砾性土动三轴液化试验橡皮膜顺变性补偿新方法  

New method to compensate for membrane compliance in dynamic triaxial liquefaction tests on gravelly soils

作　　者：王鸾[1,2] 孙锐 刘荟达[1,2,3] 袁晓铭 汪云龙[1,2] WANG Luan;SUN Rui;LIU Hui-da;YUAN Xiao-ming;WANG Yun-long(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,China;China Construction Infrastructure Corp.,Ltd.,Beijing 100044,China)

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080 [2]中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [3]中国建设基础设施有限公司,北京100044

出　　处：《岩土工程学报》2020年第12期2281-2290,共10页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局工程力学研究所基本科研业务费专项项目(2019EEEVL0201);黑龙江省自然科学基金重点项目(ZD2019009);国家自然科学基金项目(41602321)。

摘　　要：橡皮膜顺变效应对砾性土动三轴液化试验结果影响显著,采用试样注水补偿是消除橡皮膜顺变效应的基本手段。论证现有补偿方法的原理与技术缺欠,提出橡皮膜顺变性补偿新原理及新方法。通过多种含砾量砾性土大尺寸动三轴液化试验,结合橡皮膜嵌入体积测量,以能够考虑橡皮膜顺变性计算修正后孔压发展结果为参照,对新补偿方法可行性与可靠性进行对比验证。研究表明,现有补偿原理仅以动力导致橡皮膜回弹水作为总补水体积,将导致补偿不足,新补偿原理考虑了补偿过程中橡皮膜分流作用,更科学合理;在不同含砾量、不同振次条件下动三轴液化试验中,新补偿方法所得结果与理论计算相符,变化规律一致;相比现有补偿方法,新方法在单次补偿阶段无需反复补水和多回合逼近,可操作性明显增强,补偿效果明显占优。新方法操作简捷高效易推广,不仅适于砾性土动三轴液化试验,也为粗粒土动力特性试验研究提供了新的技术支撑。The membrane compliance has a significant effect on the results of the triaxial liquefaction tests.The compensation method is one of the primary means to eliminate the impact of the membrane.The theoretical defects of the existing compensation methods are analyzed and verified in the comparison tests,and the new principle and method for the compensation of membrane compliance are proposed.Based on the large-scale dynamic triaxial liquefaction tests on the gravelly soils with various gravel contents and the measurement of membrane penetration volume,the feasibility and reliability of the new compensation method are verified by taking the modified pore pressure model,which can consider the membrane compliance as a reference.The research shows that the existing compensation principle will lead to inadequate compensation,which only uses the rebound water volume caused by the dynamic force as the total water supplement volume,and the new compensation principle is more scientific and reasonable,considering the effect of membrane distributary.In the dynamic triaxial liquefaction tests with different gravel contents and stresses,the results of the new method are consistent with the theoretical ones,and the variation law is uniform.Compared with the existing compensation method,the new method does not need repeated water replenishment and multiple approximations at a single compensation stage,and its operability is enhanced,and the compensation effect is superior.It is suitable for the dynamic triaxial liquefaction tests on gravelly soils and provides a new technical support for the dynamic characteristics tests on coarse-grained soils.

关 键 词：砾性土 橡皮膜顺变性 补偿方法 计算修正 液化试验 

分 类 号：TU43[建筑科学—岩土工程]