高填方土石混合料强夯振动响应及加固机理研究
|
摘要
基于土石混填料强夯加固的大型现场振动速度测试的试验成果,深入地分析了质点振速和波形在强夯过程中的传播及演化,以此研究了1000 kN·m夯击能作用下土石料填筑体的内部质点的振动响应及强夯加固机理。结果表明:土石料在强夯作用下土体内部仅有冲击波和振动波两种振动形态;提出了强夯起始加固临界振速的概念和确定方法,并给出相应的振速值;通过分析填筑体空间振速演化规律,阐述了粗粒土石混合料的强夯加固机理,将强夯过程分为加固发展阶段和加固退化阶段。为工程条件下强夯施工层厚给出指导性建议。
Based on the large-scale field tests on the vibration velocity caused by dynamic compaction in soil-aggregate mixtures, the propagation and evolution of particle amplitude and waveform in the process of dynamic compaction are analyzed,then the vibration response and reinforcement mechanism of the internal particles in soil-aggregate fills under the tamping energy of 1000 kN·m are studied. The results show that there are only two vibration forms, shock wave and vibration wave, in the soil-aggregate mixtures under the action of dynamic compaction. Then, the concept and method of the critical elastic vibration velocity of soil-aggregate mixtures are proposed, and the corresponding critical elastic vibration values are given. The expansion rules of each area with the times of ramming are given by the evolution laws of spatial vibration velocity. Finally, the reinforcement mechanism of dynamic compaction of coarse-grained soil-aggregate mixtures is expounded, the reinforcement process is divided into four stages, and the guiding suggestions for the layer thickness under dynamic compaction in the construction are proposed.
Based on the large-scale field tests on the vibration velocity caused by dynamic compaction in soil-aggregate mixtures, the propagation and evolution of particle amplitude and waveform in the process of dynamic compaction are analyzed,then the vibration response and reinforcement mechanism of the internal particles in soil-aggregate fills under the tamping energy of 1000 kN·m are studied. The results show that there are only two vibration forms, shock wave and vibration wave, in the soil-aggregate mixtures under the action of dynamic compaction. Then, the concept and method of the critical elastic vibration velocity of soil-aggregate mixtures are proposed, and the corresponding critical elastic vibration values are given. The expansion rules of each area with the times of ramming are given by the evolution laws of spatial vibration velocity. Finally, the reinforcement mechanism of dynamic compaction of coarse-grained soil-aggregate mixtures is expounded, the reinforcement process is divided into four stages, and the guiding suggestions for the layer thickness under dynamic compaction in the construction are proposed.
引文
[1]高政国,杜雨龙,黄晓波,等.碎石填筑场地强夯加固机制及施工工艺[J].岩石力学与工程学报,2013,32(2):377-384.(GAO Zheng-guo,DU Yu-long,HUANG Xiao-bo,et al.Mechanical behavior of broken stone fills under dynamic consolidation[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(2):377-384.(in Chinese))
[2]ROLLINS K M,KIM J.Dynamic compaction of collapsible soils based on U.S.case histories[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(9):1178-1186.
[3]姚仰平,张北战.基于体应变的强夯加固范围研究[J].岩土力学,2016(9):2663-2671.(YAO Yang-ping,ZHANGBei-zhan.Reinforcement range of dynamic compaction based on volumetric strain[J].Rock and Soil Mechanics,2016(9):2663-2671.(in Chinese))
[4]吕国仁,崔新壮.旧路改建高速公路中地基强夯效应测试与工艺参数分析[J].岩土力学,2008,29(9):2542-2546.(LüGuo-reng,CUI Xin-zhuang.Measurement of dynamic compaction effect and analysis of technical parameters in reconstruction of old road to expressway[J].Rock and Soil Mechanics,2008,29(9):2542-2546.(in Chinese))
[5]FENG S J,TAN K,SHUI W H,et al.Densification of desert sands by high energy dynamic compaction[J].Engineering Geology,2013,157:48-54.
[6]雷学文,白世伟,孟庆山.强夯引起的振动规律及对建筑物的影响分析[J].建筑技术开发,2002,29(12):20-21.(LEI Xue-wen,BAI Shi-wei,MENG Qing-shan.Analysis on the vibration producedby heavy tamping and its influence on building[J].Building Technique Development,2002,29(12):20-21.(in Chinese))
[7]程祖锋,李萍,谌会芹,等.某港口工程地基处理中的强夯振动效应研究[J].岩土力学,2004,25(5):740-744.(CHENG Zu-feng,LI Ping,CHEN Hui-qin,et al.A study on vibration effect of dynamic compaction in groundwork treatment of a harbor engineering[J].Rock and Soil Mechanics,2004,25(5):740-744.(in Chinese))
[8]HWANG J H,TU T Y.Ground vibration due to dynamic compaction[J].Soil Dynamics&Earthquake Engineering,2006,26(5):337-346.
[9]孙进忠,谭捍华,祁生文,等.强夯振动的频域分析[J].岩土工程学报,2000,22(4):412-415.(SUN Jin-zhoug,TANHan-hua,QI Sheng-wen.Frequency analysis of dynamic compaction vibration[J].Chinese Journal of Geotechnical Engineering,2000,22(4):412-415.(in Chinese))
[10]HWANG J H,TU T Y.Ground vibration due to dynamic compaction[J].Soil Dynamics&Earthquake Engineering,2006,26(5):337-346.
[11]李建华,吕淑然.重锤强夯施工产生的振动规律研究[J].岩石力学与工程学报,2002,21(增刊1):2197-2200.(LIJian-hua,LüShu-ran.Study on vibration resulting from heavy ramming in groundwork construction[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(S1):2197-2200.(in Chinese))
[2]ROLLINS K M,KIM J.Dynamic compaction of collapsible soils based on U.S.case histories[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(9):1178-1186.
[3]姚仰平,张北战.基于体应变的强夯加固范围研究[J].岩土力学,2016(9):2663-2671.(YAO Yang-ping,ZHANGBei-zhan.Reinforcement range of dynamic compaction based on volumetric strain[J].Rock and Soil Mechanics,2016(9):2663-2671.(in Chinese))
[4]吕国仁,崔新壮.旧路改建高速公路中地基强夯效应测试与工艺参数分析[J].岩土力学,2008,29(9):2542-2546.(LüGuo-reng,CUI Xin-zhuang.Measurement of dynamic compaction effect and analysis of technical parameters in reconstruction of old road to expressway[J].Rock and Soil Mechanics,2008,29(9):2542-2546.(in Chinese))
[5]FENG S J,TAN K,SHUI W H,et al.Densification of desert sands by high energy dynamic compaction[J].Engineering Geology,2013,157:48-54.
[6]雷学文,白世伟,孟庆山.强夯引起的振动规律及对建筑物的影响分析[J].建筑技术开发,2002,29(12):20-21.(LEI Xue-wen,BAI Shi-wei,MENG Qing-shan.Analysis on the vibration producedby heavy tamping and its influence on building[J].Building Technique Development,2002,29(12):20-21.(in Chinese))
[7]程祖锋,李萍,谌会芹,等.某港口工程地基处理中的强夯振动效应研究[J].岩土力学,2004,25(5):740-744.(CHENG Zu-feng,LI Ping,CHEN Hui-qin,et al.A study on vibration effect of dynamic compaction in groundwork treatment of a harbor engineering[J].Rock and Soil Mechanics,2004,25(5):740-744.(in Chinese))
[8]HWANG J H,TU T Y.Ground vibration due to dynamic compaction[J].Soil Dynamics&Earthquake Engineering,2006,26(5):337-346.
[9]孙进忠,谭捍华,祁生文,等.强夯振动的频域分析[J].岩土工程学报,2000,22(4):412-415.(SUN Jin-zhoug,TANHan-hua,QI Sheng-wen.Frequency analysis of dynamic compaction vibration[J].Chinese Journal of Geotechnical Engineering,2000,22(4):412-415.(in Chinese))
[10]HWANG J H,TU T Y.Ground vibration due to dynamic compaction[J].Soil Dynamics&Earthquake Engineering,2006,26(5):337-346.
[11]李建华,吕淑然.重锤强夯施工产生的振动规律研究[J].岩石力学与工程学报,2002,21(增刊1):2197-2200.(LIJian-hua,LüShu-ran.Study on vibration resulting from heavy ramming in groundwork construction[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(S1):2197-2200.(in Chinese))