基于多级荷载试验的岩石损伤模量探讨

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摘要根据《工程岩体试验方法标准》(GP/T50266—1999)中建议的岩石单轴压缩试验加载速率，并结合天然气储库注气、采气循环过程的运营状态，利用MTS815 Flex Test GT岩石力学试验系统，以大理岩作为对比岩石，对作为天然气储库围岩的盐岩损伤卸载模量，进行单轴压缩加卸载试验和单轴压缩低周循环荷载试验研究；试验加载采用轴向荷载控制，每个试件均按7级不同应力幅值加卸载；低周循环荷载试验采用轴向荷载的正弦波控制加载，其频率为1.0 Hz，控制每级动荷载下的振动周次不低于30个循环。研究得到盐岩应力–应变滞回环均为条带状，在加卸载转折部位具有较大不可逆变形，对应弹性响应较慢；大理岩则均为尖叶状，在加卸载处对应弹性相应较快；盐岩的卸载模量测试得到的变化趋势在加卸载和低周循环荷载下相反，而大理岩测试结果则相同，并均随应力增加递减。测试结果表明，应力幅值的大小较循环周次的多少对盐岩不可逆变形增量的影响更加显著，研究得到储库运营中盐岩的损伤演化特征。

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	刘建锋
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关键词 ：岩石力学, 盐岩, 损伤变量, 卸载模量, 黏塑性变形

Abstract：According to the propositional loading speed for axial compression test in Standards for Tests Method of Engineering Rock Masses(GP/T50266—1999) and the operational status of natural gas store cavern during gas injection and production fatigue cycles，the damage unloading modulus of salt rock being surrounding rock for natural gas store cavern were tested，and the marbles as the contrast stone are also tested. All of the tests are realized on MTS815 Flex Test GT rock mechanics test system. The test types include the uniaxial compressive loading and unloading test，and the uniaxial compressive test with low cyclic loading. The loading standard is controlled by axial load and during each test，the stress amplitudes have 7 grades for each specimen. The loading wave for low cyclic loading test is sine wave with the frequency of 1.0 Hz，and the cyclic number of every level cyclic stress is no less than 30 cycles. The research results show that salt rock has larger irreversible deformation at the turning position between reloading and unloading，corresponding elastic deformation response is slow；but the results for the marble are contrary，the shape of stress-strain hysteresis loops is ribbon for salt rock，while it is tine lobation for marble. The changing tendency of unloading modulus for salt rock is reverse by the two test methods above，while it is consistent with each other for marble，and the unloading modulus decreases with the increasing loading stress. The effect of loading stress amplitude on the increment of irreversible deformation for salt rock is more prominent than that of cyclic numbers. The research reveals the damage evolution characteristics for salt rock under the operational loading of store carven.

Key words： rock mechanics salt rock damage variable unloading modulus viscoplastic deformation

引用本文:

刘建锋，裴建良，张茹，王璐. 基于多级荷载试验的岩石损伤模量探讨[J]. 岩石力学与工程学报, 2012, 31(S1): 3145-3151.
LIU Jianfeng，PEI Jianliang，ZHANG Ru，WANG Lu. DISCUSSION ON DAMAGE MODULUS FOR ROCK BASED ON MULTI-LEVEL LOAD TEST. , 2012, 31(S1): 3145-3151.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3145

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