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      저자 : Xuechao Wang (검색결과 1 건)
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        Compression Characteristics of Ultra-soft Clays Subjected to Simulated Staged Preloading

        Huayang Lei,Xuechao Wang,Li Chen,Maosong Huang,Jie Han 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2

        Ultra-soft soils have high water content, low strength, and high compressibility. Staged preloading has been commonly used in China to improve ultra-soft soils during land reclamation before highways and other structures are constructed. In this study, seven series of one-dimensional consolidation tests were performed on undisturbed, remolded, or reconstituted specimens of three types of soils subjected to simulated, staged loading. Test results showed that the compression curves had two straight lines, which intersected at a yield stress. Burland’s concept of the intrinsic compression line was adopted to present the compression curves of reconstituted clays at different initial water contents. The intrinsic compression line was modified to better fit the test data for the stresses lower than 40 kPa. The coefficient of soil consolidation increased with an increase of the effective vertical stress as a result of the rate of increase in constrained modulus higher than that of decrease in permeability. The maximum coefficient of secondary consolidation, Cámax, was correlated with the ratio of the initial void ratio to the void ratio at yield stress by a unique curve, which was proposed to distinguish the pre-yield stress from the post-yield stress state. Test results showed that the secondary compression characteristics depended on the applied stress and the initial void ratio.

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