中文摘要：

岩石材料不同形状接触面的静动力学特性是岩石力学研究重点。接触面力学特性研究的一个基本途径是通过接触面基本力学特性试验。为了得到稳定的岩体结构面抗剪强度,需要对不同尺寸的岩体结构面试样进行抗剪强度直剪试验。以现有直剪仪为基础,提出新设备的液压系统和控制方案,并对直剪仪法向力和剪切力的控制精度和方法等问题进行了分析。试验测试表明：该试验仪的测试结果可信,精度能满足工程设计要求。文中的研究为岩石试验提供了大压力范围、柔性控制的仪器设备,为测试试样的剪胀和尺寸效应提供装备。

英文摘要：

The key research of rock mechanics is static or dynamic behavior between rock materials with various shapes of contact surface. The basic approach of the contact surface mechanics property research is through the contact surface basic mechanics property test. To get steady shear strength of rock joints,shear strength of different size of samples need be tested. Hydraulic system and control scheme of a new device were introduced based on existent direct shear apparatus. At the same time,control accuracy and methods of normal force and shear force were analyzed. The accuracy was validated by several laboratory and in-situ experiments. It meets engineering design demand. The research provides large pressure range and flexible control apparatus in testing stress-dilation and size effect of sample.