基于SPT-APD-DDA的砂土液化评价方法研究
DOI:
作者:
作者单位:

1.昆明理工大学;2.昆明理工大学,云南省地质矿产勘查开发局

作者简介:

通讯作者:

基金项目:

国家自然科学(40961001)


Evaluation method of sand liquefaction based on SPT-APD-DDA
Author:
Affiliation:

Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming

Fund Project:

The National Natural Science Foundation of China(40961001)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    传统的规范法在建立经验判别准则过程中存在大量不确定性因素,工程中亟需针对复杂场地液化判别方法的综合性研究。通过对上海市包头路段沉管抢修项目49组砂土土样的研究,在标准贯入试验法(SPT)定性评价的基础上采用提出的绝对差值百分比法(APD),划分出35组判别结果精确及14组存在判别误差的土样。借鉴判别分析理论思想,将平均粒径D50、不均匀系数Cu、比贯入阻力Ps、标准贯入点深度ds、地下水埋深dw和标准贯入锤击数N63.5等物理力学参数加入液化评价,利用精确土样建立适宜研究区工程地质特性的距离判别分析模型(DDA),对14组存在判别误差或失误的土层进行定量评价。研究结果表明:建立的砂土液化综合评价体系对研究区具有较强的针对性与适应性,从多角度全面、客观地评价了研究区砂土液化情况。最终通过合理的抗液化沉陷措施,保障了后续工程的稳步进行,为类似地质条件场区的砂土液化稳定性评价提供参考和借鉴。

    Abstract:

    There are a lot of uncertainties in the establishment of traditional normative methods,so a comprehensive research method is urgently needed to discuss the liquefaction discrimination in complex sites. Based on the emergency repair project of the immersed pipe in Baotou section in Shanghai,this paper first adopts the standard penetration test method (SPT) to qualitatively evaluate the sandy silt soil within 20 meters of the research area. Using the absolute difference percentage method (APD) proposed in this paper,35 groups of soil samples with accurate discriminant results and 14 groups with discriminant errors are divided. Secondly,referring to the theoretical thought of discriminant analysis and the theoretical thought of discriminant analysis, the physical and mechanical parameters such as average particle size D50, heterogeneous coefficient Cu,specific penetration resistance Ps,standard penetration point depth ds,groundwater burial depth dw and standard penetration hammer number N63.5 are added to the liquefaction evaluation. Using the soil samples with accurate discriminant results,a distance discriminant analysis model (DDA) suitable for the engineering geological characteristics of the research area is established to quantitatively evaluate the soil layers with discriminant errors or errors. Finally,choose the discriminant results based on the results of the "advantage combination". The research results show that the established comprehensive evaluation system for sand liquefaction is highly pertinent and adaptable to the research area. It is established that 37 groups of the 49 groups of sand and soil layers in the research area are liquefied. Through reasonable anti-liquefaction and subsidence measures,the steady progress of subsequent projects are guaranteed,which is stable for sand liquefaction in fields with similar geological conditions. The evaluation provides reference and reference.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2022-01-05
  • 最后修改日期:2022-07-01
  • 录用日期:2022-07-08
  • 在线发布日期: 2022-11-10
地质灾害机理与防治新技术”专栏征稿通知
关闭