不同雨型条件下围堰边坡渗流稳定性分析研究
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1.江西省交通科学研究院有限公司;2.华东交通大学

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国家自然科学基金项目(52108320、52068033);江西省自然科学基金面上项目(20202BABL204067);江西省交通运输厅科技项目(2021H0042、2020Z0001)


Study on seepage stability of cofferdam slope under different rain rainfall types
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Project (52108320、52068033) supported by the National Natural Science Foundation of China ;Project ( 20202BABL204067) supported by the National Science Foundation of China;Projects ( 2021H0042;2020Z0001) supported by the Science and technology projects of Jiangxi Provincial Department of transportation.

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    摘要:

    为分析降雨渗流对围堰稳定性的影响,依托江西省某航电枢纽项目,以非饱和渗流理论为基础,运用Geo-Studio数值模拟软件对不同降雨条件下围堰的渗流情况和稳定性进行模拟分析,得到不同雨型条件下围堰稳定性的变化情况。研究结果表明:降雨对堰体影响具有滞后性,不同雨型对堰体强度滞后性的影响由大到小依次为:后峰型、均匀型、中峰型、前峰型,且滞后性受降雨强度影响;降雨入渗作用受降雨峰值出现的时间影响,堰体的安全系数随降雨强度峰值出现而骤减;相比初始稳定条件,前锋型降雨对围堰稳定性影响最小,后峰型降雨对围堰稳定性影响最大;坡内土体在前期降雨影响下渗透系数会处于一个高水平状态,此时围堰抵抗突发强降雨的能力将随渗透系数的升高而减弱。

    Abstract:

    In order to analyze the influence of rainfall seepage on the stability of cofferdam, relying on an navigation-power junction project in Jiangxi Province, based on the unsaturated seepage theory, we simulate and analyze the condition of the seepage and the stability of cofferdam under different rainfall conditions by using the Geo-studio numerical simulation software, and the influence of different rain patterns on the stability of cofferdam is obtained. The results show that the influence of rainfall on the cofferdam has a hysteretic quality. The influence of different rainfall types on the strength hysteresis of weir body is as follows: rear peak type, uniform type, middle peak type and front peak type, and the hysteresis is affected by rainfall intensity. The rainfall infiltration is affected by the time of the peak rainfall, and the safety factor of the cofferdam decreases sharply with the peak rainfall intensity. Compared with the initial stability conditions, the front peak type rainfall has the least impact on the stability of the cofferdam, and the rear peak rainfall has the greatest impact on the stability of the cofferdam. Under the influence of early rainfall, the permeability coefficient of soil in the slope will be at a high level. At this time, the ability of Cofferdam to resist sudden heavy rainfall will weaken with the increase of permeability coefficient.

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  • 收稿日期:2022-03-28
  • 最后修改日期:2022-05-18
  • 录用日期:2022-05-20
  • 在线发布日期: 2022-10-11
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