Field investigation and numerical study of a siltstone slope instability induced by excavation and rainfall

Li, Q.; Wang, Y. M.; Zhang, K. B.; Yu, Heng; Tao, Zhigang

doi:10.1007/s10346-020-01396-5

Cited by 55 publications

(23 citation statements)

References 31 publications

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“…The boundary conditions of the model are as follows: the four sides restrict the displacement in the horizontal direction, the bottom restricts the displacement in the vertical direction, and restricts the rotation of the pile around its axis. (Li et al 2020). The physical and mechanical parameters of the soil and rock are obtained according to the laboratory test, as shown in Table 1.…”

Section: Model Descriptionmentioning

confidence: 99%

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

Xia

Zhong³

et al. 2022

Preprint

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The slope of an open cut tunnel is located above the exit of the Leijia tunnel on the Changgan high-speed railway. During the excavation of the open cut tunnel foundation pit, the slope slipped twice, a large landslide of 92500 m³ formed. The landslide body and unstable slope body not only caused the foundation pit of the open cut tunnel to be buried and the anchor piles to be damaged but also directly threatened the operational safety of the later high-speed railway. Therefore, to study the stability change in the slope of the open cut tunnel under heavy rain and excavation conditions, a 3D numerical calculation model of the slope is carried out by Midas GTS software, the deformation mechanism is analyzed, anti-sliding measures are proposed, and the effectiveness of the anti-sliding measures is analyzed according to the field monitoring results. The results show that when rainfall occurs, rainwater collects in the open cut tunnel area, resulting in a transient saturation zone on the slope on the right side of the open cut tunnel, which reduces the shear strength of the slope soil; the excavation at the slope toe reduces the anti-sliding capacity of the slope toe. Under the combined action of excavation and rainfall, when the soil above the top of the anchor pile is excavated, two potential sliding surfaces are bounded by the top of the excavation area, and the shear outlet is located at the top of the anchor pile. After the excavation of the open cut tunnel, the potential sliding surface is mainly concentrated at the lower part of the downhill area, and the shear outlet moves down to the bottom of the open cut tunnel. Based on the deformation characteristics and the failure mechanism of the landslides, comprehensive control measures, including interim emergency mitigation measures and long-term mitigation measures, are proposed. The field monitoring results further verify the accuracy of the anti-sliding mechanism analysis and the effectiveness of anti-sliding measures.

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Section: Model Descriptionmentioning

confidence: 99%

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

Xia

Zhong³

et al. 2022

Preprint

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“…The stress field adjustment and rock-soil mass deformation triggered by excavation unloading may result in primary crack expansion and new crack generation in the slope. Meanwhile, water infiltration can promote the propagation of cracks, increase the rock-soil mass weight, and reduce the rock-soil mass shear strength [19][20][21][22]. An optimization of the scope of reclamation works with respect to the shaping of the reservoir slopes mainly involves defining the limit values of their stability and load-bearing capacity.…”

Section: Optimization Of Reclamation Work In the Aquatic Directionmentioning

confidence: 99%

Slope Shape Optimization of Water Reservoirs Formed Due to the Reclamation of Post-Mining Excavations

2022

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Reclamation of post-mining areas is one of the most important duties of an entrepreneur involved in mining mineral resources with the use of surface techniques. There are various forms of reclamation activities that depend on the chosen reclamation direction and intended function of the reclaimed object as well as from the type of the mined mineral. When there is water present in the mining excavation, we are talking about the aquatic direction of reclamation. This particular type of post-mining area requires a particular shape—especially if its intended future function is recreational. This research addresses optimization-related analyses and calculations of slope inclination in water reservoirs formed in post-mining excavations of both clastic and clay rock raw materials. Considering the conditions of stability and load-bearing capacity of water reservoir slopes, their optimum slopes were determined using the FlexPDE v 6.0 program., based on a two-dimensional elastoplastic model from the Coulomb–Mohr criterion. The inclinations of 1:5 and 1:15 are proposed, respectively, for the above-waterline and below-waterline slopes that serve a beach function. Slopes that do not serve a beach function are proposed to have an inclination of 1:2. Obviously, the strength conditions in the soil medium as well as the comfort of users were key drivers when it comes to selection of the slope inclinations.

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“…During the construction of highways and railways, slope excavation will not only change the original stress state of a slope, but also accelerate the weathering speed of new exposed rock mass [1][2][3][4]; therefore, it is necessary to support the excavated slope along the road to improve the stability of the excavated slope, so as to ensure the operation safety of the road. There are many kinds of slope support methods, commonly used slope support structures include retaining wall [5][6][7], anti-slide pile [8,9], prestressed anchor rod [10,11] and prestressed anchor cable [12,13], among them, the prestressed anchor cable has been widely used in slope support engineering due to its advantages of reliable strength, simple construction and economic benefits.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

Shi

Tian

et al. 2021

Mathematics

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Considering the interaction among anchor cable, frame beam and rock mass, a new model of prestress loss of anchor cable was established. The accuracy and applicability of the new model were verified by comparing the field monitoring data and the calculation results of existing models. In addition, based on the new model, the effect of the re-tension of the anchor cable at different time nodes was analyzed, and the later compensation time of anchor cable prestress was discussed. The research shows that: the accuracy of the new model is higher after considering the effect of the frame beam, the new model can not only calculate the loss of prestress of anchor cable, but also accurately predict the time when the prestress of anchor cable reaches the stable stage. The ideal effect of prestress compensation can be achieved when the anchor cable is re-tensioned at each time point after 20 days of the construction completed. The original prestress loss of the anchor cable is different, and the re-tension effect is also different, the greater the loss of the original prestress of the anchor cable, the more obvious the prestress compensation effect during the re-tension.

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Field investigation and numerical study of a siltstone slope instability induced by excavation and rainfall

Cited by 55 publications

References 31 publications

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

Slope Shape Optimization of Water Reservoirs Formed Due to the Reclamation of Post-Mining Excavations

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

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