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介绍了一种既能够在现场测试原位土体强度又能在室内测试原状土样、重塑土样的便携式现场和室内两用直剪仪。该直剪仪包括取样设备、移动式垂直加压系统和水平张拉受剪系统。采用水平张拉受剪系统克服了常规直剪试验仪中刚性顶推方式所产生的剪切盒内壁摩擦力影响问题,采用移动式垂直加压系统可确保剪切过程中垂直压力不会偏心。通过试验测试与工程应用,表明该试验仪的测试结果可信,精度能满足工程设计要求。该仪器结构简单,操作方便,便于搬运。
A portable on-site and in-home dual-purpose direct shear instrument is introduced, which can not only test the strength of soil in situ but also test the undisturbed soil samples and remolded soil samples indoors. The direct shear includes sampling equipment, a mobile vertical pressurization system and a horizontal tensioned shear system. The horizontal tensioned shearing system overcomes the problem of frictional force on the inner wall of the shearing box produced by the rigid pushing method in the conventional direct shear tester. The vertical pressure applying system ensures that the vertical pressure will not be eccentric during shearing. Through the test and engineering application, it shows that the test results of the tester are credible and the precision can meet the engineering design requirements. The instrument structure is simple, easy to operate, easy to handle.