20 MN大尺寸岩体三向五面试验系统研制与应用

doi:10.13722/j.cnki.jrme.2022.0552

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摘要为扩展高应力条件下大尺寸岩体类材料力学特性研究，中南大学和上海华龙测试仪器有限公司联合研制YJW–20000S型微机控制电液伺服三向五面加载试验系统，该试验系统能够实现大尺寸岩体试样的动静组合加载、单面及多面卸载测试，用以模拟在岩爆等复杂应力条件下岩体的力学行为。通过对400 mm×400 mm×400 mm的类岩试样进行真三轴疲劳扰动加卸载试验及三向五面试验，结果表明试验系统能够满足功能及准确可靠性的要求。基于该试验系统开展400 mm×400 mm×400 mm和400 mm×400 mm×800 mm两种大尺寸花岗岩的单轴压缩试验研究，分析大尺寸花岗岩试样的应力–应变曲线特征、应力阈值、尺寸效应和端部效应。结果表明：大尺寸花岗岩的4个应力阈值分别为初始微裂纹和微孔隙闭合应力(0.37 )、新生裂纹起裂应力(0.54 )、损伤应力(0.73 )、峰值强度( )，试验结果与小尺寸花岗岩的理论预测结果相一致；大尺寸花岗岩试样的单轴抗压强度值比基于尺寸效应规律得到的理论值更小；端部效应导致试样侧面横断面上的轴向应变呈现沿中心向两边逐渐减小的规律，并低于试样中部的轴向应变值；靠近试样侧面中心纵断面上，距离端部越远轴向应变值越小；靠近侧面的边界面上，距离端部越远轴向应变值反而越大。该系统为深入研究大尺寸岩体试样在复杂应力环境下的力学行为提供了一种可靠的技术。

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	赵庆雄1
	曹平1
	芦正强2
	林杭1
	刘涛影1
	李凯辉1
	刘智振 1

关键词 ：岩石力学, YJW&ndash, 20000S三向五面加载试验系统, 试验机分类, 大尺寸岩体, 单轴压缩, 端部效应, 尺寸效应

Abstract：The YJW–20000S microcomputer-controlled hydraulic servo three-directional five-surface loading test system was jointly developed by Central South University and Shanghai Hualong Testing Instrument Co.，Ltd.，to expand the study on mechanical properties of large-scale rock-like materials under high stress conditions. The static and dynamical combination loading，single-face and multi-face unloading tests of large-scale rock specimens can be performed by this system to simulate the mechanical behavior of rock under complex stress conditions such as rock burst. The system?s functionality and accuracy were confirmed through true triaxial fatigue disturbance loading and unloading tests and three-directional five-surface tests on a 400 mm × 400 mm × 400 mm rock-like sample. Uniaxial compression tests on two kinds of large-scale granite specimens，viz. 400 mm × 400 mm × 400 mm and 400 mm × 400 mm × 800 mm，were carried out using this test system. The stress-strain curve characteristics，stress thresholds，size effects and end effects of large-scale granite specimens were analysed. The results show that the four stress thresholds of the large-size granite are the initial microcrack and microporous closure stress(0.37 )，crack-initiation stress(0.54 )，crack-damage stress(0.73 ) and peak strength( )，consistent with the theoretical prediction results of small-scale granite. The compressive strength value of large-scale granite specimen is smaller than the theoretical value based on the size-effect law. Additionally，the axial strain on the transverse section of the specimen?s side gradually decreases from the centre to both sides due to the end effect，and is lower than that in the middle of the specimen. The axial strain value near the side boundary surface of specimen increases with the distance from the end. The farther away from the end，the smaller the axial strain value on the longitudinal section near the centre of the sample's side. Overall，this system can provide reliable technology for in-depth research on the mechanical behavior of large-scale rock specimens under complex stress environments.

Key words： rock mechanics YJW&ndash 20000S three-direction five-sided loading test system testing machine classification large-size rock mass uniaxial compression end effect size effect

引用本文:

赵庆雄1，曹平1，芦正强2，林杭1，刘涛影1，李凯辉1，刘智振 1. 20 MN大尺寸岩体三向五面试验系统研制与应用[J]. 岩石力学与工程学报, 2023, 42(8): 1847-1865.
ZHAO Qingxiong1，CAO Ping1，LU Zhengqiang2，LIN Hang1，LIU Taoying1，LI Kaihui1，LIU Zhizhen1. Development of 20 MN large-scale rock mass three-direction five-surface#br# test system and its application. , 2023, 42(8): 1847-1865.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0552 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I8/1847

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