To address the severe threats posed by extreme rainstorms and rising temperatures to the stability of highway cut slopes, this study establishes a dynamic evaluation model based on temperature and moisture content by integrating laboratory direct shear tests, variable-temperature permeability tests, and matric suction tests with the Green-Ampt (GA) and Van Genuchten (VG) models. The model simulates the dynamic evolution of wetting front depth and slope safety margins under dual-factor disturbances. The results indicate that soil cohesion follows a parabolic relationship with moisture content, peaking between 15% and 17%. As temperature increases, the permeability coefficient rises while the soil-water characteristic curve (SWCC) shifts downward and to the right, reflecting a significant reduction in soil water-holding capacity. Furthermore, the synergistic effect of high temperature and high moisture content markedly accelerates the advancement rate of the wetting front, leading to a substantial decrease in the slope's safety margin. These conclusions provide critical theoretical support for the early warning and disaster prevention of slopes in extreme climate regions.
HuangXiaohu, HuYulong, GuoFei,et al.Study on the mechanism of landslide promotion of expansive soil under the combined action of rainfall and reservoir water[J].Advanced Engineering Sciences,2026, 58(2):109-122.
[6]
LocheM, ScaringiG.Assessing the influence of temperature on slope stability in a temperate climate: a nationwide spatial probability analysis in Italy[J].Environmental Modelling & Software,2025,183:106217.
Van GenuchtenM T.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44:892-898.
[9]
GreenW H, AmptG A.Studies on soil physics:part I—the flow of air and water through soils[J].Journal of Agricultural Science,1911,4:1-24.
[10]
GB/T 50123—2019 土工试验方法标准 [S].
[11]
HubbertM K.Darcy's law and the field equations of the flow of underground fluids[J].Hydrological Sciences Journal,1956,207(1): 222-239.
ShaoYuxian, ShiBin, LiuChun,et al.Temperature effect on hydro-physical properties of clayey soils[J].Chinese Journal of Geotechnical Engineering,2011,33(10):1576-1582.
WangFugang, YangGuohua, ChengHui,et al.Influence of thermal deformation on hydraulic conductivity of saturated clayey soil[J]. Journal of Jilin University (Earth Science Edition),2023,53(6): 1835-1844.
[16]
WangS, GaineyL, MackinnonI D R,et al.Thermal behaviors of clay minerals as key components and additives for fired brick properties: a review[J].Journal of Building Engineering,2023,66:105802.
[17]
MaJ, ZhangY L, LvJ K,et al.Experimental study on permeability characteristics of mudstone under high temperature overburden condition[J].Processes,2023,11(10): 2828.
BiJun, ChenWenwu.Influence of forms of parameter m and largest matric suction point on the parameters of Van Genuchten model[J]. Rock and Soil Mechanics,2017,38(12):3604-3612.
[20]
GuoH T, ZhouR J, SunC,et al.Experimental study on soil-water characteristics and strength characteristics of complete-intense weathering mudstone in seasonal frozen area[J].PLoS One,2023,18(5): e0285484.
ChenShasha, ChenHan, HuangHaijian,et al.The influence of dry density on the soil water characteristics and strength characteristics of unsaturated clay soil[J].Journal of Liaoning Technical University (Natural Science),2025,44(4):447-454.
[23]
AlnmrA, AlzawiM O, RayR,et al.Experimental investigation of the soil-water characteristic curves (SWCC) of expansive soil: effects of sand content,initial saturation,and initial dry unit weight[J].Water, 2024,16(5):627.
[24]
RichardsL A.Capillary conduction of liquids through porous mediums[J]. Journal of Applied Physics,1931,1: 318-333.
[25]
BouwerH.Infiltration of water into nonuniform soil[J].Journal of the Irrigation and Drainage Division,1969,95(4):451-462.