A modified commercial triaxial testing system for small strain measurements: preliminary results on Pisa clay
A modified commercial triaxial testing system for small strain measurements: preliminary results on Pisa clay
复制标题
用于小应变测量的改良商用三轴测试系统：比萨粘土的初步结果
DOI：
--
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
I. Puci
中科院分区：
文献类型：
--
作者：
H. Pincus;D. Presti;O. Pallara;I. Puci
改进了计算机控制的水力三轴单元，目的是：(1)在小应变下获得更好的土刚度测量精度，(2)可靠的K0固结自动程序，以及(3)在系统饱和和试件固结过程中最小的干扰。为了达到上述目标，进行了多次修改。改进了单元结构和加载活塞，引入了多种传感器，包括用于局部径向和轴向应变测量的ldt。最后，开发控制软件，实现以下测试流程：(1)干定型；(2)通过应力控制冲洗系统饱和，避免膨胀和背压；(3)通过局部测量控制零径向应变，实现K0固结。本文将有利于那些有兴趣升级现有的液压三轴系统内部以经济的方式。
A computer-controlled hydraulic triaxial cell was modified with the aim of obtaining (1) a better measuring accuracy of soil stiffness at small strains, (2) a reliable automatic procedure for K0 consolidation, and (3) a minimum disturbance during system saturation and specimen consolidation. To obtain the above objectives, many modifications were introduced. The cell structure and loading piston were modified and many transducers were introduced, including the LDTs for local radial and axial strain measurement. Finally, control software was developed to achieve the following testing procedures: (1) dry setting, (2) system saturation by flushing with stress control to avoid any swelling and back pressurization, and (3) K0 consolidation with control of nil radial strain by means of local measurement. The paper will benefit those interested in upgrading an existing hydraulic triaxial system in-house in an economical manner.