锚杆参数对锚固边坡抗震性能影响研究
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摘要
分析了锚固边坡锚杆与岩土体在动力荷载下的黏结机制,提出了一种简化的锚杆岩土体相互作用的动力学模型,推导了锚杆岩土体系统的动力响应解析解。结合该简化的锚杆岩土体动力学模型,借助ANSYS有限元程序建立锚固边坡数值模型,分析了在地震荷载作用下,锚杆参数(弹性模量、横截面积、长度、间距)变化对锚固边坡抗震性能(位移、加速度、应力)的影响。分析结果表明:锚杆参数对锚固边坡抗震性能影响强弱不一,增大横截面积可以有效提高边坡抗震稳定性,减小间距也可以改善边坡抗震性能;而弹性模量和长度对边坡抗震性能提高不大,甚至还会起反作用。这些结论对于锚固边坡的抗震设计有一定的借鉴作用。
Firstly,it is analyzed bond mechanism between anchor and soil in anchor slope under dynamic loads;then a simplified dynamic model of interaction between anchor and soil is proposed;and a dynamic responses analytical solution to anchor and soil system is deduced.According to this simplified dynamic model of anchor and soil,a numerical model of anchor slope is established by ANSYS program.And the effects of anchor parameters,such as elasticity modulus,cross-section area,length,space on seismic performances,such as displacement,acceleration,stress of anchor slope under the effect of seismic load are analyzed.Analysis results indicate that the anchor parameters have different effects on seismic performance of anchor slope.Increasing anchor cross section area is able to improve seismic stability of slope effectively;and decreasing anchor space is also beneficial for improving seismic performance of anchor slope;while changing elasticity modulus and cross section area have little effect on enhancing seismic performance of slope,instead increasing elasticity will play negative role for improving seismic performance of anchor slope.These conclusions may provide some references for anchor slope seismic design.
Firstly,it is analyzed bond mechanism between anchor and soil in anchor slope under dynamic loads;then a simplified dynamic model of interaction between anchor and soil is proposed;and a dynamic responses analytical solution to anchor and soil system is deduced.According to this simplified dynamic model of anchor and soil,a numerical model of anchor slope is established by ANSYS program.And the effects of anchor parameters,such as elasticity modulus,cross-section area,length,space on seismic performances,such as displacement,acceleration,stress of anchor slope under the effect of seismic load are analyzed.Analysis results indicate that the anchor parameters have different effects on seismic performance of anchor slope.Increasing anchor cross section area is able to improve seismic stability of slope effectively;and decreasing anchor space is also beneficial for improving seismic performance of anchor slope;while changing elasticity modulus and cross section area have little effect on enhancing seismic performance of slope,instead increasing elasticity will play negative role for improving seismic performance of anchor slope.These conclusions may provide some references for anchor slope seismic design.
引文
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[15]邓东平,李亮,罗伟.地震荷载作用下土钉支护边坡稳定性拟静力分析[J].岩土力学,2012,33(6):17871794.DENG Dong-ping,LI Liang,LUO Wei.Stability analysis of slope protected by soil nailing under earthquake loads based on pseudo static method[J].Rock and Soil Mechanics,2012,33(6):1787-1794.
[16]徐晓核.锚杆锚固系统低应变纵向动力响应规律的研究[D].重庆:重庆大学,2005.
[17]中国建筑科学研究院.建筑抗震设计规范GB50011—2010[S].北京:中国建筑出版社,2010.
[2]SHILPA PAL,AMIR M KAYNIA,RAJINDER K BHASIN,et al.Earthquake stability analysis of rock slopes:A case study[J].Rock Mechanics and Rock Engineering,2011,45(2):205-215.
[3]GALI MADHAVI LATHA,ARUNAKUMARI GARAGA.Seismic stability analysis of a Himalayan rock slope[J].Rock Mechanics and Rock Engineering,2010,43(6):831-843.
[4]CHEN XIAOLI,KATO NOBUAKI,TSUNAKI RYOSUKE,et al.Prediction of slope failure due to earthquake[J].Chinese Science Bulletin,2009,54(16):2888-2894.
[5]KOYAMA TOMOFUMI,AKAO SATOSHI,NIHIYAMA SATOSHI,et al.Earthquake response analysis for rock slope using discontonuous deformation analysis(DDA)[J].Japan Science and Technology Information Aggregator Electronics,2009,65(3):644-662.
[6]OKAMURA YOSHIYUKI,SAKO KAZUNARI,FUKAGAWA RYOICHI.Analysis of seismic displacements of slopes applied vibratory conveyance theory[J].Japan Science and Technology Information Aggregator Electronics,2009,65(1):162-173.
[7]WANG ZONGJIAN,ARAI KATSUHIKO,TATTA NAOKI,et al.Model test and numerical analysis of slope stability during earthquake[J].Japan Science and Technology Information Aggregator Electronics,2007,63(10):363-374.
[8]ZHENG WENBO,ZHUANG XIAOYING,CAI YONGCHANG.On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables[J].Frontiers of Structural and Civil Engineering,2012,6(2):132-146.
[9]郑文博,庄晓莹,蔡永昌,等.地震作用下预应力锚索对岩石边坡稳定性影响的模拟方法及锚索优化研究[J].岩土工程学报,2012,34(9):1668-1676.ZHENG Wen-bo,ZHUANG Xiao-ying,CAI Yong-chang,et al.Modeling of prestressed anchors in rock slope under e a r t h q u a k e a n d o p t i m i z a t i o n o f a n c h o r a r rangement[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1668-1676.
[10]ZHAO TI,SUN JINZHONG,ZHANG BIN,et al.Analysis of slope stability with dynamic overloading from earthquake[J].Journal of Earth Science,2011,23(3):285-296.
[11]叶海林,郑颖人,陆新,等.边坡锚杆地震动特性的振动台试验研究[J].土木工程学报,2011,44(增刊1):152-176.YE Hai-lin,ZHENG Ying-ren,LU Xin,et al.Shaking table test on anchor bars of slope under earthquake[J].China Civil Engineering Journal,2011,44(Supp.l):152-176
[12]叶海林,郑颖人,李安洪,等,地震作用下边坡预应力锚索振动台试验研究[J].岩石力学与工程学报,2012,31(增刊1):2847-2854 YE Hai-lin,ZHENG Ying-ren,LI An-hong,et al.Shaking table test studies of prestressed anchor cable of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(Supp.1):28472854.
[13]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379 YE Hai-lin,HUANG Run-qiu,ZHENG Ying-ren,et al.Sensitivity analysis of parameters for bolts in rock slopes under earthquakes[J].Chinese Journal of Geotechnical Engineering,2010,32(9):1374-1379.下转第493页
[14]刘建华,汪优,付康林,等.简谐振动荷载下锚杆加固岩质边坡的受力分析[J].岩土力学,2012,33(增刊1):85-90.LIU Jian-hua,WANG You,FU Kang-lin,et al.Force analysis of anchor bolts reinforcing rock slope under simple harmonic vibration load[J].Rock and Soil Mechanics,2012,33(Supp.1):85-90.
[15]邓东平,李亮,罗伟.地震荷载作用下土钉支护边坡稳定性拟静力分析[J].岩土力学,2012,33(6):17871794.DENG Dong-ping,LI Liang,LUO Wei.Stability analysis of slope protected by soil nailing under earthquake loads based on pseudo static method[J].Rock and Soil Mechanics,2012,33(6):1787-1794.
[16]徐晓核.锚杆锚固系统低应变纵向动力响应规律的研究[D].重庆:重庆大学,2005.
[17]中国建筑科学研究院.建筑抗震设计规范GB50011—2010[S].北京:中国建筑出版社,2010.
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