共振法加固公路可液化地基试验

Resonance Compaction Method for Highway Ground Improvement at Liquefaction Site

针对目前中国在可液化地基处理中存在的问题,研究开发了一种新的液化地基处理方法——十字形振动翼共振法;结合工程实例,现场测试分析了十字形振动翼共振法施工产生的超静孔压分布规律和发生过程、施工时地表振动影响范围;分别采用孔压静力触探试验、剪切波速试验和标准贯入试验对加固前后的地基抗液化性能进行了评价。结果表明:十字形振动翼共振法可有效加固可液化地基,消除液化,且施工方便、速度快、造价低、加固深度大、对环境振动影响小,具有良好的推广应用前景。

On the basis of the review of the current treatment methods for liquefiable foundation,a new ground improvement method at liquefaction site named crisscross section vibratory probe resonance compaction method was developed.The field tests were carried out to assess the quality control of resonance compaction method.The distribution and variation of excess pore pressure were recorded during vibration construction process.Ground influence range by vibration was analyzed.Comparison tests including the piezo cone penetration test,shear wave velocity measurement and standard penetration test before and after improvement had been carried out to assess the anti-liquefaction capability.The results indicate that the resonance compaction method with crisscross section vibratory probe is an effective way for liquefaction mitigation,and this method is simple and fast,with low cost and slight vibration effect on environment.Hence,it has a good application prospect for liquefiable ground improvement.