吹砂回填软土地基预处理方案的论证与选取

Demonstration and selection of pretreatment program of blowing sand and backfill for soft clay foundation

对于沿海、江河滩涂吹填砂土造地的火电厂厂址,建设者面临的首要任务是如何克服欠固结的软弱沉陷地基条件进入场地,开展前期的岩土勘探和后续的建(构)筑物施工准备,这就要求对吹填后的软土地基进行预处理,以满足施工机械进场和后续开挖施工对场地稳定的要求.场地预处理的方法很多,涉及经济性、工期要求和处理效果等多方面的因素;如何结合场地条件,论证选取适合的预处理方案,以期达到经济、工期和效果的最优组合,这是每个设计工程师所期盼的.通过某火力发电工程吹砂回填软土地基预处理方案的论证对比,介绍了该工程场地预处理方案的选取方法、要求和结果,对类似工程建设具有参考价值.

Regarding to thermal power plant site requiring blowing and backfill sand soil to form land near the sea and river beach,the first important task that the constructors have to face is to avoid the condition of weak subsidence foundation with under consolidated soil;to carry on the prior period ground investigation and follow-up preparation for structural construction,all of which require the pretreatment to the soft soil foundation after blowing and filling sand,so as to satisfy the stablity requirement of approach of construction machinery and follow-up excavation.There are many site pretreatment methods,involving economy,construction period limit requirements and treatment effect and so on.According to the site condition,to demonstrate and select proper pretreatment program so as to satisfy the requirement of economy,construction and treatment effect at the same time is looked forward to by every design engineer.The selection method,requirement and result of site pretreatment programs are described by comparing several pretreatment programs of blowing sand and backfill in soft soil foundation and sharing the experience and results of foundation pretreatment.