School of Architecture and Engineering, Xi’an Technological University, Xi’an 710021, China
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文章历史+
Received
Published
Revised
2025-07-25
2026-09-08
2026-01-22
Online Date
2026-09-18
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摘要
为揭示地下水浸泡作用下板岩的力学性能劣化规律与微观机理,通过常规三轴压缩试验与扫描电子显微镜(scanning electron microscope,SEM)试验,系统分析了不同浸水时间下板岩的宏观力学特性与微观结构演化特征。结果表明:随浸水时间增长,板岩破坏模式由剪切破坏转为张拉破坏,峰值应力与黏聚力呈“快速-减缓-稳定”三阶段衰减,内摩擦角先增后降,围压对强度维持具有边际递减效应;SEM测试结果表明,微观结构从致密胶结(0 d)逐步发展为胶结松动(30 d)、裂隙钝化与填充(60 d),最终形成贯通裂隙网络(90 d);宏观力学劣化与微观结构演变显著相关,胶结溶解和裂隙扩展导致强度三阶段衰减,黏土矿物膨胀引发内摩擦角非线性变化,裂隙网络发育直接促使破坏模式转变。研究成果为地下水环境下板岩工程的长期稳定性评估提供了理论依据。
Abstract
In order to reveal the deterioration law of mechanical properties and the microscopic mechanism of slate under groundwater immersion, the macroscopic mechanical properties and microstructure evolution characteristics of slate under different immersion times were systematically analyzed by conventional triaxial compression tests and scanning electron microscope (SEM) tests. The results show that with the increase of immersion time, the failure mode of slate changes from shear failure to tensile failure, the peak stress and cohesion decrease in three stages of “fast-slow-stable”, the internal friction angle increases first and then decreases, and the confining pressure has a marginal decreasing effect on the strength maintenance. SEM test results show that the microstructure gradually develops from dense cementation (0 day) to loose cementation (30 days), fracture passivation and filling (60 days), and finally forms a penetrating fracture network (90 days). Macroscopic mechanical degradation is significantly related to the evolution of microstructure: cementation dissolution and crack propagation lead to a three-stage attenuation of strength, clay mineral expansion leads to a nonlinear change in the internal friction angle, and the development of a fracture network directly promotes the transformation of the failure mode. The research results provide a theoretical basis for the long-term stability evaluation of slate engineering under groundwater environment.
DENG Xiang-hui, WANG Bo-tong, WANG Rui, LIU Chong.
Mechanical Properties Test and Deterioration Mechanism of Slate under Water Immersion[J].
Science Technology and Engineering, 2026, 26(25): 10993-11001 DOI:10.12404/j.issn.1671-1815.2505509
WangHai, DongShuning, SunYajun, et al. Study on lateral curtain water interception technology and water resource protection effect in large-scale hydropower mines in China[J]. Coal Science and Technology, 2023, 51(7): 207-223.
ChenGuangbo, LiTan, YangLei, et al. Mechanical properties and damage characteristics of coal rock assemblages under water-rock interaction[J]. Journal of Coal Science and Technology, 2023, 51(4): 37-46.
LiuShiqi, ZhangCun, ZengYifan, et al. Water infiltration weakening mechanism and instability characteristics of coal pillar movement in water storage mined-out sections[J]. Journal of Mining and Safety Engineering, 2022, 39(6): 1084-1094.
RenSong, LiZhenyuan, DengGaoling, et al. Softening characteristics of gypsum rock under multiple factors[J]. Rock and Soil Mechanics, 2018, 39(3): 789-796.
ZhaoJianjun, XieMingli, LiTao, et al. Analysis of softening effect test of phyllite under saturated water conditions[J]. Journal of Engineering Geology, 2017, 25(6): 1449-1454.
CaiGuojun, ChengYuhang, ZhongChuang, et al. Analysis of softening effect test under saturated state of phyllite[J]. Science Technology and Engineering, 2021, 21(8): 3032-3038.
ShuaiPan, ZhaoWeihua, ZhouYijie. Study on the water-saturated softening effect of a tilted and deformed rock mass in phyllite[J]. Groundwater, 2023, 45(2): 8-12.
DuZehui, ZhuSheng, MaRongzeng, et al. Mechanical anisotropy and water softening characteristics of layered rock: an example of a phyllite tunnel site in Yunnan[J]. Science Technology and Engineering, 2025, 25(32): 13936-13943.
LiAnyun, KangXin, LiSen, et al. Failure characteristics and optimization measures of weakly consolidated sandstone with rich water[J]. Science Technology and Engineering, 2024, 24(13): 5336-5343.
[19]
BianK, LiuJ, ZhangW, et al. Mechanical behavior and damage constitutive model of rock subjected to water-weakening effect and uniaxial loading[J]. Rock Mechanics and Rock Engineering, 2019, 52: 97-106.
[20]
LiangX, TangS B, TangC N, et al. The influence of water on the shear behaviors of intact sandstone[J]. Bulletin of Engineering Geology and the Environment, 2021, 80(8): 1-15.
[21]
MonaA, AbeerH. Effect of soaking time on the geotechnical behavior for different types of sedimentary rocks in Egypt[J]. HBRC Journal, 2022, 18(1): 183-199.
LiErqiang, FengJili, ZhangLongfei, et al. Study on splitting tests of layered carbonaceous slate under water-rock and weathering processes[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(2): 329-337.
HuHuihua, LiJunwei, FanWentao, et al. Study on damage and deterioration characteristics of red bed soft rock under water erosion and constitutive model[J]. Rock and Soil Mechanics, 2025, 46(3): 685-694.
LuoDeng, ZhaoBing, FengYufei, et al. Evolution characteristics of shale microstructure and mechanical properties under water softening[J]. Metal Mines, 2024(8): 29-34.
HuangZhigang, ZuoQingjun, WuLi, et al. Study on nonlinear softening mechanism of clayey slate under water rockfall[J]. Rock and Soil Mechanics, 2020, 41(9): 2931-2942.
ZhengXiaoqing, LiuJian, BianKang, et al. Study on micro-mechanical characteristics and hydraulic softening of shale water saturation in northwest Hubei Province[J]. Rock and Soil Mechanics, 2017, 38(7): 2022-2028.
GaoTao, ChenYunjuan, JingYi, et al. Macro and microscopic cross-scale rupture and strength reduction damage of rock masses with different water content faults[J]. Science Technology and Engineering, 2024, 24(9): 3773-3780.
FengQianjin, CaoYonggang, HuBaowen, et al. Study on the influence of water content and schistosity dip angle on the macroscopic mechanical properties and mesoscopic characteristics of gneiss[J]. Hydropower Energy Science, 2025, 43 (8): 64-68.
[36]
LiuH L, ZhangS X, DengW X, et al. Integrated physical microstructure and mechanical performance analysis of the failure mechanism of weakly cemented sandstone under long-term water immersion[J]. Applied Sciences, 2025, 15(9): 4777.