波浪荷载下钙质砂孔压增长特性的试验研究
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摘要
利用土工静力-动力液压三轴-扭剪多功能剪切仪模拟海洋波浪的加载形式,对相对密度为30%的钙质砂进行扭转和竖向加载耦合循环剪切试验,着重研究波浪荷载作用下主应力方向连续旋转及初始主应力方向角α0对饱和钙质砂孔隙水压力增长特性的影响。结果表明,主应力方向的连续旋转导致了钙质砂中孔隙水压力的增长。初始主应力方向和动应力幅值对钙质砂的孔压增长模式有显著的影响;归一化后的孔隙水压力比与广义剪应变之间的关系可以用双曲线表示。
The soil static and dynamic universal triaxial and torsional shear apparatus which can simulate the cyclic stress characteristic of ocean wave were used to perform experimental tests on loose carbonate sands with a relative density of 30% subjected to vertical-and-torsional coupling cyclic shear.The tests were carried out to investigate the effects of the continuous rotation of principal stress and the rotation angle of initial principal stress α_0 on the development pattern of pore water pressure of saturated carbonate sand under wave loads.It was showed that the continuous rotation of principal stress induced the development of pore water pressure in carbonate sand.The initial orientation of principal stress and the amplitude of cyclic shear stress affected the development pattern of pore water pressure significantly.The results also showed that the relationship between the normalized pore water pressure and the generalized strain fit the bilinear model.
The soil static and dynamic universal triaxial and torsional shear apparatus which can simulate the cyclic stress characteristic of ocean wave were used to perform experimental tests on loose carbonate sands with a relative density of 30% subjected to vertical-and-torsional coupling cyclic shear.The tests were carried out to investigate the effects of the continuous rotation of principal stress and the rotation angle of initial principal stress α_0 on the development pattern of pore water pressure of saturated carbonate sand under wave loads.It was showed that the continuous rotation of principal stress induced the development of pore water pressure in carbonate sand.The initial orientation of principal stress and the amplitude of cyclic shear stress affected the development pattern of pore water pressure significantly.The results also showed that the relationship between the normalized pore water pressure and the generalized strain fit the bilinear model.
引文
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[3]沈瑞福,王洪瑾,周景星.动主应力轴连续旋转下砂土的动强度[J].水利学报,1996,(1):27-33.
[4]Seed H B,Lee K L.Liquefaction of Saturated Sand During Cyclic Loading[J].Proc ASCE J SMFD,1996,92(sm6):105-134.
[5]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利电力出版社,1996.
[6]李万明,周景星.初始主应力偏转对粉土动力特性的影响[A].第四届全国土动力学学术会议论文集[C].杭州:浙江大学出版社,1994.47-50.
[7]王洪瑾,马奇国,周景星,等.土在复杂应力状态下的动力特性研究[J].水利学报,1996,(4):57-72.
[8]付磊,王洪瑾,周景星.主应力偏转角对砂砾料动力特性影响的试验研究[J].岩土工程学报,2000,(4):435-440.
[9]郭莹,栾茂田,何杨,等.复杂应力条件下饱和松砂孔隙水压力增长特性的试验研究[J].地震工程与工程振动,2004,(6):139-144.
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