School of Mining, Guizhou University

为揭示红页岩破坏的力学特性和能量演化规律,通过电液伺服机对红页岩进行三轴压缩试验,研究不同干湿循环作用下红页岩试样峰值强度特征、力学特性和能量演化规律。结果表明:干湿循环次数对红页岩的抗压强度有显著的影响,并呈负相关关系;干湿循环作用会使岩样破坏阶段的脆性减弱,延性增强,降低其物理力学特性;对比干湿循环作用前后试样的变形特征曲线图,红页岩原试样的变形量大于干湿循环作用后的试样变形量,约为后者的1.7倍;红页岩破坏后,原试样的耗散能增长速率为干湿循环作用后试样的2.4倍,因为干湿循环作用会软化红页岩岩石内部结构,使其破坏时体积应变变化缓慢,从而导致耗散能相比于原试样增长较慢。

In order to reveal the mechanical properties and energy evolution law of red shale failure,triaxial compression tests were carried out on red shale by electro-hydraulic servo machine to study the peak strength characteristics,mechanical properties and energy evolution law of red shale samples under different wetting-drying cycles. The results show that the number of wetting-drying cycles has a significant influence on the compressive strength of red shale and is negatively correlated; the wetting-drying cycle will weaken the brittleness and increase the ductility of the rock sample in the failure stage,and reduce its physical and mechanical properties; compared with the deformation characteristic curves of the samples before and after wetting-drying cycle,the deformation of the original sample of red shale is about 1. 7 times that of the sample after the wetting-drying cycle; after the destruction of the red shale,the growth rate of the dissipated energy of the original sample is 2. 4 times that of the sample after the action of wetting-drying cycle,because the action of wetting-drying cycle will soften the internal structure of the red shale rock,making the volume strain change slowly during the destruction,resulting in the slower growth of the dissipated energy compared with the original sample.

国家自然科学基金项目(52164003);贵州省科技计划项目(黔科合人才平台[2021]5610);贵州省科技支撑计划项目(黔科合支撑[2021]一般352);贵州省教育厅科技拔尖人才项目(黔教技[2022]072号)

冯小磊,马振乾,陈安民. 干湿循环作用下红页岩力学特性与能量特征研究[J]. 矿业安全与环保,2023,50(4):47-54.

FENG Xiaolei,MA Zhenqian,CHEN Anmin. Study on mechanical and energy characteristics of red shale under wetting-drying cycle[J]. Mining Safety & Environmental Protection,2023,50(4):47-54.