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一、前言一般说,土都不是理想的均质体,它具有各向异性,并且往往含有裂纹,裂隙和裂缝等不连续面,或者有软弱夹层。尤其是对裂隙粘土来说更是如此。因此,用直剪仪进行剪切试验不能完全反映土的上述特性,往往得出偏高的强度指标,因为直剪仪的剪切破裂面人为地控制在上下盒之间,因此导致破坏不能沿强度较低的面进行。为此,方晓阳和赫斯特(Hirst)在1973年首先提出了用无侧限抗压——轴向压裂试验(以下简称压——拉试验)确定抗剪强度参数的方法。这种方法试验设备简单,操作简便,比三轴
I. INTRODUCTION Generally speaking, soil is not an ideal homogenous body. It has anisotropy and often contains discontinuous surfaces such as cracks, crevices and cracks, or weak interlayers. This is especially true for fractured clays. Therefore, the shear test with direct shear instrument can not fully reflect the above characteristics of soil, often leads to high strength indicators, because the shear rupture surface of the direct shear instrument is artificially controlled between the upper and lower boxes, so the damage can not be along The lower intensity surface is performed. To this end, Fang Xiaoyang and Hirst first proposed in 1973 the method of determining the shear strength parameters using the unconfined compression-axial fracture test (hereinafter referred to as the pressure-pull test). This method test equipment is simple, easy to operate, than three axes