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| Experimental Research on Reinforcing Subgrade in Soft Soil Zone by Blasting Method |
| DENG Zhi-yong, ZHANG Zhi-yi |
| Railway Architecture Construction Research Institute of China Academy of Railway Sciences, Beijing 100000, China |
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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 analyzing 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 subgrade in soft soil zone by dynamic blasting method was presented, and the comparison and analysis of effective mechanics for reinforcing subgrade in soft soil zone by blasting method and strong compacting method were made. It was deduced theoretically blasting method was suitable for reinforcing subgrade in deep soft soil zone.
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Received: 30 April 2006
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2006, Vol. 23 
