摘要
为深入探究复杂工程环境下岩石剪切力学行为和破坏机制,自主设计研制一套岩石双向动态循环剪切试验系统。该试验系统主要由主机加载系统、伺服油源系统、伺服控制系统、剪切工装系统和变形测量系统五部分组成。该试验系统的主要创新性如下:(1)可在法向和剪切方向以0.001~10Hz频率进行动态加载,同时实现切向位移、切向荷载、法向位移和法向荷载的混合加卸载控制,并通过双向剪切的方法确保试样法向中心恒定;(2)试验过程可采用载荷、油缸位移、变形传感器进行多速率多目标组合控制,以实现切向和法向方向上的动静态加载;(3)可实现恒定应力、恒定位移、恒定刚度、动载加载和自定义荷载形式等多个可控边界条件;(4)可对长×宽×高为200 mm×100 mm×100 mm或400 mm×200 mm×200 mm的大尺寸试样进行试验探究;(5)可同时探究剪切、锚固等多种工况组合下的耦合机制。通过该试验系统开展不同应力边界条件下的岩石剪切试验,验证该试验系统的可靠性与准确性。试验结果表明:所研制的岩石双向动态循环剪切试验系统能够满足岩石剪切力学行为的科研需求,系统操作方便,试验过程高效稳定,加载精度与试验数据精度高。该试验系统可为深部煤炭资源开采、巷(隧)道开挖建设、放射性核废料处置、震区边坡稳定性分析和地下能源封存等重大工程领域的研究提供重要平台。
To deeply investigate the shear mechanical behaviors and failure mechanisms of rock in the complex engineering environment,a bidirectional dynamic rock shearing test system was independently designed and developed.The test system is mainly composed of five parts:host loading system,servo oil source system,servo control system,shear tooling system and deformation measurement system.The main innovations of the test system are as follows:(1)Dynamic loading can be carried out in the normal and shear directions at a frequency of 0.001-10 Hz,and the mixed loading and unloading control of tangential displacement,tangential load,normal displacement and normal load can be realized simultaneously.The normal center of the sample can be kept constant by the method of bidirectional shear.(2)Load,cylinder displacement,and deformation sensors are used for multi-rate and multi-objective combination control to achieve tangential and normal dynamic and static loading in the test process;(3)Multiple controllable boundary conditions such as constant stress,constant displacement,constant stiffness,dynamic loading and customized load forms can be realized;(4)Large-size specimens with L×W×H=200 mm×100 mm×100 mm or 400 mm×200 mm×200 mm can be researched;(5)The coupling mechanism under various working conditions such as shearing and anchoring can be explored simultaneously.The reliability and accuracy of the test system were verified by carrying out rock shear tests under different stress boundary conditions with this test system.The test results indicate that the developed bidirectional rock joints dynamic shear test system can meet the scientific research needs of rock shear mechanical behavior.The system is easy to operate and the test process is efficient and stable.The loading accuracy and test data accuracy are high.The test system can provide an important platform for research in major engineering fields such as deep coal resource mining,roadway(tunnel)excavation and construction,radioactive nuclear waste disposal,slope stab
作者
张强
谷邱鑫
李涛
刘日成
李树忱
尹乾
徐鼎平
ZHANG Qiang;GU Qiuxin;LI Tao;LIU Richeng;LI Shuchen;YIN Qian;XU Dingping(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第8期1870-1882,共13页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(52074269,52379113)。
关键词
岩石力学
剪切试验
边界条件
动态加载
试验系统研制
rock mechanics
shear test
boundary conditions
dynamic loading
development of testing system
