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| A prediction model of dynamic pore water pressure for MICP-treated calcareous sand |
| LIU Hanlong1，2，ZHANG Yu1，2，GUO Wei3，XIAO Peng1，4，HUANG Ming5，CHU Jian6，XIAO Yang1，2 |
(1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. Key Laboratory of New Technology for Construction of Cities in Mountain Area，Chongqing University，Chongqing 400045，China；3. School of Civil Engineering，
Tianjin University，Tianjin 300072，China；4. Chongqing Railway Investment Group Co.，Ltd.，Chongqing 400023，China；
5. College of Civil Engineering，Fuzhou University，Fuzhou，Fujian 350116，China；6. School of Civil and
Environmental Engineering，Nanyang Technological University，Singapore 639798，Singapore) |
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Abstract The calcareous sand foundation may be liquefied to cause structural damages under dynamic loadings such as earthquakes and waves. The microbially induced calcite precipitation(MICP) can enhance the strength of the calcareous sand foundation on a large scale and improve its liquefaction resistance. In this paper，the dynamic pore pressure development of MICP-treated calcareous sand was studied through a series of cyclic triaxial tests，and the effects of the effective confining pressure，the dynamic stress ratio，the relative density and the biocementation level on the development of the dynamic pore water pressure of MICP-treated calcareous sand were investigated. It is found that the pore water pressure development of MICP-treated calcareous sand is greatly affected by the dynamic stress ratio and the biocementation level. Based on the dynamic stress ratio and the biocementation level，MICP-treated calcareous sand presents three different pore water pressure development patterns. The pore water pressure curve gradually transitions from S-type to hyperbolic type with increasing the dynamic stress ratio or the biocementation level. Based on the development of the dynamic pore water pressure，an uniform pore water pressure model was proposed for MICP-treated calcareous sand. The advantage of this model over other models in predicting the development of the dynamic pore water pressure in MICP-treated calcareous sand was demonstrated through comparisons.
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2021, Vol. 40 
