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| ACCIDENT ANALYSIS OF DYNAMIC COMPACTION IN GROUND IMPROVEMENT OF AN INDUSTRIAL PARK IN ZHEJIANG PROVINCE |
| ZHANG Zhongmiao1，2，ZHANG Qianqing1，2，WANG Huaqiang1，2 |
(1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；
2. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China) |
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Abstract An accident which is caused by the dynamic compaction in ground improvement of workshop #1 in an industry park in Zhejiang province，is analyzed；and the measures for reinforcing independent bearing platform and site ground are proposed. The analysis shows that the large discrepancy in the thickness of fill layer，the substratum with relatively low strength in deeper depth，the limitation of reinforcing depth of dynamic compaction，and some parts of this site with insufficient ramming energy are all the main causes of the accident. Therefore，the dynamic compaction is not suitable to be alone applied in ground improvement of a site with a large discrepancy in the thickness of the same soil layer and the substratum with relatively low strength at deeper depth. After the entire independent bearing platforms have been adjusted to a unified elevation，piles are used to reduce the settlement of independent bearing platforms；and the ground of the site can be reinforced by cement slurry in order to eliminate its post-construction settlement in the thicker soil layer.
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Received: 19 March 2010
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2011, Vol. 30 
