Author
Weizheng Liu
Bio: Weizheng Liu is an academic researcher from Central South University. The author has contributed to research in topics: Suction. The author has an hindex of 1, co-authored 1 publications receiving 46 citations.
Topics: Suction
Papers
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TL;DR: In this article, the resilient modulus has been used to characterise the stress-strain nonlinear behaviour of subgrade soils and is an important parameter for pavement design and analysis, which aims at devel...
Abstract: The resilient modulus has been used to characterise the stress-strain non-linear behaviour of subgrade soils and is an important parameter for pavement design and analysis. This study aims at devel...
57 citations
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TL;DR: Wang et al. as mentioned in this paper analyzed the physical and chemical properties of construction and demolition wastes (CDW) subgrade construction case in Beijing, and a series of tests (compaction degree test, settlement observation, Portable Falling Weight Deflectometer test) were carried out.
123 citations
TL;DR: In this paper, a finite element model was developed to simulate the flexible pavement structure by considering the nonlinear characteristics of subgrade soils which are related to humidity and stress, and a UMAT was programmed to characterize nonlinear moisture and stress-sensitive relationship of sub grade soils.
51 citations
TL;DR: In this paper, the variation law of the dynamic resilient modulus of C&D waste under repeated freeze-thaw cycles was revealed and a reasonable performance prediction model was established.
49 citations
TL;DR: In this paper, the cumulative permanent strain of subgrade soils plays an important role in the pavement structure design and long-term pavement performance maintenance in Southern China, the hot and humid clima...
Abstract: The cumulative permanent strain of subgrade soils plays an important role in the pavement structure design and long-term pavement performance maintenance. In Southern China, the hot and humid clima...
39 citations
TL;DR: Wang et al. as mentioned in this paper determined the moisture contents of unsaturated clay embankments in southern China considering the stress state, and 6 frequency domain reflectometry sensors were installed in a widened embankment to monitor the moisture content.
Abstract: To determine the moisture contents of unsaturated clay embankments in southern China considering the stress state, 753 moisture data of three existing embankments for about 20 years were measured, and six frequency domain reflectometry sensors were installed in a widened embankment in southern China to monitor the moisture content. The soil water characteristic curve (SWCC) and stress-dependent soil water characteristic curves (SDSWCCs) were determined in the laboratory using a pressure plate apparatus and a stress-dependent parametric equation was established. The finite element model of a typical unsaturated clay embankment in southern China considering the SWCC and SDSWCCs was created. Then, the variation of the moisture contents of the clay embankment was simulated. The results show that the vertical stress has an obvious effect on the moisture distribution in embankments, especially the positions inside embankments where the vertical stress is large and cannot be neglected. The finite element model considering the SDSWCCs, therefore, should be selected when analyzing the moisture filed of embankments in southern China. For the existing clay embankments in southern China, their moisture contents gradually increase from the optimum moisture content to equilibrium values, which is close to the plastic limit and increases by 99% of the optimum moisture content. In addition, the resilient modulus values at different locations of the embankment and that of the whole embankment are reduced by 55 to 62%. And the safety factor of the slope obviously decreases, and its reduction is greater than 60%.
36 citations