振杆密实法在高烈度区液化地基处理中的应用研究∗
作者:
作者单位:

1.东南大学交通学院,江苏 南京 211189 ; 2.新疆路桥建设集团有限公司,新疆 乌鲁木齐 830000

作者简介:

徐昊天(1999—),男,硕士研究生。主要从事地基处理研究。E-mail:220213362@seu.edu.cn

通讯作者:

中图分类号:

TU416.1

基金项目:

国家自然科学基金面上项目(52078129)资助


Study on the Application of Vibrating Rod Compaction Method in the Treatment of Liquefied Foundation in High Intensity Area
Author:
Affiliation:

1.School of Transportation, Southeast University, Nanjing 211189 , China ; 2.Xin Jiang Road & Bridge Construction Group Co., Ltd., Urumqi 830000 , China

Fund Project:

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    摘要:

    喀什地区地处我国最西部,地震烈度高,戈壁荒漠分布广泛,区域内土壤在地震作用下极易发生液化。以喀什地区G314喀什过境段公路工程为依托,分别采用振杆密实法和碎石桩加固高烈度可液化场地,通过静力触探 (CPT)和标准贯入试验(SPT)评价加固效果,研究叠加效应对加固效果的影响和振动前后土体水平应力的变化, 证明十字翼形振杆密实法技术处理高烈度区(Ⅷ度区)戈壁滩可液化地基具有良好的适用性。原位测试结果表明: (1)振杆密实法加固后,土体的锥尖阻力、侧壁摩阻力和标贯击数显著增加,土体的密实度达到中密状态,抗液化水平提高,可液化土层的水平应力显著增加;(2)三点形心处的加固效果相较其他位置有明显提升;(3)处理深度越深,振杆密实法处理效果相较碎石桩提升越显著。振杆密实法加固高烈度区戈壁滩可液化地基效果明显,消除液化效果优良、加固深度大、造价低,具有良好的推广应用前景。

    Abstract:

    The Kashgar region, located in the most western part of China, is characterized by high seismic intensity and extensive presence of the Gobi desert. The soil in this region is prone to liquefaction under the action of earthquakes. The study used the G314 Kashgar transit section highway project as a basis, adopting the vibrating rod compaction method and gravel piles to reinforce high-intensity liquefiable sites. The reinforcement effect was evaluated by static cone penetration test (CPT) and standard penetration test (SPT). The study examined the impact of the superimposed effect on the reinforcement and the change in horizontal stress of the soil before and after the vibration, demonstrating the good applicability of the cross-wing vibrating rod compaction method for treating liquefiable foundations in the Gobi desert of high-intensity areas (VIII-degree areas). The in-situ test results showed that : (1) After reinforcement using the vibrating rod compaction method, the cone tip resistance, sidewall friction resistance and standard penetration number of the soil increased significantly. The compactness of the soil reached a medium density state, the liquefaction resistance improved, and the horizontal stress of the liquefiable soil layer increased significantly. (2) The reinforcement effect at the centroid of the three-point layout was significantly improved compared with other locations. (3) The deeper the treatment depth, the more significant the treatment effect of vibrating rod compaction method was compared with the gravel pile. The vibrating rod compaction method has proven effective in reinforcing liquefiable foundation of the Gobi desert in high intensity area, effectively eliminating liquefaction, offering deep reinforcement, low costs, and good prospects for widespread application.

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引用本文

徐昊天,苟志孝,王正伟,戴梁,章定文.振杆密实法在高烈度区液化地基处理中的应用研究∗[J].防灾减灾工程学报,2024,44(6):1439-1447

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  • 收稿日期:2023-09-14
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  • 在线发布日期:2025-01-13
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