Abstract
Taking the loess high-fill project of Lv Liang airport in China as the research object, large-scale centrifugal tests were carried out to investigate the deformation characteristics of the collapsible loess ultrahigh-fill slope under natural moisture content and saturated state by using a joint model of undisturbed loess and remolded loess. The results show that the consolidation deformation of the collapsible loess ultrahigh-fill slope is the main factor causing its deformation. The post-construction deformation amount and deformation rate are large in the early stage, and the relationship between the post-construction deformation and thickness of filling body is linear. When the water content of soil increases due to infiltration, the consolidation of the filling body and the collapse of the undisturbed foundation loess will cause settlement and deformation of the slope. The slope may crack along the soft zone formed when the water infiltrates. When failure occurs, the sliding surface will pass through the collapsible soil layer. The contact surface between the collapsible loess layer and the adjacent soil layer is part of the sliding surface, and the contact surface with a relatively low strength will be damaged first. When the strength difference between adjacent soil layers is large, the upper soil layer on the slip surface shows a typical translational sliding mode. The slip surface is approximately arc-shaped, and there is a transition layer with a specific thickness between the slip surface and contact surface. The water content of the high-fill slope has a great influence on the post-construction settlement of the slope crest and slope stability. The post-construction settlement of the slope crest increases with the increase in the water content of the filling body, and the stability coefficient of the slope decreases with the increase in the water content of the filling body. In the saturated state, the sliding force of soil increases, the shear strength decreases, and the stability of high fill slope decreases. Therefore, it is necessary to strengthen the inspection of the rationality of drainage system design in slope construction to ensure slope safety.
Highlights
To solve the contradiction between land supply and infrastructure construction, scientific researchers have increased the research on bad rock and soil mass (Fan et al, 2019; Liu et al, 2020a; Wang et al, 2021a; Wang et al, 2021b; Wang et al, 2022a). a large number of high-fill slopes have emerged in large-scale projects in collapsible loess regions of the world, typified by Western China
Luo et al studied the law of sand slope stability with slope gradient and water content based on the geotechnical centrifugal model test technology, analyzed the deformation characteristics and failure mode of sand slope under a centrifugal load, and discussed the comparison mechanism of the influence of water migration phenomenon of sand with a higher water content on slope stability (Luo et al, 2018)
To maximize the restoration of stress and consolidation of the undisturbed soil, reduce the experimental errors caused by the weak joints, and prevent the soil samples from being broken due to uneven contact surfaces during loading, after the original undisturbed soil layer in the model was completed, a plastic film was used to cover the upper surface, and the plastic film was covered with loose Q3 Malan loess, and the compaction degree was controlled to approximately 85%
Summary
To solve the contradiction between land supply and infrastructure construction, scientific researchers have increased the research on bad rock and soil mass (Fan et al, 2019; Liu et al, 2020a; Wang et al, 2021a; Wang et al, 2021b; Wang et al, 2022a). a large number of high-fill slopes have emerged in large-scale projects in collapsible loess regions of the world, typified by Western China. The use of centrifugal model tests to study the slope deformation characteristics under different conditions has gradually emerged, and some important results have been obtained. Based on the high-fill engineering of the Yan’an loess gully, Wu et al studied the deformation characteristics and stability of the high-fill slope with the change in water level through centrifugal model tests and finite element stress analysis (Wu et al, 2017). Peng et al analyzed and compared the deformation characteristics and failure mechanism of homogeneous loess slopes and a double paleosol-interlayer loess slope under different excavation slope angles based on centrifugal model tests. The research results can provide a reliable basis for the design and construction of similar projects
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