饱和砂卵石土液化特性的试验研究
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摘要
通过动三轴试验,对饱和砂卵石土在循环荷载下的液化特性进行了系统研究。在饱和砂卵石土的振动时程曲线分析基础上,得到饱和砂卵石土的动应力幅值随振动时间推移有衰减且衰减速率逐渐增大的规律特性;依据孔压演化理论,结合试验结果,对饱和砂卵石土的液化规律进行了系统分析,归纳出砂卵石土发生液化时含水量限制条件,与液化状态中的土样动应变状态的规律。此结论可为基础工程等土工构筑物抗液化措施提供参考。
Through dynamic triaxial test,liquefaction properties of saturated sandy pebble soil under cyclic loading were systematically studied.Based on the analysis of vibration time history curve of the saturated sandy pebble soil,the law that dynamic stress amplitude of the saturated sandy pebble soil attenuates gradually with vibration time's development is obtained.According to the evolutionary theory of pore pressure and the test results,the limiting condition of water content of sandy pebble soil is induced when it initially liquefies,and the law of dynamic strain situation of soil sample is also obtained.This conclusion can offer reference for anti-liquefaction of foundation engineering and other earth structures.
Through dynamic triaxial test,liquefaction properties of saturated sandy pebble soil under cyclic loading were systematically studied.Based on the analysis of vibration time history curve of the saturated sandy pebble soil,the law that dynamic stress amplitude of the saturated sandy pebble soil attenuates gradually with vibration time's development is obtained.According to the evolutionary theory of pore pressure and the test results,the limiting condition of water content of sandy pebble soil is induced when it initially liquefies,and the law of dynamic strain situation of soil sample is also obtained.This conclusion can offer reference for anti-liquefaction of foundation engineering and other earth structures.
引文
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[3]李广信.高等土力学[M].清华大学出版社,2004.
[4]粉质壤土动三轴试验分析[A].第五届全国土动力学学术会议论文集[C].大连:大连理工大学出版社,1998:176~180.
[5]Seed H B and Idriss I M.Soil Moduli and Damping Factors forDynamic Response Analysis,Report No.EERC 70~10[J].Earthquake Engineering Research Center.University of CaliforniaBerkeley.1970:1329~1334.
[6]周键,白冰,段瑞明.粉煤灰作为筑坝排水垫层的动力特性试验研究[J].勘察科学技术,2000,21(5):7~11.
[7]周云东.砂土地震液化大变形研究[D].南京:河海大学,2003:1~2.
[8]张克昌.含泥砂砾的强度特性[J].岩土工程学报,1985,7(6):51~59.
[9]刘雪珠.南京及其临近地区新近沉积土的动力特性和砂土震动液化试验研究[D].南京:南京工业大学,2003:44~45.
[2]赵跃平,苏森.成都地区砂卵石土地基承载力的研究[J].四川建筑,1993,12(2):14~18.
[3]李广信.高等土力学[M].清华大学出版社,2004.
[4]粉质壤土动三轴试验分析[A].第五届全国土动力学学术会议论文集[C].大连:大连理工大学出版社,1998:176~180.
[5]Seed H B and Idriss I M.Soil Moduli and Damping Factors forDynamic Response Analysis,Report No.EERC 70~10[J].Earthquake Engineering Research Center.University of CaliforniaBerkeley.1970:1329~1334.
[6]周键,白冰,段瑞明.粉煤灰作为筑坝排水垫层的动力特性试验研究[J].勘察科学技术,2000,21(5):7~11.
[7]周云东.砂土地震液化大变形研究[D].南京:河海大学,2003:1~2.
[8]张克昌.含泥砂砾的强度特性[J].岩土工程学报,1985,7(6):51~59.
[9]刘雪珠.南京及其临近地区新近沉积土的动力特性和砂土震动液化试验研究[D].南京:南京工业大学,2003:44~45.
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