士学位论文][D]. 杭州：浙江大学，2013.(NIE Wenfeng. Pore pressure response in soil around excavation subjected to water level fluctuation[M. S. Thesis][D]. Hangzhou：Zhejiang University，2013.(in Chinese)) |
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2014, Vol. 33 
