大型智能控制压扭多轴加载试验机的研制

Development of a Large-scale Computer-controlled Compression-torsional Multi-axial Loading Apparatus

设计和研制一台大型智能控制压扭多轴加载试验机,形成一个集动静加载、扭剪、常规三轴等功能为一体的多功能土动力试验平台。该试验机具有如下特点:(1)试样尺寸大,高度可达600mm,且可根据试验需求更换大小不同的试样及相应传感器;(2)加载自由度多,可独立施加轴力、扭矩、内压、外压、孔压及相应的位移,实现5个不同物理量的独立控制,从而大大拓宽可施加的应力路径范围;(3)控制智能化,可先将拟进行的应力路径或应变路径写入程序中,试验过程中即可由计算机自动控制。测试结果表明,该试验机的控制精度能够满足土工材料试验的要求。

A new large-scale, computer-controlled, compression torsional multi-axial loading ap- paratus has been designed, developed, and tested. This apparatus integrates many geotechnical testing functions, such as cyclic triaxial and cyclic torsional shear. This apparatus has three main characteristics. First, it features specimens of two different sizes, which can be chosen according to the experimental requirements. The height of the larger specimen reaches 600 ram. Second, the loading degrees of freedom, including axial force, torque, inner pressure, outer pressure, pore pressure, and related displacements, can be controlled separately, which is useful in the study of soil behavior under complicated stress paths. Finally, the stress or strain path can be prepro- gramed into the computer before conducting tests and can also be controlled automatically during the tests. Test results show that the control accuracy of the apparatus can meet the requirements of geotechnical material tests.