文中依托延安北过境线改建工程,将水泥土搅拌桩复合地基和抛石挤淤置换处理路段作为研究对象,施工现场安装沉降计、水位计和孔隙水压力计进行实地监测.对路基开始填筑至道路全面贯通的所有沉降数据进行整合分析,通过数值模拟的方法对该工程所选用的处理方案进一步评估修正.再按照控制沉降量的设计原则,对该复合地基合理优化.结果表明:当桩间距小于1.6 m时,拓宽侧路面不均匀沉降符合设计要求.为达到安全和经济的最佳效果,选择桩间距为1.5 m.
Monitoring of Roadbed Settlement and Optimization of Cement-soil Mixing Pile Composite Foundation
Relying on the reconstruction project of Yan'an North Transit Line,the composite founda-tion of cement-soil mixing pile and the road section treated by riprap squeezing and silting were taken as the research objects,and the settlement meter,water level gauge and pore water pressure gauge were installed on the construction site for field monitoring.All the settlement data from the beginning of subgrade filling to the full penetration of the road were integrated and analyzed,and the treatment scheme selected for this project was further evaluated and revised by numerical simulation.According to the design principle of controlling settlement,the composite foundation was optimized reasonably.The results show that when the pile spacing is less than 1.6 m,the uneven settlement of the widened side pavement meets the design requirements.In order to achieve the best effect of safety and econo-my,the pile spacing is 1.5 m.
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