冻土动荷载直剪仪的研制  

Development of dynamic load direct shear apparatus for frozen soils

作　　者：崔颖辉[1] 刘建坤[1] 吕鹏[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2013年第S2期486-490,共5页Rock and Soil Mechanics

基　　金：国家基础研究973计划(No.2012CB026104);国家自然科学基金(No.41171064);中央高校基本科研业务费专项资金资助(No.2011JBZ009)

摘　　要：冻土的动力学参数是工程设计的重要依据之一,也是数值模拟时不可或缺的因素,动力学参数的正确与否直接影响了工程设计和数值模拟的正确性。通过分析其他学者做过的冻土动荷载三轴试验,以及参考普通直剪仪器的构造,北京交通大学冻土室研制了一种新型的冻土动荷载直剪仪,该仪器将传统直剪仪的水平静载部分改造为能够提供动荷载作动器,可以提供一个0.1~6 Hz、20kN以内的动荷载,用于测定冻土的动力学参数。介绍了动荷载直剪仪的结构组成、动力系统、测控系统等,并详细分析了仪器框架、直剪盒、动荷载作动器等的参数选取方法。最后使用该仪器进行了一组验证试验,试验结果表明,动荷载直剪仪能够完成其设计目的,可以测量出冻土在动荷载下的应力-应变曲线,从而求出动弹性模量、动阻尼比等,为冻土的动力学参数测定开辟了一条新的道路。The dynamic parameters of frozen soils is one of the important bases of engineering design, also the indispensable factor for the numerical calculation. The dynamic parameters directly affect the correctness of engineering design and numerical simulation. By analyzing the dynamic load triaxial test, and with reference to the structure of ordinary direct shear apparatus, Beijing Jiaotong University developed a new dynamic load direct shear apparatus. The apparatus used dynamic load actuator instead of the traditional direct shear apparatus's static load part, which can provide a 0.1-6 Hz, 0-20 kN dynamic load. Power systems, measurement and control systems of the dynamic load direct shear apparatus are analyzed;and the parameter selection of instrument frame, direct shear box, dynamic load actuators and so on are analyzed. Finally, by using the apparatus, a set of validation experiments have been carried out. The results show that the dynamic load direct shear apparatus can complete its purpose; stress-strain curve of frozen soils under dynamic loading can be measured, so as to open up a new way for determining kinetic parameters of frozen soils.

关 键 词：冻土 动荷载 直剪仪 动力参数 

分 类 号：TU415[建筑科学—岩土工程]