Settlement characteristic of large-diameter steel pipe pile in weathered phyllite overlying calcareous sand
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    Abstract:

    Based on a contrastive analysis of simulated load-settlement curve from high strain dynamic test and measured load-settlement curve from static load test,we can obtain the settlement characteristic of large-diameter steel pipe pile in weathered phyllite overlying calcareous sand. The analysis results show that when the pile penetrates through a thin layer of calcareous sand and goes deep enough in the highly weathered hard phyllite,the settlement under the applied load is mainly caused by compression of the pile and the residual settlement is small. Both the high strain dynamic test and static load test are difficult to mobilize the soil resistance sufficiently. On the contrary,the settlement of pile under the ultimate pile load is large and residual settlement is also large when the pile penetrates through deep calcareous sand and just bears in the highly weathered soft phyllite. Soil resistance can be given full play in both high strain and static load tests. According to the analysis results,the thickness of calcareous sand has little effect on the ultimate bearing capacity of steel test pipe pile which mainly depends on the embedded length of highly weathered phyllite and strength of bearing stratum.

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苏世定,陈章宇,桑登峰.千枚岩上覆钙质砂层大直径钢管桩沉降特性分析*[J].水运工程,2021,(2):150-154

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  • Online: February 03,2021
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