一、前言直接剪力仪是土的剪切试验最简单的仪器。我们常用的有应力控制式与应变控制式二种,试验结果相差很大,尤其以砂土为甚。为了能准确地测定土的抗剪强度,我们曾进行了一些比较试验,并且根据试验的结果试行改装,以便利用现有的仪器,节省购置新型仪器的 I. INTRODUCTION The direct shear instrument is the simplest instrument for soil shear testing. There are two types of stress control and strain control that we commonly use. The test results are quite different, especially in sandy soil. In order to accurately determine the shear strength of soil, we have conducted some comparative tests, and based on the results of the experiment, we tried to retrofit to make use of the existing instruments, saving the purchase of new types of instruments.