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针对滨海新近吹填土地基存在的问题,以及在强夯加固前必须解决地下水位过高问题,提出两种解决方法:一是采取井点降水措施绝对降低地下水位后强夯,即高真空击密法;二是在原地基表面回填一定厚度砂土,相对降低地下水位后强夯,即常规强夯法.对以上两种工法在同一试验场地开展对比性试验研究.结果表明,施工过程中同一深度处高真空击密法场地的孔隙水压力始终小于常规强夯法场地;加固区的地基土强度和地基承载力明显提高,各级荷载作用下的沉降量明显减小.因此高真空击密法更适宜于滨海新近吹填土地基的加固.
Aiming at the problems existing in the coastal newly reclaimed land and the necessity of solving the problem of excessively high groundwater level before the compaction, two solutions are proposed: one is to take well point dewatering to reduce the groundwater level, The second is in the original ground surface backfill a certain thickness of sand, relative to reduce the groundwater level after dynamic compaction, that is, conventional dynamic compaction method.The above two methods in the same test site to carry out comparative experimental study.The results show that the same construction process The pore water pressure in the site of high vacuum compaction at depth is always less than that of conventional dynamic compaction; the strength of foundation soil and the bearing capacity of foundation in the reinforced area are obviously increased, and the settlement under each load is obviously reduced. Therefore, the high vacuum compaction Law is more suitable for the new coastal landfill reinforcement.