施工顺序对软土地坪复合地基的影响探讨

场地回填土与搅拌桩施工顺序将直接影响软土地坪复合地基的处理效果,其中沉降控制是影响地坪安全运行的关键。以近海软土地区工业厂房水泥土搅拌桩复合地基工程为例,探讨了复合地基水泥土搅拌桩、回填土两种不同施工顺序的影响因素及相应处理效果;通过数值模拟试验,计算分析了不同填土厚度下两种工况的地基固结总沉降、施工沉降、工后沉降。结果表明,采用“先土后桩”的施工顺序的施工期沉降大于“先桩后土”,但工后沉降大大减小,提高了软土地坪地基处理效果,有利于处理后地坪的安全运行,验证了前述分析结论,为合理设计方案的确定提供了重要的参考依据。

Discussion on Influence of Construction Sequence on Soft Ground Composite Foundation

The construction sequence of backfill soil and mixing piles on the site will directly affect the treatment effect of the soft ground composite foundation,and the settlement control is the key to the safe operation of the soft ground floor.Taking the composite foundation engineering of cement-soil mixing piles for industrial plants in offshore soft soil areas as an example,the influencing factors and settlement differences of two different construction sequences of composite foundation cement-soil mixing piles and backfilling soil are discussed.Total settlement,construction settlement and post-settlement of foundation consolidation under two conditions are calculated and analyzed through numerical simulation tests.The results show that the settlement during construction by using the construction sequence of“backfill soil first,then pile”is greater than the“pile first,then backfill soil”,but the settlement after construction is greatly reduced,which improves the effect of soft ground foundation treatment and is beneficial to the safety of the soft ground after treatment.The foregoing analysis conclusions is verified by the operation,which provides an important reference for determining a reasonable design scheme.