振杆密实法在高烈度区液化地基处理中的应用研究  

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

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作  者:徐昊天 苟志孝 王正伟 戴梁 章定文[1] XU Haotian;GOU Zhixiao;WANG Zhengwei;DAI Liang;ZHANG Dingwen(School of Transportation,Southeast University,Nanjing 211189,China;Xin Jiang Road&Bridge Construction Group Co.,Ltd.,Urumqi 830000,China)

机构地区:[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

出  处:《防灾减灾工程学报》2024年第6期1439-1447,共9页Journal of Disaster Prevention and Mitigation Engineering

基  金:国家自然科学基金面上项目(52078129)资助。

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。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 liquefac-tion 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 re-inforcement 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 foun-dations 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,side-wall friction resistance and standard penetration number of the soil increased significantly.The com-pactness of the soil reached a medium density state,the liquefaction resistance improved,and the hori-zontal stress of the liquefiable soil layer increased significantly.(2)The reinforcement effect at the cen-troid of the three-point layout was significantly improved compared with other locations.(3)The deep-er 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 rein-forcing liquefiable foundation of the Gobi desert in high intensity area,effectively eliminating liquefac-tion,offering deep reinforcement,low costs,and good prospects for widespread application.

关 键 词:地基处理 振杆密实法 高烈度区 标准贯入 静力触探 

分 类 号:TU416.1[建筑科学—岩土工程]

 

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