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介绍了一种改装的便携式直剪仪,并用该仪器测试了不同形成时期、不同加载方式作用下大尺寸裂隙性黄土样的抗剪强度。结果显示在不同正应力作用下的剪应力-剪切位移曲线具有弱硬化型特点;近期形成的裂隙性黄土抗剪强度指标c和φ值比形成时间相对较早的裂隙性土样小;分级加载方式测得的内聚力比连续加载方式大,而内摩擦角比连续加载时小,但变幅不大;分级加载方式测得的内聚力比剪切带的分级加载方式大,但这两种方式对内摩擦角的影响不大。
A modified portable direct shear tester is introduced, and the shear strength of large-size fractured loess samples under different loading modes is tested by this instrument. The results show that the shear stress-shear displacement curves under different normal stresses have the characteristics of weak hardening. The shear strength index c and φ of the newly formed fissured loess are smaller than the fissured soil samples relatively earlier in formation time. The cohesive force measured by the loading method is larger than the continuous loading method, while the internal friction angle is smaller than the continuous loading, but the amplitude is not large. The cohesive force measured by the staged loading method is larger than the staged loading method, Little effect on the internal friction angle.