Study on Deformation Characteristics of Loess Ultrahigh-Fill Slope Based on Large-Scale Undisturbed Soil Centrifugal Model Tests
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
FRONTIERS IN EARTH SCIENCE
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Key Words:
slope engineering, centrifugal model test, collapsible loess, high filling, deformation characteristics
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Abstract:
Taking the loess high-fill project of Lv Liang airport in China as the research object, largescale 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 postconstruction 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.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
2296-6463
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Translation or Not:
no
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Date of Publication:
2022-03-08
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