加载速率影响下岩石试件破坏特性研究
发布时间：2018-11-21 19:49
【摘要】：论文以不同加载速率影响下岩石试件-试验机系统稳定性展开研究,分析率效应对岩石试件-试验机系统稳定性的具体影响,设计四组加载速率、两种不同强度岩石试件的力学试验,结果表明,随着加载速率的增加,两种岩石试件的峰值压力增大,压力降增大,但高强度试件峰值压力增加的更快、压力降更大；峰后阶段,加载速率越大、岩石试件的强度越高,岩石试件-试验机系统稳定性越低；岩石试件-试验机系统的反馈特性与岩石试件子系统的反馈状态及试验机子系统的刚度密切相关,若试验机刚度足够大,足以抵消岩石试件的负反馈状态的影响,则岩石试件-试验机系统处于负反馈状态；若试验机的刚度不够,不足以抵消岩石试件的负反馈状态的影响,则岩石试件-试验机系统处于正反馈状态。
[Abstract]:In this paper, the stability of rock test-tester system is studied under the influence of different loading rates. The specific effect of rate effect on the stability of rock test-tester system is analyzed, and four groups of loading rates are designed. The results of mechanical tests of two rock specimens with different strength show that the peak pressure and pressure drop increase with the increase of loading rate, but the peak pressure increases faster and the pressure drop increases with the increase of loading rate. At the post-peak stage, the higher the loading rate, the higher the strength of the rock specimen and the lower the stability of the rock-test-machine system. The feedback characteristics of the rock test-machine system are closely related to the feedback state of the rock specimen subsystem and the stiffness of the testing machine subsystem. If the stiffness of the tester is large enough to counteract the influence of the negative feedback state of the rock specimen, The rock test-testing machine system is in a negative feedback state. If the stiffness of the testing machine is not enough to counteract the influence of the negative feedback state of the rock specimen, the rock test-testing machine system is in a positive feedback state.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45
本文编号：2348099
[Abstract]:In this paper, the stability of rock test-tester system is studied under the influence of different loading rates. The specific effect of rate effect on the stability of rock test-tester system is analyzed, and four groups of loading rates are designed. The results of mechanical tests of two rock specimens with different strength show that the peak pressure and pressure drop increase with the increase of loading rate, but the peak pressure increases faster and the pressure drop increases with the increase of loading rate. At the post-peak stage, the higher the loading rate, the higher the strength of the rock specimen and the lower the stability of the rock-test-machine system. The feedback characteristics of the rock test-machine system are closely related to the feedback state of the rock specimen subsystem and the stiffness of the testing machine subsystem. If the stiffness of the tester is large enough to counteract the influence of the negative feedback state of the rock specimen, The rock test-testing machine system is in a negative feedback state. If the stiffness of the testing machine is not enough to counteract the influence of the negative feedback state of the rock specimen, the rock test-testing machine system is in a positive feedback state.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45
【参考文献】
相关期刊论文 前10条
1 吕志强;;加载速率对煤岩抗拉强度参数影响程度研究[J];煤炭技术;2014年10期
2 苏海健;靖洪文;赵洪辉;;高温后砂岩单轴压缩加载速率效应的试验研究[J];岩土工程学报;2014年06期
3 许金余;刘石;;加载速率对高温后大理岩动态力学性能的影响研究[J];岩土工程学报;2013年05期
4 纪文栋;杨春和;姚院峰;孔君凤;;应变加载速率对盐岩力学性能的影响[J];岩石力学与工程学报;2011年12期
5 张连英;茅献彪;;高温状态下加载速率对石灰岩力学效应研究[J];岩土力学;2010年11期
6 周杰;周国庆;赵光思;徐宾宾;李晓俊;;高应力下剪切速率对砂土抗剪强度影响研究[J];岩土力学;2010年09期
7 尹小涛;葛修润;李春光;王水林;;加载速率对岩石材料力学行为的影响[J];岩石力学与工程学报;2010年S1期
8 孔祥明;刘永亮;阎培渝;;加载速率对水泥沥青砂浆力学性能的影响[J];建筑材料学报;2010年02期
9 黄润秋;黄达;;高地应力条件下卸荷速率对锦屏大理岩力学特性影响规律试验研究[J];岩石力学与工程学报;2010年01期
10 陈勉;张艳;金衍;李良川;;加载速率对不同岩性岩石Kaiser效应影响的试验研究[J];岩石力学与工程学报;2009年S1期
相关会议论文 前1条
1 王来贵;潘一山;梁冰;章梦涛;;冲击地压的分叉分析[A];第四届全国岩石动力学学术会议论文选集[C];1994年
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