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Capacity and failure mechanism of laterally loaded jet-grouting reinforced piles: Field and numerical investigation

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Abstract

This study presents the results of field and numerical investigations of lateral stiffness, capacity, and failure mechanisms for plain piles and reinforced concrete piles in soft clay. A plastic-damage model is used to simulate concrete piles and jet-grouting in the numerical analyses. The field study and numerical investigations show that by applying jet-grouting surrounding the upper 7.5D (D = pile diameter) of a pile, lateral stiffness and bearing capacity of the pile are increased by about 110% and 100%, respectively. This is partially because the jet-grouting increases the apparent diameter of the pile, so as to enlarge the extent of failure wedge and hence passive resistance in front of the reinforced pile. Moreover, the jet-grouting provides a circumferential confinement to the concrete pile, which suppresses development of tensile stress in the pile. Correspondingly, tension-induced plastic damage in the concrete pile is reduced, causing less degradation of stiffness and strength of the pile than that of a plain pile. Effectiveness of the circumferential confinement provided by the jet-grouting, however, diminishes once the grouting cracks because of the significant vertical and circumferential tensile stress near its mid-depth. The lateral capacity of the jet-grouting reinforced pile is, therefore, governed by mobilized passive resistance of soil and plastic damage of jet-grouting.

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He, B., Wang, L. & Hong, Y. Capacity and failure mechanism of laterally loaded jet-grouting reinforced piles: Field and numerical investigation. Sci. China Technol. Sci. 59, 763–776 (2016). https://doi.org/10.1007/s11431-016-6014-5

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  • DOI: https://doi.org/10.1007/s11431-016-6014-5

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