强夯加固废弃铁矿渣路基的动应力扩散规律实验研究

山东大学学报(工学版) ›› 2012, Vol. 42 ›› Issue (1): 87-92.

强夯加固废弃铁矿渣路基的动应力扩散规律实验研究

孟祥彬¹,姚凯^2*,吴庆东³,刘吉山³,窦志刚²

1.山东大学齐鲁医院基建处, 山东济南 250012;
2.山东大学土建与水利学院, 山东济南 250061;
3.山东省路桥集团有限公司,山东济南 250021

收稿日期:2011-06-06 出版日期:2012-02-20 发布日期:2011-06-06
通讯作者: 姚凯(1988- ),男,山东临沂人,硕士研究生,主要研究方向为地基处理,路面病害等. Email: yz20032006@163.com E-mail:yz20032006@163.com
作者简介:孟祥彬(1975- ),男,山东成武人,工程师,主要研究方向为建筑工程管理. Email:wasai2003@126.com
基金资助:
山东省自然科学基金资助项目(Y2007F35)

Test study on soil dynamic stress diffusion of a waste iron slag embankment during dynamic consolidation

MENG Xiang-bin¹, YAO Kai^2*, WU Qing-dong³, LIU Ji-shan³, DOU Zhi-gang²

1. Infrastructure Management Department of Qilu Hospital of Shandong University, Jinan 250012, China;
2. School of Civil Engineering, Shandong University, Jinan 250061, China;
3. Shandong Luqiao Group Co. Ltd, Jinan 250021, China

Received:2011-06-06 Online:2012-02-20 Published:2011-06-06

摘要/Abstract

摘要：

结合青临高速公路强夯加固废弃铁矿渣高填方路基工程,在实验段埋设48个土压力计,采用不同夯击能(2000、2250、2500、2800kN·m)对设计夯点进行多次夯击,通过采集仪得到的数据,分析强夯时动应力的扩散规律。实验结果表明:强夯加固废弃铁矿渣路基的效果比较明显,强夯引起的动应力也很明显;锤底动应力的消散速度极快,加上余波仅有05s左右的时间;不同夯击能引起的动应力不同,夯击能越大,动应力值也越大;动应力在竖向的影响距离远大于径向,锤底8m仍有10kPa以上的动应力;有效加固深度的临界动应力值为20kPa;动应力在径向的衰减速度快于竖向,有效加固宽度约3m;随着夯击次数的增加,在有效加固范围内动应力的增加比较明显,但在3击后基本保持稳定。实验结果可为今后相似条件下强夯加固工程施工参数的设计提供参考。

关键词: 强夯, 废弃铁矿渣, 动应力, 实验研究

Abstract:

A large field test was conducted in the project of the Qing-Lin Expressway. Forty-eight soil pressure cells were embedded in the test section of the road. Different classes of tamping energy(2000, 2250, 2500, 2800kN·m) were used in this test. A dynamic strain gauge was used to record the dispersion and decay of the stress caused by dynamic compaction. The results showed that the reinforce effect on the waste iron slag embankment and the dynamic stress were both obvious. The dynamic stress decayed very fast and increased with the tamping energy. The vertical influence distance of dynamic stress was larger than that of the horizontal, and the dynamic stress was more than 10kPa at 8m under the rammer. The critical dynamic stress of the effective impacting depth was about 20kPa. The decay speed of the horizontal dynamic stress was faster than that in the vertical. The effective horizontal impacting distance was about 3m. With the compaction numbers increased, the dynamic stress in the reinforced range obviously increased and tended to be stable after about the third hit.

Key words: dynamic consolidation, waste iron slag, soil dynamic stress, test study

孟祥彬1,姚凯2*,吴庆东3,刘吉山3,窦志刚2. 强夯加固废弃铁矿渣路基的动应力扩散规律实验研究[J]. 山东大学学报(工学版), 2012, 42(1): 87-92.

MENG Xiang-bin1, YAO Kai2*, WU Qing-dong3, LIU Ji-shan3, DOU Zhi-gang2. Test study on soil dynamic stress diffusion of a waste iron slag embankment during dynamic consolidation[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2012, 42(1): 87-92.

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