Soil Strees-Strain Characteristics Using an Automated True Triaxial Testing Device

小行星9452059 一个自动化的电动气动控制的真三轴试验装置与灵活的边界，使学生能够研究的重要性，应力路径和排水条件的强度土壤。两种类型的实验室实验，使用这种设备已经开发。第一部分使学生熟悉与静态传感器校准、模数转换、信号调理、软件和硬件增益以及混叠问题相关的概念。第二种类型涉及各向同性和各向异性固结以及使用预定义的应力路径对土样进行测试。可以进行应力和应变控制的静态剪切测试，并且基本上可以通过数据采集和控制软件模拟任何应力路径。这种实验室能力显示了使用同一测试装置进行的各种实验室强度测试与实际现场条件的相关性，并说明了与电子数据采集和控制有关的概念。一个重要的好处是，相同的设备可以用来说明排水和不排水的应力-应变特性的各向同性和Ko固结土样。可以在预定义的应力路径下剪切样品，并且可以比较观察到的孔隙压力行为（对于不排水测试）。土壤测试程序的开发，以检查有关的问题，类型的固结，应力路径和加载速率。

9452059 Penumadu An automated electro-pneumatic controlled true triaxial testing device with flexible boundaries enables students to investigate the importance of stress path and drainage conditions on the strength of soils. Two types of laboratory experiments that use this device have been developed. The first familiarizes students with concepts related to static transducer calibration, analog to digital conversion, signal conditioning, software and hardware gain and problems of aliasing. The second type deals with the isotropic and anisotropic consolidation and testing of soil samples using a predefined stress path. Stress and strain controlled static shear tests can be performed and essentially any stress path can be simulated through the data acquisition and control software. This laboratory capability shows the relevance of the various laboratory strength tests with actual field conditions using the same testing device, and illustrates the concepts related to electronic data acquisition and control. An important benefit is that the same device can be used to illustrate the drained and undrained stress-strain characteristics of both isotropic and Ko consolidated soil samples. The samples can be sheared under a predefined stress path and the observed pore pressure behavior (for undrained testing) can be compared. Soil testing programs are developed to examine the issues related to type of consolidation, stress path and the rate of loading.