广州软土的工程特性及地基处理方法的对比研究

Study on the Engineering Properties and the Suitable Treatment Methods of Guangzhou Soft Soil

通过对大量广州软土的试验资料分析,总结出广州软土的工程特性并与上海软土进行对比.广州软土具有厚度变化大、含水量高、孔隙比大、压缩性高、抗剪强度低、夹有较多的粉细砂、与其它地区软土相比固结速度快的特点.针对广州软土的工程特性并结合京珠高速公路广珠段软土地基试验工程的多种地基处理方法的对比研究提出,广州软土地基采用排水固结法处理效果良好;采用深层搅拌桩处理后,沉降量减小为原地基沉降量的20%左右,且沉降在加载后120 d已基本完成,深层搅拌桩法为快速处理广州软土地基的有效方法.

The typical engineering characteristics of Guangzhou Soft Soil are summarized and a comparison between Guangzhou Soft Soil and Shanghai Soft Soil is shown. Varied depth, high water content, high void ratio, high compressibility, low shear strength and especially high consolidation coefficient are typical characteristics of Guangzhou Soft Soil. On the basis of the characteristics of Guangzhou soft soil and the contrast between ground treatment methods in Guangzhou-Zhuhai expressway, more suitable ground treatment methods for Guangzhou Soft Soil are proposed. Consolidation and deep mixing pile are more effective ground treatment methods. The settlement of treated ground by deep mixing method is about 20 % settlement of the same ground untreated and it is completed in 120 days.