爆炸法加固软土地基的试验研究

Experimental Research on Reinforcing Subgrade in Soft Soil Zone by Blasting Method

研究目的：尝试在软土地基处理进程中取代强夯产生的动载荷的新方法。研究方法：本文通过宁启铁路线DK172＋000～DK172＋200段软土路基现场试验，对比分析爆炸法和堆载预压法处理饱和软土地基的固结效果。通过地表沉降、全断面沉降、侧向位移的现场观测结果分析，获得了爆炸后软土地基的沉降规律。研究结果：证明了爆炸法可以达到软土地基加固处理的效果，并且地表沉降速率加快，有利于缩短软基固结处理时间。研究结论：文中提出爆炸动力固结法处理软土地基的工艺过程，并对爆炸法和强夯法等动力固结处理软土地基的作用机制进行了比较分析，理论上推断爆炸法比较适宜对深层软土地基的加固处理。

Abstract：Research purposes： The purposes were to use a new method experimentally for reinforcing subgrade in soft soil zone, by which the dynamic load caused by strong compacting could be eliminated in course of reinforcement.Research methods：The comparison and analysis were made for consolidation results of reinforcing subgrade in saturated soft soil zone by adopting blasting method and heaped pre -loading method through making site experiment on reinforcing subgrade in soft soil zone in section of DK 172 ＋ 000 ～ DK 172 ＋ 200 on Nanjing - Haining Railway Line. The post - blasting settlement law of subgrade was obtained by analysing site observation results of surface settlement, full section settlement and lateral displacement.Research results：It was shown the good result of reinforcing subgrade in soft soil zone could be obtained by adopting blasting method, with speeding up surface settlement which was helpful for shortening the time of consolidating and reinforcing subgrade in soft soil zone.Research conclusions：The process of reinforcing subgTade in soft soil zone by dynamic blasting method was presented, and the comparison and analysis of effective mechanics for reinforcing subgTade in soft soil zone by blasting method and strong compacting method were made. It was deduced theoretically blasting method was suitable for reinforcing subgTade in deep soft soil zone.