10kV XLPE电缆击穿振动在砂土中的传播规律
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摘要
通过模型试验研究了直埋式10 k V XLPE电缆击穿振动在砂土中的传播衰减特性,分别用指数衰减、负乘幂衰减公式对试验数据进行拟合,并验证公式的合理性.结果表明:指数衰减、负乘幂衰减公式均可用于描述电缆击穿振动在砂土中的传播衰减特性,相关系数均在0.97以上;振动波在近处衰减快,远处衰减慢;砂土的指数衰减系数为0.0704、乘幂衰减系数为1.3494.
This paper deals with the propagation attenuation behaviors of the breakdown vibration of the directburied 10 k V XLPE cable in sand by means of the model experiment. The experimental data are fitted respectively by using the exponential decay formula and the negative power attenuation formula,and the reasonableness of the formulas is verified. The results show that( 1) both the exponential decay formula and the negative power attenuation formula can be used to describe the propagation attenuation behaviors of the cable breakdown vibration in sand,and their correlation coefficients are both more than 0. 97;( 2) the vibration wave attenuates quickly in the vicinity and slowly in the distance; and( 3) the exponential decay coefficient and the power attenuation coefficient of sand are respectively 0. 070 4 and 1. 349 4.
This paper deals with the propagation attenuation behaviors of the breakdown vibration of the directburied 10 k V XLPE cable in sand by means of the model experiment. The experimental data are fitted respectively by using the exponential decay formula and the negative power attenuation formula,and the reasonableness of the formulas is verified. The results show that( 1) both the exponential decay formula and the negative power attenuation formula can be used to describe the propagation attenuation behaviors of the cable breakdown vibration in sand,and their correlation coefficients are both more than 0. 97;( 2) the vibration wave attenuates quickly in the vicinity and slowly in the distance; and( 3) the exponential decay coefficient and the power attenuation coefficient of sand are respectively 0. 070 4 and 1. 349 4.
引文
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[16]张宇,吴宗宇,林霞.隧洞开挖爆破振动对地面建筑的影响分析[J].水利规划与设计,2014(2):58-60,73-76.Zhang Yu,Wu Zong-yu,Lin Xia.Tunnel excavation blasting vibration analysis of buildings on the ground[J].Water Resources Planning and Design,2014(2):58-60,73-76.
[2]LSTC.LS-DYNA keyword user's manual[M].Livermore,California:Livermore Software Technology Corporation,2003:128-129.
[3]Wood R D.Screening of surface waves in soils[J].Journal of the Soil Mechanics and Foundations Div-isions,ASCE,1994(4):951-979.
[4]唐海,李海波.反映高程放大效应的爆破振动公式研究[J].岩土力学,2011,32(3):820-824.Tang Hai,Li Hai-bo.Study of blasting vibration formula of reflecting amplification effect on elevation[J].Rock and Soil Mechanics,2011,32(3):820-824.
[5]蒋楠,周传波,平雯,等.岩质边坡爆破振动速度高程效应[J].中南大学学报:自然科学版,2014,45(1):237-243.Jiang Nan,Zhou Zhuan-bo,Ping Wen,et al.Rock slope blasting vibration velocity altitude effect[J].Central South University:Natural Science,2014,45(1):237-243.
[6]杭的平,韩云山.强夯振动影响的研究[J].岩土工程与地下工程,2014,34(1):71-72.Hang De-ping,Han Yun-shan.Compaction vibration effects[J].Geotechnical and Underground Engineering,2014,34(1):71-72.
[7]夏祥,李俊如,李海波,等.爆破荷载作用下岩体振动特征的数值模拟[J].岩土力学,2005,26(1):50-56.Xia Xiang,Li Jun-ru,Li Hai-bo,et al.Numerical characteristics of the rock mass under blasting vibration load simulation[J].Rock and Soil Mechanics,2005,26(1):50-56.
[8]刘美山,吴从清,张正宇.小湾水电站高边坡爆破震动安全判据试验研究[J].长江科学院院报,2007,24(1):40-43.Liu Mei-shan,Wu Cong-qing,Zhang Zheng-yu.Experimentation on judging standard of blasting vibration safety in high slope excavation of Xiaowan hydropower station[J].Journal of Yangtze River Scientific Research Institute,2007,24(1):40-43.
[9]Havenith H B,Vanini M,Jongmans D.Initiation of earthquake-induced slope failure:influence of topographical and other site specific amplification effects[J].Journal of Seismology,2003,7(3):397-412.
[10]周明.料场开挖爆破岩质边坡振动速度高差放大效应研究[J].水利规划与设计,2014(2):73-76.Zhou Ming.Stockyard rock slope excavation blasting vibration velocity elevation amplification effect study[J].Water Resources Planning and Design,2014(2):73-76.
[11]叶洲元,周志华.爆破震动安全距离的优化计算[J].中国安全科学学报,2005,15(3):57-60.Ye Zhou-yuan,Zhou Zhi-hua.Optimization of blasting vibration safety distance calculation[J].China Safety Science Journal,2005,15(3):57-60.
[12]蒋维强,欧阳立胜.强夯地震效应特征研究[J].防灾减灾工程学报,2005,25(1):45-48.Jiang Wei-qiang,Ouyang Li-sheng.Study ofearthquake effect of dynamic compaction[J].Journal of Disaster Prevention and Mitigation Engineering,2005,25(1):45-48.
[13]谭捍华.强夯地面振动的分析与评价[D].北京:中国地质大学土工程学院,1999.
[14]Song Xiao-lin,Zhang Ji-chun,Guo Xue-bin,et al.Influence of blasting on the properties of weak intercalation of a layered rock slope[J].International Journal of Minerals,Metallurgy and Materials,2009,16(1):7-11.
[15]向国威,叶冠林,王建华.冲击振动在砂土中传播的模型试验研究[J].上海交通大学学报,2012,46(1):136-141.Xiang Guo-wei,Ye Guan-lin,Wang Jian-hua.Experimental research model vibration transmission in sand[J].Journal of Shanghai Jiaotong University,2012,46(1):136-141.
[16]张宇,吴宗宇,林霞.隧洞开挖爆破振动对地面建筑的影响分析[J].水利规划与设计,2014(2):58-60,73-76.Zhang Yu,Wu Zong-yu,Lin Xia.Tunnel excavation blasting vibration analysis of buildings on the ground[J].Water Resources Planning and Design,2014(2):58-60,73-76.
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