深层软基加固处理方案试验研究

Experimental research on consolidation of deep soft foundations

在软土地区既有铁路线旁修建复线时,为控制施工期沉降与工后沉降,保证既有线路与新建线路的稳定性,对新建复线的深层软基加固区,通过现场试验采用6种方法分7个观察项目进行了对比研究。试验结果表明:无论是沉降分析、稳定分析或是对既有线的影响分析,用粉喷桩加固地基比用砂井、插塑板及土工布加固地基均有着显而易见的优越性,相对来说短而密的粉喷桩较长而疏的粉喷桩加固效果更好。

When a new railway line will be constructed along the existing one, in order to control settlements of construction period and post-construction period, and to ensure stability of existing line and the new one, comparative analysis is performed in seven projects with six methods in in-situ test. The results of settlement analysis, stability analysis and consequence analysis of existing line show that dry jet mixing piles are superior to sand well, prefabrication drains and geotextiles in consolidating foundation. Relatively, dry jet mixing pile with short length and small interval has better consolidation effect than the longer length and larger interval one.