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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第5期    总第61期    2014年10月

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文章编号:1672-7029(2014)05-0118-07
强夯法处理娄新高速公路岩溶塌陷地基的现场试验研究
胡涛1,魏婷2,张超2,乔世范23

(1. 贵州省公路工程集团有限公司总工办, 贵州 贵阳 550008; 
2.兵团兴新职业技术学院 建筑工程系,新疆 乌鲁木齐 830074;
3. 中南大学 土木工程学院,湖南 长沙 410075
)

摘 要: 以娄新高速公路岩溶塌陷地基强夯加固工程为背景,对强夯法的主要参数设计、强夯试验和强夯加固岩溶地基效果进行分析。分别采用2 000 kN·m、4 000 kN·m夯击能进行强夯试验,并对夯坑的每击夯沉量、总夯沉量及夯坑周围地面隆起变形量和影响范围进行监测。试验结果表明:在4 000 kN·m夯击能下最佳夯击次数为11击,夯实效率达到90%以上,远高于2 000 kN·m夯击能的夯实效率,可以有效地加固岩溶塌陷地基。强夯后动力触探击数明显增加,1~12 m变化明显,表明4 000 kN·m夯击能的影响深度达到了12 m。

 

关键字: 岩溶塌陷;强夯法;夯击能;动力触探

Experimental study on dynamic compaction method applied in karst collapse foundation of Lou -Xin expressway
HU Tao1, WEI Ting2, ZHANG Chao2, QIAO Shifan2,3

1. Guizhou Highway Engineering Group Co., Ltd, Chief Engineer Office, Guiyang 550008, China;
2. Bingtuan Xingxin Vocational and Technial College, Urumqi 830074, China;
3. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Taking the project of karst collapse foundation treated by dynamic compaction in the construction of Lou-Xin expressway as an example, main parameters of dynamic compaction method, dynamic compaction test and its effects were analyzed. The test was conducted when 1000 kN·m and 4000 kN·m tamping energy were adopted. Meanwhile, the measurement work was also performed, including each tamping settlement of the tamped area, total settlement, ground uplift deformation around the tamping pit and influence scope. The results indicate that the optimum tamping times were 11 when 4 000 kN·m tamping energy was adopted. The compaction efficiency achieves more than 90%, which is much higher than that when 2 000 kN·m tamping energy was utilized. It could reinforce the karst collapse foundation effectively. Taming number of dynamic penetration after dynamic compaction increases obviously, which changes vastly from 1 to 12m in depth. It shows that the effective influence depth of 4 000 kN·m tamping energy reaches the depth of 12 meters.

 

Key words: karst collapse; dynamic compaction method; tamping energy; dynamic penetration

ISSN 1672-7029
CN 43-1423/U

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