Model Test of Deformation Evolution and Multi Factor Prediction of Anchorage Slope Stability under Rainfall Condition

Wu, Tingyao; Jia, Jianhong; Jiang, Nan; Zhou, Chuanbo; Luo, Xuedong; Xia, Yuqing

doi:10.1007/s12583-020-1343-5

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…When describing phenomena occurring in nature or in engineering practice, we often have to study them by means of establishing state variables, so state variables can be considered as a kind of covariate that requires an allround description of the systematic state of the phenomenon at hand [23].…”

Section: Status Variablesmentioning

confidence: 99%

Mechanical Analysis of Road Graben Slopes Based on Saturated-Unsaturated Seepage Theory

Peijun,

Hao,

Qing

2023

TECM

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As the construction of mountainous highways continues to heat up, the stability analysis of road graben slopes becomes one of the current research hotspots. In this paper, based on the saturated-unsaturated seepage theory, the force analysis of the road graben slope under rainfall conditions and its laws are studied. Firstly, the damage mode of the road graben slope and its three damage stages of creeping deformation, sliding damage and tendency to stability are summarized according to the engineering practice and literature survey, and the right side of the road graben slope from K316+439 to K316+859 of Longlian Expressway is monitored, so as to amend the next theoretical analysis. The three stages of rainfall infiltration were analyzed, the state variables and material variables of soil water were selected according to the continuous medium theory and the soil water suction analysis was carried out. Based on the saturated-unsaturated seepage theory, the fluid-structure interaction mathematical model and soil moisture characteristic curve (SWCC) model under rainfall infiltration conditions were established, and the stress of the cutting slope under saturation conditions was analyzed. The experimental results show that for the soil at the foot of the slope, the infiltration depth of rainfall is limited due to the low permeability coefficient, and the change of seepage field is not obvious; the longer the rainfall is held, the deeper the infiltration depth is, and the rainfall will continuously replenish the groundwater, so the force on the slope of the road graben will increase continuously and finally reach the limit of damage. When the rainfall intensity is 5mm-h-1, the decline of stability coefficient for 48 h is 0.121; the initial stability coefficient of the slope is the largest when the dip angle of the weak interlayer is equal to 25∘, and the stability coefficient decreases rapidly with the rainfall time, and when the rainfall reaches 60 h, the stability coefficient tends to be stable and the equilibrium of the slope force no longer changes.

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Section: Status Variablesmentioning

confidence: 99%

Mechanical Analysis of Road Graben Slopes Based on Saturated-Unsaturated Seepage Theory

Peijun,

Hao,

Qing

2023

TECM

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“…Recently, many scholars have made some achievements in the study of similar materials in model tests. Wu et al [7] used mixture of gypsum, cement, water and other materials to simulate sandstone, and the similar sandstone was verified by the indoor model test of anchorage slope; Wu [8] studied the mechanical response characteristics of shield tunnel under train vibration by indoor similarity test. The similar materials of soil were simulated by mixing river sand, quartz sand, fly ash and oil and good results were obtained.…”

Section: Introductionmentioning

confidence: 99%

Determination and Application of Similar Materials in a Subway Excavation and Support Model Test

Jian

Wang

2023

J. Phys.: Conf. Ser.

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In order to study the mechanical response of strata during the construction of a subway, it is crucial to develop similar materials suitable for indoor model tests. Therefore, based on the similarity theory, combined with the uniaxial compressive test results of similar materials, the similar materials and their ratios of advanced small pipes, shotcrete and steel frames were determined. Then, they were applied to the model test of a subway excavation and support. The variation laws of surface displacement, stress distribution around the tunnel and internal force of the steel frame during tunnel excavation and support were obtained to verify the reliability of similar materials. The results show that the aluminum arch frame with width of 4.87 mm and thickness of 5.00 mm can be used to simulate the grid steel frame. Nine fine steel wires in a ring are taken to simulate the advanced small pipes, and gypsum with elastic modulus of about 1.12 GPa are prepared to simulate the initial shotcrete. They are proven to accurately simulate the physical characteristics of supporting materials in practical engineering, and the variation is similar to that obtained from the field test, which improves the authenticity of the model test results.

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“…Many studies analyze the influence of rainfall on slope stability, and two main methods are utilized: (1) field investigations and monitoring data analysis through model tests [20][21][22][23] and (2) numerical simulations, such as the finite element method and finite difference method [24][25][26][27][28]. Numerical simulation has advantages in obtaining some key physical quantities, which are difficult to measure in the model tests and field investigations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rainfall Pattern and Crack on the Stability of a Red Bed Slope: A Case Study in Yunnan Province

Zhu

Sheng

et al. 2021

Advances in Civil Engineering

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Red bed slopes in the southwest of China are associated with a grant number of geological hazards, such as landslides, mud-rock flows, and rock blocks falling, which are vital problems in geotechnical engineering. The damage can be induced or triggered due to a series of human and environmental activities, such as excavation, concentrated or long-term rainfall, earthquake, and fluctuation of groundwater level. According to the field observations and geological exploration results, a small-scale landslide was observed on January 10, 2016, after excavation along XiaoMo highway in Yunnan Province. A numerical model in actual size using GeoStudio software based on this typical red bed engineering slope was established in this study. Back analyses and laboratory tests were used to obtain the mechanical parameters of the geomaterial inside the slope. The historic rainfall data of Mengla County from July to September in 2016 was utilized as the flux boundary in analyzing the seepage variation features and the stability of the engineering slope in the rainy season. One major tension crack was set in the shallow region of the silty clay according to the geology survey to perform the disturbance of excavation on the geomorphology of the slope. Attempts were made to establish the anisotropic permeability of the crack induced by the complex fillings, and differences in the hydraulic response between the cracking and completed slope during the rainfall process were discussed. The result shows that the factor of safety of the slope without crack before the rainfall is 1.076, and the slope is considered in the state of the critical limit equilibrium, which is in accordance with the previous state of the slope under real conditions. The pore water pressure variations of the monitor points in the shallow region of the completed slope present close compliance with the rainfall intensity subjected to different rainfall patterns, which also controls the distribution of the plastic zone in the slope after rainfall. The comparisons in the seepage field and plastic zone between the cracking and completed slope reveal that the crack can shorten the infiltration path effectively, and the higher the permeability coefficient in the vertical direction is, the larger the pore water pressure increasing zone is and the higher the underground water level is, which should be paid more attention in highway constructions.

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Model Test of Deformation Evolution and Multi Factor Prediction of Anchorage Slope Stability under Rainfall Condition

Cited by 10 publications

References 33 publications

Mechanical Analysis of Road Graben Slopes Based on Saturated-Unsaturated Seepage Theory

Mechanical Analysis of Road Graben Slopes Based on Saturated-Unsaturated Seepage Theory

Determination and Application of Similar Materials in a Subway Excavation and Support Model Test

Effect of Rainfall Pattern and Crack on the Stability of a Red Bed Slope: A Case Study in Yunnan Province

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