宁通一级公路南通段软基处理研究

Strengthening of Soft Foundation of Nanjing Nantong Highway

分别对二灰土桩和排水板处理软基路段进行了实测和计算，结果表明：桩长４ ～６ ｍ 的二灰土桩处理方案使总沉降减少约３０ ｃｍ ，占总沉降量的３０ ％ ，工后沉降降低为６ ｃｍ ，从而满足工程要求；排水板预压处理的实测沉降比计算值稍大，是因插板时软土扰动的结果．两种处理方案相比，前者明显优于后者，二灰土桩的优越性在于初期它具有排水作用，因其可压密性和水硬性，后期强度增高，形成硬壳层，具有较高的压缩模量和较大的承载力．

Investigation and computation of settlement of soft foundation improved by lime flyash soil(LFS) piles and by plastic drain board are performed.The results show that the settlement of foundation wity LFS piles (4～6 m in depth)is reduced by 30cm,30% of the total settlement.And the warkable settlement is only 6cm,which satisfies the requirement of the highway project.The measured settlement of soft foundation improved by plastic drain board is larger than the computed value because the soft soil is disturbed.So the first method is better than the latter.The advantages of the highway soft foundation treatment with LFS piles include pervasiveness in its early stage,good compaction hydraulicity,and increase of modulus with curing time.