盐岩单轴蠕变力学特性试验研究

丁伟伟; 黄光利

doi:10.20174/j.JUSE.2025.06.18

地下空间与工程学报 >

2025 , Vol. 21 >Issue 6: 2017 - 2025

DOI: https://doi.org/10.20174/j.JUSE.2025.06.18

理论与试验研究

盐岩单轴蠕变力学特性试验研究

丁伟伟 ,
黄光利

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中煤科工集团重庆研究院有限公司,重庆 400039

丁伟伟(1987—),男,河南临颍人,工程师,主要从事地下空间安全方向的研究。E-mail:815399995@qq.com

收稿日期: 2025-03-22

网络出版日期: 2025-12-31

基金资助

重庆市博士“直通车”项目(CSTB2023NSCQ-BSX0009);国家自然科学基金面上项目(52274092)

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Experimental Study on the Uniaxial Creep Mechanical Properties of Salt Rocks

Ding Weiwei ,
Huang Guangli

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China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, P. R. China

Received date: 2025-03-22

Online published: 2025-12-31

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摘要

盐穴储气库的长期运营过程中,储库内压变化的持续时间相对较长且内压变化频率相对较低,储库围岩变形过程是一个处于低频循环荷载作用下的蠕变变形过程。为了深入研究盐岩在长期蠕变条件下的力学特性,进行了3组盐岩单轴蠕变试验。结果表明:(1) 对于破坏的盐岩试样,其变形过程分为减速变形、稳定变形和加速变形3个阶段,对应的应力应变曲线呈现出“稀疏”—“密集”—“稀疏”的变化趋势;(2) 在加载速率和应力上限两种影响因素中,应力上限对盐岩力学特性的影响更为显著。在相同应力振幅下,随循环次数增加,不同荷载速率对盐岩变形的影响逐渐减小;(3) 在加载阶段,盐岩试样的变形速率随时间逐渐减小,直至应力增长至应力振幅60%时,应变速率开始增大;(4)在应力上限恒定阶段,应变速率随时间逐渐减小,但在试样临破坏时,应变速率显著增加;(5) 在整个试验过程中,不同循环在加载阶段和在应力上限恒定阶段,应变速率近乎相等。试样临破坏前一个循环时的应力上限恒定阶段,应变速率明显增加;(6) 卸载阶段的变形速率随荷载减小而增大,盐岩弹性应变在此阶段恢复,表现出负值的变形速率;(7)在应力下限恒定阶段,应变速率为接近于零的负值,并呈波动状态。

关键词： 储气库; 蠕变; 变形速率; 循环荷载

本文引用格式

丁伟伟 , 黄光利 . 盐岩单轴蠕变力学特性试验研究[J]. 地下空间与工程学报, 2025 , 21(6) : 2017 -2025 . DOI: 10.20174/j.JUSE.2025.06.18

Abstract

During the long-term operation of salt cavern gas storage, the duration of pressure changes within the reservoir is relatively long, and the frequency of pressure changes is relatively low. The deformation process of the reservoir's surrounding rock is a creep deformation process under low-frequency cyclic loading. To deeply study the mechanical properties of salt rock under long-term creep conditions, three sets of uniaxial creep tests on salt rock were conducted. The test results show that: (1) For damaged salt rock samples, the deformation process is divided into three stages: decelerated deformation, stable deformation, and accelerated deformation. The corresponding stress-strain curve exhibits a trend of "sparse"-"dense"-"sparse". (2) Among the two influencing factors of loading rate and stress upper limit, the stress upper limit has a more significant impact on the mechanical properties of salt rock. Under the same stress amplitude, as the number of cycles increases, the impact of different loading rates on salt rock deformation gradually decreases. (3) During the loading stage, the deformation rate of the salt rock samples gradually decreases over time until the stress increases to 60% of the stress amplitude, at which point the strain rate starts to increase. (4) In the constant stress upper limit stage, the strain rate gradually decreases over time, but significantly increases when the sample is close to failure. (5) Throughout the test process, the strain rates during different cycles are nearly equal in both the loading stage and the constant stress upper limit stage. In the final cycle before sample failure, the strain rate in the constant stress upper limit stage increases noticeably. (6) In the unloading stage, the deformation rate increases as the load decreases, with the elastic strain of the salt rock recovering in this stage, showing a negative deformation rate. (7) During the constant stress lower limit stage, the strain rate is close to 0 and fluctuates in a negative value state.

Key words： gas storage; creep; deformation rate; cyclic loading

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