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中文摘要：
饱和砂土中振动孔压波动特性的研究是建立瞬态孔隙水压力模型的基础。为了研究振动孔压的波动特性,对细粒含量为0%,5.0%,13.5%的饱和南京细砂试样,分别施加频率为0.5,1.0,5.0 Hz的正弦波荷载,进行了局部排水条件下的应力控制循环三轴试验。定量分析试验得到：①当正弦波荷载频率为0.5 Hz,渗透系数为1.35×10-3 cm/s（细粒含量0%）时,振动孔压的波动反应超前轴向应变反应的相位角接近于90°,而与轴向应变率反应同步。②随着正弦波荷载频率的增大或渗透系数的减小,振动孔压的波动反应超前轴向应变反应的相位角逐渐减小,滞后于轴向应变率反应的相位角逐渐增大。基于饱和固液两相介质理论,建立了适用于任意排水边界条件的振动孔压方程。该方程不仅能解释不排水条件下振动孔压波动反应与轴向应变反应同步的现象,也能解释局部排水条件下振动孔压波动反应超前轴向应变的现象。
英文摘要：
The fluctuating characteristics of excess pore water pressure（EPWP） are the basics to establish the transient EPWP model.A series of stress-controlled cyclic triaxial tests are carried out for saturated Nanjing fine sand with various fine contents of samples and loading frequencies.The loading frequencies are 0.5 Hz,1.0 Hz and 5.0 Hz,and the fine content of samples are 0%,5.0% and 13.5%.Based on quantitative analysis of the test results,it is found that：（1） When the cyclic load of 0.5 Hz frequency is applied on the samples with fine particles of 0% and permeability of 1.35×10-3 cm/s,the leading-phase angle between EPWP’s response and axial strain’s response is approaching 90 degrees,and the EPWP’s response is simultaneous with the axial strain-rate’s response;（2） With the increase of loading frequency or the decrease of permeability of samples,the leading-phase angle between EPWP’s response and axial strain’s response decreases,and that between EPWP and axial strain-rate increases.Based on the theory of saturated porous media,an EPWP equation for any drainage bound condition is established.The proposed equation can explain the phenomena of the EPWP’s response being simultaneous with the axial strain’s response in undrained condition,and also that of EPWP’s response leading axial strain’s response under partially drained conditions.
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