Regarding the influence of cyclic loading and dry-wet cycling coupling effects on the evolution of mechanical properties of dolomite, triaxial compression tests are conducted under different dry-wet cycle counts and cyclic loading upper limits. Combined with macro- and microstructural analysis, the strength degradation, deformation characteristics, and damage evolution mechanisms of dolomite are systematically investigated. The results indicate that: As the number of dry-wet cycles increases, the mass of dolomite decreases, while the water content shows a logarithmic increasing trend. With the increase in dry-wet cycles, the peak compressive strength and elastic modulus of dolomite gradually decrease, and the damage factor exhibits a logarithmic increase. Different upper-limit cyclic loadings have a certain promoting effect on the dry-wet degradation. The elastic modulus of the specimens shows varying trends with the increase in the upper limit of cyclic loading. Dry-wet cycling has no significant impact on the failure mode of dolomite, which remains shear failure or mixed shear-tensile failure. Dry-wet cycling leads to the dissolution of internal soluble salts and colloids in dolomite, as well as the initiation and propagation of cracks, while cyclic loading and unloading at different upper limits accelerate crack propagation and the destruction of cementing materials between particles. When these two factors act together, the deterioration rate of the rock's physical properties is faster than under either factor alone.
[1] 蒋建国, 郭建强, 陈建行,等. 干湿循环作用下泥质白云岩能量机制试验研究[J]. 地下空间与工程学报, 2022, 18(2): 522-531. (Jiang Jianguo, Guo Jianqiang, Chen Jianhang,et al. Experimental study on energy mechanism of argillaceous dolomite under cyclic wetting and drying[J]. Chinese Journal of Underground Space and Engineering, 2022, 18(2): 522-531. (in Chinese))
[2] 张亮,王桂林,张益晨,等.干湿循环下节理砂岩细观能量演化规律研究[J].地下空间与工程学报,2024,20(1):42-54,63. (Zhang Liang,Wang Guilin,Zhang Yichen,et al.Study on meso-energy evolution law of jointed sandstone under dry-wet cycle[J].Chinese Journal of Underground Space and Engineering,2024,20(1):42-54,63. (in Chinese))
[3] Wu X, Gong M, Wu H,et al. Parameter calculation of the initiating circuit with mixed use of nonel detonators and electronic detonators in tunnel controlled-blasting[J]. Tunnelling and Underground Space Technology, 2021, 113: 103975.
[4] 王智. 干湿循环作用下砂岩三轴压缩力学特性试验研究[J]. 山西建筑, 2023, 49(3): 87-90. (Wang Zhi. Experimental study on triaxial compressive mechanical properties of sandstone under dry and wet cycling[J]. Shanxi Architecture, 2023, 49(3): 87-90. (in Chinese))
[5] 孙怡, 邓荣贵, 文琪鑫,等. 红层泥质岩循环干湿风化下变形特性试验研究[J]. 铁道科学与工程学报, 2020, 17(1): 57-65. (Sun Yi, Dang Ronggui, Wen Qixin,et al. Experimental study on deformation characteristics ofred-bed mudstone under cyclic dry-wet weathering[J]. Journal of Railway Science and Engineering, 2020, 17(1): 57-65. (in Chinese))
[6] 樊德东, 仇意, 常乐. 三轴压缩与干湿循环作用下灰岩的力学试验研究[J]. 湖南文理学院学报(自然科学版), 2021, 33(3): 69-75. (Fan Dedong, Qiu Yi, Chang Le. Uniaxial test study on reinforcement of saturated red sandstone with threedifferent types of holes[J]. Journal of Hunan University of Arts and Science(Science and Technology, 2021, 33(3): 69-75. (in Chinese))
[7] Wu G, Chen W, Cui K. The numerical simulation of the drying-wetting cycles' influence on the deterioration characteristics of gypsum rocks under particle flow code[J]. Earth Sciences Research Journal, 2020, 24(1): 55-59.
[8] 韩犇, 刘平. 循环荷载作用下岩石疲劳变形及特性试验研究[J]. 土工基础, 2013, 27(6): 131-133. (Han Ben, Liu Ping. Experimental study on fatigue deformation and characterization of rocks under cyclic loading[J]. Soil Engineering and Foundation, 2013, 27(6): 131-133. (in Chinese))
[9] 王者超, 赵建纲, 李术才,等. 循环荷载作用下花岗岩疲劳力学性质及其本构模型[J]. 岩石力学与工程学报, 2012, 31(9): 1888-1900. (Wang Zhichao, Zhao Jiangang, Li Jucai, et al. Fatigue mechanical behavior of granite subjected to cyclic loading and its constitutive model[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(9): 1888-1900. (in Chinese))
[10] 赵宝云, 刘东燕, 黄伟,等. 压-拉循环荷载作用下红砂岩蠕变特性[J]. 中南大学学报(自然科学版), 2018, 49(8): 2058-2066. (Zhao Baoyun, Liu Dongyan, Huang Wei, et al. Creep behavior of red sandstone underuniaxial cyclic compression and tension loading[J]. Journal of Central South University (Science and Technology), 2018, 49(8): 2058-2066. (in Chinese))
[11] 郑孝军, 胡志军, 刘倡清,等. 裂隙岩石疲劳损伤变形规律CT试验初探[J]. 西安科技大学学报, 2005(4): 469-472. (Zheng Xiaojun, Hu Zhijun, Liu Xiangqing, et al. Deformation characteristic of crack rock fatigure failure by using CT testing[J]. Journal of Xi'an University of Science and Technology, 2005(4): 469-472. (in Chinese))
[12] 张志镇, 高峰. 单轴压缩下红砂岩能量演化试验研究[J]. 岩石力学与工程学报, 2012, 31(5): 953-962. (Zhang Zhizhen, Gao Feng. Experimental research on energy evolution of redsandstone samples under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(5): 953-962. (in Chinese))
[13] 张志镇, 高峰. 受载岩石能量演化的围压效应研究[J]. 岩石力学与工程学报, 2015, 34(1): 1-11. (Zhang Zhizhen, Gao Feng. Confining pressure effect on rock energy[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(1): 1-11. (in Chinese))
[14] Wang H, He M, Zhu J,et al. Experimental investigation of linear damping characteristics on granite and red sandstone under dynamic cyclic loading[J]. 2022, 26(11): 5259-5278.
[15] 徐鹏, 周剑波, 黄俊,等. 循环加卸载下大理岩损伤与能量演化特征[J]. 长江科学院院报, 2020, 37(3): 90-95,107. (Xu Peng, Zhou Jianbo, Huang Jun,et al. Damage Evolution and strain energy characteristic of marble under triaxial cyclic compression[J]. Journal of Yangtze River Scientific Research Institute, 2020, 37(3): 90-95,107. (in Chinese))
[16] Zhao H, Song Z, Zhang D,et al. True triaxial experimental study on mechanical characteristics and energy evolution of sandstone under various loading and unloading rates[J]. 2021, 7: 1-17.
[17] 胡星宇, 高乾丰, 曾铃,等. 湿热循环作用下中风化花岗岩强度损伤特性研究[J]. 地下空间与工程学报, 2023, 19(6): 1800-1808. (Hu Xingyu, Gao Qianfeng, Zeng Ling, et al. Study of strength damage characteristics of moderately weathered granite under wetting-heating cycles[J]. Chinese Journal of Underground Space and Engineering, 2023, 19(6): 1800-1808. (in Chinese))
