To explore the evolution law of mechanical properties of disintegrating mudstone under dry-wet cycles, the disintegrating mudstone in the northern part of Guangxi was taken as the research object. Uniaxial compression tests and scanning electron microscopy tests at the same position were carried out under different dry-wet cycle numbers. The deterioration law of physical and mechanical parameters, energy evolution law and microstructure change characteristics of mudstone under different dry-wet cycle numbers were analyzed, and a statistical damage constitutive model considering the residual strength of mudstone was established. The results show these as follows. After 5 cycles, the mass loss rate of mudstone reaches 12.9%, the longitudinal wave velocity, uniaxial compressive strength and elastic modulus decrease by 77.9%, 82.1% and 76.2% respectively, and the failure mode changes from shear failure to ductile failure with multiple shear bands. Microstructure analysis shows that the cementation material softens and fractures due to the water-hydration-drying cycle, and the development of micro-pores and particle shedding in mudstone are positively correlated with the number of dry-wet cycles. Based on the energy dissipation evolution law, a four-stage damage development model is proposed, revealing that the elastic strain energy storage capacity of mudstone decreases exponentially with the number of dry-wet cycles. Based on the Weibull distribution and the maximum tensile strain criterion, a damage statistical model considering the residual strength correction is constructed, achieving high-precision characterization of the post-peak residual strength stage (R2>0.9). The research results provide a theoretical basis for the long-term stability study of disintegrating mudstone slopes in the northern part of Guangxi.
HE Xiao-yun, LIU Xian-feng, HOU Zhao-xu, LI Jian-guo, YUAN Sheng-yang, HE Neng-fang.
Evolution of Mechanical Properties and Damage Constitutive Model of Disintegrated Mudstone under Dry-wet Cycles[J].
Science Technology and Engineering, 2026, 26(11): 4833-4843 DOI:10.12404/j.issn.1671-1815.2502840
根据试验结果,可对岩石受荷过程中的能量演化规律进行分析,进而揭示干湿循环作用对岩石强度的劣化特性。张亮等[12]基于室内三轴压缩试验结果阐明了干湿循环作用下节理砂岩变形破坏的能量驱动机制;刘新喜等[13]通过三轴压缩试验发现起裂应力处储能水平和损伤应力处储能水平随着干湿循环次数的增加逐渐增大;Huang等[14]基于岩石单轴抗压强度试验结果建立了基于能量原理的干湿循环损伤演化模型;Wen等[15]基于三轴试验结果,发现总吸收能与围压呈正相关,粉砂岩吸收能量的能力与干湿循环次数呈负相关;Zha等[16]通过分析单轴抗压强度试验结果,发现红层泥质粉砂岩能量密度随着干湿循环次数线性下降。同时,也有学者根据试验结果,构建了相应的损伤本构模型。Qin等[17]基于黄砂岩干湿循环作用下的CT(computed tomography)和SEM(scanning electron microscope)结果,提出了一种基于细观损伤的干湿循环本构模型;成辉等[18]通过粉砂质泥岩不同干湿循环路径的三轴压缩试验,基于连续损伤理论和修正Drucker-Prager(D-P)强度准则建立了考虑干湿循环路径的岩石损伤本构模型。邓华锋等[19]将不同干湿循环次数下泥岩单轴压缩的应力-应变曲线分为两段,基于D-P准则提出了分段式损伤本构模型。
岩石试样取自广西壮族自治区平昭高速公路K12+460路堑工点,对岩石进行薄片鉴定和XRD(X-ray diffraction analysis)试验,确定该岩石岩性为含粉砂质泥岩,XRD试验结果如图1所示。该泥岩基本物理特性如表1所示。将岩石制成满足国际岩石力学学会ISRM(International Society for Rock Mechanics and Rock Engineering)标准[20]的直径为50 mm、高为100 mm的标准圆柱体试样。为使所有试样初始状态一致,筛除表面明显缺陷的试样后,将制得试样置于湿度、温度相同的室内环境中14 d。对试样进行质量、纵波波速测量,选取质量、纵波波速相近的试样进行试验。
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