Effect of frost-heave forces of soils on the bearing capacity of pyramidal piles

Bakholdin, B. V.; Kolesnikov, L. I.; Shikalovich, N. S.

doi:10.1007/bf02309483

Cited by 4 publications

(1 citation statement)

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“…The mechanical properties of soils after freeze-thaw cycling are directly related to the engineering performance of geotechnical structures such as the bearing capacity of foundations and the sliding resistance force in artificial and natural slopes [4,5,6]. Therefore, freeze-thaw stability is crucial for aeolian sand engineering, and the mechanical properties of this particular material can be improved by the hydration reaction of cement; this can be called cement improved aeolian sand (CIAS) and can indirectly be used as the filling material of foundations, thereby solving some engineering problems, such as mud boiling and pavement cracking [7,8].…”

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confidence: 99%

Effect of Freeze-Thaw Cycles on Triaxial Strength Property Damage to Cement Improved Aeolian Sand (CIAS)

Wang

et al. 2019

Materials

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Natural aeolian sand has the characteristics of low cohesion and poor water stability. In order to improve its crack resistance properties in the process of freeze-thaw cycles, P.O 42.5 ordinary Portland cement was added to form a mixture called cement improved aeolian sand (CIAS). SEM was used to analyze the microscopic micro-structure of CIAS at different times (7 days and 28 days). The mechanical properties of CIAS samples affected by freeze-thaw cycles were tested in a triaxial instrument, and gray-scale images of the three-phase distribution in the CIAS after freeze-thaw cycling were obtained by computed tomography (CT) scanning technology. The pore characteristic parameters (pore area, fractal dimension, and crack length) were studied by digital image process technique. Based on classical Griffith fracture theory, the development of the crack length and crack width with increasing freeze-thaw cycles is determined. Assuming that the pore area subordinates to the Weibull distribution, the parameters of the Weibull distribution, the damage evolution defined by the elastic modulus attenuation, and the pore area development of CIAS were determined. Research shows the cohesion decreases and internal friction angle increases with increasing cycle numbers. Three development patterns are observed: crack growth, crack closure, and crack merging, and the three patterns interact during freeze-thaw cycling. Furthermore, the fractal dimension of the pore edge fluctuates with the increasing number of freeze-thaw cycles. This work provides a theoretical basis for the application of aeolian sand and develops a method for disaster prevention in applications of freeze-thaw cycling.

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