吹填土初始泥浆对抗液化强度CRR值影响规律理论研究
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1.中国冶金地质总局青岛地质勘查院 山东省青岛市;2.中国海洋大学 环境科学与工程学院

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P315

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国家自然科学基金面上(41976049)中国冶金地质总局山东局青年科技(SDYJ-QNKY202008)


Theoretical study on the influence law of initial mud on CRR value of formation liquefaction index
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Shandong bureau of China Metllurgical Geology Bureau

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    摘要:

    为了分析吹填土初始泥浆(原浆)对吹填后不同深度地层的在地震作用下的抗液化强度CRR值的影响。根据土力学、流体力学和颗粒分选等理论推导出基于吹填土初始泥浆FC值影响下吹填土不同地层的液化指标CRR值变化规律表达式。因此首先基于吹填土颗粒接触状态阈值FCth对细颗粒含量FC对土体CRR值影响进行分类讨论,并结合颗粒自然分选理论,建立吹填土初始泥浆FC值影响吹填土液化指标CRR值变化规律表达式,最后根据现场勘察数据分析其理论模型的可靠性。结果表明:原浆-沉积分层CRR值计算模型能够较好的描述吹填土初始泥浆影响沉积后地层CRR值的变化规律,当FC≥FCth时,粉颗粒参与土骨架构建,对于CRR值呈现出非单调的变化规律,土的性质也由砂土向粉土转变。

    Abstract:

    In order to analyze the influence of dredger fill initial mud (original mud) on the anti-liquefaction strength CRR value of different strata after dredger fill under earthquake, according to the theories of soil mechanics, fluid mechanics and particle sorting. The expression of the variation law of dredger fill liquefaction index CRR value in different strata under the influence of dredger fill initial mud FC value is derived. Firstly, based on the threshold FCth of dredger fill particle contact state, the influence of fine particle content FC on soil CRR value is classified and discussed, and combined with the theory of particle natural separation, the expression of the change law of dredger fills initial mud FC value affecting dredger fill liquefaction index CRR value is established. Finally, according to the field investigation data, the reliability of the theoretical model is analyzed. The results show that the calculation model of initial slurry-sediment stratification CRR value can be well described the rule of the influence of hydraulic filling initial slurry on the CRR value of post-deposition formation. When FC≥FCth, silty soil participates in the construction of the soil skeleton, it is shown a non-monotonic change rule for the CRR value, and the nature of the soil also have embodied the trend of the sand to silt.

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张巍巍,袁延召,王彦军,等. 吹填土初始泥浆对抗液化强度CRR值影响规律理论研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-17
  • 最后修改日期:2022-03-28
  • 录用日期:2022-04-30
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