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| Experimental study of pore pressure model of soft clay under cross-river subway loading |
| DING Zhi1，ZHUANG Jiahuang2，WEI Xinjiang1，KONG Bowen3，MA Shaojun4 |
| (1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；2. Guangzhou Metro Design and Research Institute Co.，Ltd.，Guangzhou，Guangdong 510030，China；3. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；4. Zhejiang Province Institute of Architectural Design and Research，Hangzhou，Zhejiang 310006，China) |
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Abstract Many cross-river subways are often constructed in deep soft soil layers，and the frequent changes of the warp soil above and the water level is a disadvantage to the control of the post-construction settlement. Therefore，the safety of cross-river subway is a challenge to control the post-construction settlement. Therefore，the safety of cross-river subway is undermined when it starts running. In this paper，the bidirectional dynamic triaxial test was operated by trial and error to stimulate the loading of cross-river subway on soft clay sample. The changing curve of pore pressure through dynamic test could be plotted，and a pore pressure model of soft clay under cross-river subway loading can be built. The study shows that：Under cross-river subway loading，the growing of pore pressure is firstly rapid，then slows down and stable. Increasing the effective confining pressure during cyclic loading make the pore water pressure rise，the stability value of pore water pressure will increase with the increase of radial cyclic stress ratio. The quadratic logarithmic model can be used to simulate the pore pressure development of soft clay under cyclic loading. The model takes the effects of radial cyclic stress ratio and effective confining pressure into consideration，which can provide as a reference for post-construction settlement prediction of cross-river subway.
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2020, Vol. 39 
