王树立, 刘志河, 张开智,等.循环温度作用下石膏矿岩强度劣化效应试验研究[J].河南理工大学学报（自然科学版）,2023,42(3):153-157.

WANG S L, LIU Z H, ZHANG K Z,et al.Experimental study on strength weakening effect of gypsum mine rock under circulating temperature[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):153-157.

循环温度作用下石膏矿岩强度劣化效应试验研究

王树立1, 刘志河1, 张开智2, 郑怀昌1

1.山东理工大学 资源与环境工程学院，山东 淄博  255000;2.贵州理工学院 矿业工程学院，贵州 贵阳  550003

摘要:为研究循环温度对石膏矿岩的影响，采用波速表征石膏矿岩的完整度、单轴抗压强度表征石膏矿岩的强度劣化效应，开展循环温度作用下石膏矿岩强度劣化效应试验。结果表明：随着循环温度次数增加，石膏矿岩波速整体呈现平→急→波动→稳的变化规律，完整度最大降低率为27.3%，证明循环温度作用可造成石膏矿岩内部结构的变化和损伤；随着循环温度次数增加，石膏矿岩应力-应变曲线的压密阶段时间增长、弹性阶段时间减少、塑性阶段时间增加、峰值强度对应的应变增大，强度整体呈降低趋势，最大强度劣化率为12.60%，证明循环温度对石膏矿岩强度有劣化效应。研究成果对揭示石膏矿大面积采空区坍塌机理和防控具有一定的理论指导和借鉴意义。

关键词:石膏矿岩;循环温度;波速;单轴抗压强度;强度劣化

doi:10.16186/j.cnki.1673-9787.2021050105

基金项目:国家自然科学基金资助项目（51904177）

收稿日期:2021/05/25

修回日期:2021/08/20

出版日期:2023/05/25

Experimental study on strength weakening effect of gypsum mine rock under circulating temperature

WANG Shuli1, LIU Zhihe1, ZHANG Kaizhi2, ZHENG Huaichang1

1.School of Resources and Environmental Engineering，Shandong University of Technology，Zibo  255000，Shandong，China;2.Institute of Minging Engineering，Guizhou Institute of Technology，Guiyang  550003，Guizhou，China

Abstract:In order to study the influence of circulating temperature on gypsum rock，experiments were carried out to reveal gypsum rock strength weakening with wave velocity representing integrity and uniaxial compressive strength representing strength weakening.The results showed that：With the number of circulating temperature increasing，the wave velocity showed out the law of “gentle-sharp-fluctuate-stable”，and the integrity decrease rate of gypsum rock was 27.3%，which verified that circulating temperature induced micro-structure change and damage to gypsum rock.With the number of circulating temperature increasing，the stress-strain curve of gypsum rock showed out compaction stage growing， elastic stage shortening，plastic stage increasing and strain of peak strength increasing，the peak strength was decreasing，and the biggest decreasing rate was 12.60%，which verified that the circulating temperature induced strength weakening effect of gypsum rock.The research results had theoretical guidance and reference significance to reveal the collapse mechanism of large gypsum goaf and its control.

Key words:gypsum mine rock;circulating temperature;wave velocity;uniaxial compressive strength;strength weakening

循环温度作用下石膏矿岩强度劣化效应试验研究_王树立.pdf