Experimental Study on the Evolution of Dynamic Pore Pressure and Unidirectional and Bidirectional Vibrations of Phosphogypsum

Under seismic action, the stock of phosphogypsum (PG) affects security risk significantly, so it is crucial to study dynamic characteristics PG. In this article, unidirectional and bidirectional vibration tests on typical PG in Yunnan under different consolidation-confining pressure conditions were carried out using a triaxial apparatus that can be used for vibration. The results show pore growth both vibrations has obvious stages fitted by BiDoseResp function. strength does not increase monotonically with stress same cyclic ratio (CSR) but varies specific critical condition. decreases significantly CSR vibrations. number required liquefaction much larger than conditions, specimens have significant softening after provide theoretical references studying stability reservoirs action.