Investigation into dynamic failure characteristics and mechanism of sandstones under effects of high temperature treatments

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-10-11 DOI:10.1007/s10064-025-04491-w

Saisai Wu, Pengbo Cui, Yanguang Yang, Jianhang Chen, Qinghua Gu, Jinnping Guo, Yao Yao

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Abstract

The geological conditions in deep underground conditions are in state of high temperature, high geo-stress and high-water pressure which brings serious challenges to safety of exploitation and utilization of underground resources. The high temperature of deep rock strata leads to a certain degree of internal damage, which causes nonlinear deformation or zoning failure characteristics. Therefore, understanding the dynamic mechanical properties and failure characteristics of rocks under high temperature conditions is quite important for the safety of deep resource exploitations. In this study, the dynamic mechanical parameters of sandstone after high-temperature treatment were obtained through Split Hopkinson Pressure Bar loading methods with temperature as variables. The dynamic damage law and damage degree of sandstone under different impact loads were analyzed. The fracture morphologies of specimens under different impact loads and temperatures were observed by scanning electron microscope. The micro characteristics, failure evolutions as well as dynamic damage mechanisms were analysed and discussed. It was concluded thermal stress leaded to uncoordinated thermal expansion of various mineral particles and induce initiation of microcracks between particles, resulted in decrease of dynamic mechanical properties of specimens. The 600 ℃ was suggested to be the inflection point, at which both the mechanical properties and fractographic features change significantly. The study and obtained results provided theoretical basis for deep mineral exploitation, especially in areas with high temperatures.

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高温作用下砂岩动态破坏特征及机理研究

地下深部地质条件处于高温、高地应力、高水压状态，对地下资源的开采利用安全带来了严峻的挑战。深部岩层的高温导致了一定程度的内部损伤，造成了非线性变形或分带破坏特征。因此，了解岩石在高温条件下的动态力学特性和破坏特征，对深部资源的安全开采具有重要意义。本研究以温度为变量，采用劈裂霍普金森压杆加载法，获得了砂岩高温处理后的动态力学参数。分析了不同冲击载荷作用下砂岩的动态损伤规律和损伤程度。用扫描电镜观察了试样在不同冲击载荷和温度下的断裂形貌。分析和讨论了细观特征、破坏演化及动态损伤机制。热应力导致各种矿物颗粒的不协调热膨胀，诱发颗粒间微裂纹的形成，导致试样的动态力学性能下降。600℃为拐点，力学性能和断口形貌均发生显著变化。研究结果为深部特别是高温地区深部矿产开采提供了理论依据。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.