土压实度的瞬态冲击法测试
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摘要
为寻找一种无损、快速和准确地检测土压实度的新方法,基于振动能量在土壤中衰减的基本原理,使用重锤冲击压实度不同、含水质量分数不同的土壤,在与冲击点一定距离处的土壤中测取振动响应信号,并对测取的信号在时域和频域上进行分析。试验结果表明:在测试距离一定、含水质量分数相同时,在同一脉冲宽度内振动加速度信号的幅值、有效值均随压实度的增加而增大;在最佳含水质量分数附近的范围内,土壤中含水质量分数对压实度计算结果的影响不大,误差小于1%;在冲击距离为200~400 mm时的测量和计算结果,比较接近真实测量值,距离较近、较远时误差均较大。
Based on the attenuation principle of the vibration in soil,a nondestructive,quick and accurate way of testing soil's compaction is put forward.A serious of hammer blow experiments are conducted on different compactness and water content of soil,and the vibration acceleration are obtained at certain distances.According to time-domain analysis and frequency-domain analysis of the measured experiment data,the results shows that: the amplitude and effective value of vibration acceleration increase with the soil compaction when the distance of measuring points and water content of soil is constant;when water content is near the optimal water content,it has a little influence on the soil compaction,the measuring error is below 1%;the measuring value is closer to the real soil compaction when the distance from measuring point to vibration point is 200~400 mm;but when the distance is longer or shorter than 200~400 mm,the measuring error is bigger.4 tabs,1 fig,13 refs.
Based on the attenuation principle of the vibration in soil,a nondestructive,quick and accurate way of testing soil's compaction is put forward.A serious of hammer blow experiments are conducted on different compactness and water content of soil,and the vibration acceleration are obtained at certain distances.According to time-domain analysis and frequency-domain analysis of the measured experiment data,the results shows that: the amplitude and effective value of vibration acceleration increase with the soil compaction when the distance of measuring points and water content of soil is constant;when water content is near the optimal water content,it has a little influence on the soil compaction,the measuring error is below 1%;the measuring value is closer to the real soil compaction when the distance from measuring point to vibration point is 200~400 mm;but when the distance is longer or shorter than 200~400 mm,the measuring error is bigger.4 tabs,1 fig,13 refs.
引文
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[2]李国文.进一步完善路用核子密实度仪性能的探讨[J].湖南交通科技,1997,23(3):30-32.LI Guo-wen.A study on the betterment of highwaynucleon compactedness detectors[J].HunanCommunications Science and Technology Journal,1997,23(3):30-32.
[3]靳建明.土压实度瞬态振动测试的分析方法研究[D].杭州:浙江大学,2004.
[4]王红举.道路压实与质量的控制[J].筑路机械与施工机械化,2006,23(4),52-53.WANG Hong-ju.Road compaction and qualitycontrol[J].Road Machinery&ConstructionMechanization,2006,23(4):52-53.
[5]卜发东.软土地区土压实度瞬态锤击测试及分析方法研究[D].杭州:浙江大学,2001.
[6]胡红梅,徐刚,盛安连.快速测量路基压实度的技术研究[J].江苏大学学报:自然科学版,2003,15(3):84-87.HU Hong-mei,XU Gang,SHENG An-lian.Newmethod for measuring degree of subgrade compactionquickly[J].Journal of Jiangsu University:NaturalScience Edition,2003,15(3):84-87.
[7]路晶,郭涛.宝马振动压路机智能压实控制系统[J].筑路机械与施工机械化,2006,23(7):51-53.LU Jing,GUO Tao.Intelligent compacting controlsystem for BOMAG vibrating compactor[J].RoadMachinery&Construction Mechanization,2006,23(7):51-53.
[8]Erbach D C,Kinney G R,Wilcox A P,et al.Straingage to measure soil compaction[J].Transactions ofthe ASAE,1991,(6):2 345-2 348.
[9]郭学彬,肖正学.论爆破地震波在传播过程中的衰减特性[J].中国矿业,2006,21(3):51-53.GUO Xue-bin,XIAO Zheng-xue.On attenuatingcharacteristic of blasting seismic waves in propagatingprocess[J].China Mining Magazine,2006,21(3):51-53.
[10]孙业志,吴爱祥,李建华,等.振动场中散体介质波的传播规律[J].矿冶工程,2001,14(2):12-14.SUN Ye-zhi,WU Ai-xiang,LI Jian-hua,et al.Characters of wave propagation in granular media[J].Mining and Metallurgical Engineering,2001,14(2):12-14.
[11]张志峰,冯忠绪,刘本学.振动压路机对建筑物的振动影响及控制对策[J].长安大学学报:自然科学版,2007,27(1):88-91.ZHANG Zhi-feng,FENG Zhong-xu,LIU Ben-xue.Vibration effects of vibratory roller on nearbybuildings and its control measures[J].Journal ofChang’an University:Natural Science Edition,2007,27(1):88-91.
[12]郝飞,张志峰,何成建,等.振动压实引起环境振动的测试研究[J].筑路机械与施工机械化,2006,23(10):57-59.HAO Fei,ZHANG Zhi-feng.HE Cheng-jian,et al.Study of environmental vibration from vibratingcompaction[J].Road Machinery&ConstructionMechanization,2006,23(10):57-59.
[13]Cattaneo P W.Optimal measurement of signal overnoise ratio with constrained filter transfer functions[J].Nuclear Instruments and Methods in PhysicsResearch,2002,(2-3):726-728.
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