高速公路软基路堤填筑期安全监测分析

Investigation on the Safety Monitoring of the Highway Section on Soft Foundation in Construction Period

广东深汕高速公路某段路堤为软土地基，采用袋装砂井加预应力土工布或土工格栅来进行排水预压加固处理。填筑期的安全监测分析研究成果表明：由于施打砂井土体扰动，地基土强度降低20％左右；路堤填筑期结束，土体团结度为66．3％；采用土工布或土工格栅加固地基，能调整地基应力，均化应力分布，提高地基承载力，减少地基失稳机率。最后对施工控制指标进行了探讨。

One of the sections of Shen-San HighWay in Guangdong Province is built on a soft foundation treated with sand columns and geofabric or geogrid for drainage, pre-pressing and strengthening. This paper shows the results of investigation on the safety monitoring of the section in construction period. It is indicated that the strength of the base soil reduces roughly by 20% due to the disturbance during the construction of sand columns, and by the end of the period, the consolidation degree of the ground is 66.3%. It is also shown that using geofabric or geogrid to strengthen the foundation can result in good redistribution of the stress in foundation and raising the beating capacity of the foundation and lowering the possibility of instability. At last, the construction indexes are given.