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本文说明在沙页岩地层上进行软弱夹层剪切试验时,采用了限制夹泥膨胀和防止夹泥受载挤出的措施.并研究了合理测定法向刚度系数(K_n)和剪切刚度系数(K_s)的方法. 由于防止了夹泥松弛,膨胀和结构扰动,提高了夹泥层的法向加载能力.正确地反映了法向载荷下的压缩特性和剪应力位移曲线.可以看到明显的峰值强度,并在绝大多数情况下获得了残余强度. 作者推荐的外锚筋固定法限制夹泥膨胀,用聚脂泡沫塑料板封闭剪切缝,效果甚为显著,但是为获得剪切载荷下的位移稳定值,需要增设稳压设备.
In this paper, we describe the use of methods to limit the expansion of the sludge and to prevent the squeezed clay from carrying out shear tests on weak shales in sandy shale formations. We have also studied the reasonable determination of the normal stiffness coefficient (K_n) and the shear stiffness coefficient. (K_s) method. Because of the prevention of loosening, expansion and structural disturbance of the clay, the normal loading capacity of the clay layer is improved. The compression characteristics and the shear stress displacement curve under normal load are correctly reflected. It can be seen clearly. The peak strength, and in the vast majority of cases, the residual strength is obtained. The external anchorage fixing method recommended by the authors limits the expansion of the sludge and closes the shear joints with polyester foam panels. The effect is significant, but for obtaining shear Stable displacement under load requires additional voltage regulator equipment.