基于应力归还法的单轴拉伸伺服控制试验系统的研制与应用

发布时间：2018-03-09 23:17

  本文选题：直接拉伸　切入点：试验系统　出处：《岩土力学》2017年S1期 　论文类型：期刊论文

【摘要】：根据岩石广义应力松弛特性试验研究的需要,自主研制了基于应力归还法的单轴拉伸伺服控制试验系统。该系统的(1)实现了应力归还法控制,既能单独控制加载传统的位移、应力,也可伺服控制应力-应变线性组合;(2)测量、控制系统采用硬件实现而非计算机软件,结构简单紧凑,系统动作反应时间短,性能稳定可靠,升级改造空间大;(3)控制及监测数据均采用模拟信号传输,试验过程控制及数据采集精度均较高;(4)采用高强度粘接剂直接拉伸,使试件完全处于被拉伸状态,能更真实地模拟工程实际中岩体的受力状态。采用该试验系统,对田下凝灰岩进行了拉应力条件下的广义应力松弛试验,试验结果表明,其具有较好的实用性和可靠性,为研究工程实际中岩石受拉应力作用下的广义应力松弛力学性质提供了新的试验方法及手段。
[Abstract]:According to the generalized need of experimental research on stress relaxation characteristics of the developed stress return method of uniaxial tensile test. The servo control system based on the system (1) the stress return control, displacement, which can independently control the traditional loading stress, but also the linear combination of stress servo control strain; (2) measurement and control system using hardware rather than software, simple and compact structure, system action short reaction time, stable and reliable performance, upgrade large space; (3) monitoring and control data were simulated using the signal transmission, test process control and data acquisition accuracy; (4) the high strength direct tensile adhesive, the specimen is completely stretched, can more accurately simulate the stress state of rock mass in practical engineering. By using the test system, the generalized force under the condition of tensile stress relaxation test of tage tuff of The test results show that it has good practicability and reliability. It provides a new test method and method for studying the generalized stress relaxation mechanical properties of rock under tensile stress in engineering practice.

【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;中国葛洲坝集团易普力股份有限公司;中煤科工集团重庆研究院有限公司;东京大学工学系;
【基金】：国家自然科学基金(No.51304255,No.51474040) 中国博士后科学基金(No.2014M552323) 重庆市博士后资助项目(No.Xm2014037)~~
【分类号】：TU45
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本文编号：1590722