岩体特性对围岩与结构动力相互作用影响
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摘要
通过研究岩石特性,进一步对围岩与结构动力耦合机理进行分析。爆炸荷载原型实验研究困难较大,因此应用ANSYS/LS-DYNA非线性显式动力有限元程序和流固耦合计算方法,对垂直爆炸不同岩石类别、不同跨度地下拱形结构进行数值模拟,得到了岩石类别对于不同跨度结构影响的不同规律。研究表明:岩石硬度越大,拱顶动力相互作用显著增大,远距离爆炸对大跨硬岩结构拱肩和拱脚产生明显的反复拉压作用;岩石越软,跨度越小,近距离爆炸对整个结构动力相互作用影响越大。
The study of the dynamic interaction between adjoining rock and structure is important to decide the load of underground structure scientifically and to analyze the dynamic stability of adjoining rock.The rock characteristics are important factors.And it is difficult to study through prototype test because the blast loading is a destructive load.The nonlinear dynamic finite element procedure of ANSYS/LS-DYNA is applied and the fluid-solid coupling algorithm is selected to study with different spans and the detonating distances constantly changing.The result shows that the mechanics status of big-span is completely changed compared with that of the structure of small-span.And different laws of rock types for structures with different spans are obtained.The study shows that dynamic interaction is remarkable between large span structure and surrounding rock of remote explosion.
The study of the dynamic interaction between adjoining rock and structure is important to decide the load of underground structure scientifically and to analyze the dynamic stability of adjoining rock.The rock characteristics are important factors.And it is difficult to study through prototype test because the blast loading is a destructive load.The nonlinear dynamic finite element procedure of ANSYS/LS-DYNA is applied and the fluid-solid coupling algorithm is selected to study with different spans and the detonating distances constantly changing.The result shows that the mechanics status of big-span is completely changed compared with that of the structure of small-span.And different laws of rock types for structures with different spans are obtained.The study shows that dynamic interaction is remarkable between large span structure and surrounding rock of remote explosion.
引文
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[2]Giltner S G.Response of rock to intense dynamic stresses[C]//4th international symposium.Vienna:Rock fragmentation by blasting,1993:545-352.
[3]方秦.爆炸荷载作用下钢筋混凝土结构的动态响应与破坏模式的数值分析[J].工程力学,2007(12):135-144.FANG Qin.Numerical investigation for dynamic response and failure modes of RC structure to blast loading[J].Engineering mechanics,2007(12):135-144.(in Chinese)
[4]曹志远,张耀勤.计入结构-介质动力相互作用的地下结构抗爆计算[J].爆炸与冲击,1985,5(1):16-23.CAO Zhiyuan,ZHANG Yaoqin.The semi-analytical element method for dynamic interaction problems in buried structures[J].China civil engineering journal,1986,19(3):11-26.(in Chinese)
[5]曹志远,曾三平.爆炸波作用下地下防护结构与围岩的非线性动力相互作用分析[J].爆炸与冲击,2003,23(5):385-390.CAO Zhiyuan,ZENG Sanping.Nonlinear dynamic interaction between underground structure and surrounding medium under blast loading[J].Explosion and shock waves,2003,23(5):385-390.(in Chinese)
[6]房营光,孙钧.在冲击波下非线性岩土与圆柱结构的相互作用[J].地震工程与工程振动,1992,12(3):55-64FANG Yingguang,SUN Jun.Interaction between nonlinear soil and cylindrical structure due to shock wave[J].Earthquake engineering and engineering vibration,1992,12(3):55-64.(in Chinese)
[7]房营光,孙钧.冲击环境下非线性岩土与相邻多个结构的相互作用[J].地震工程与工程振动,1993,13(2):38-46.FANG Yingguang,SUN Jun.Interaction between nonlinear geo-medium and multiple structures due to shock wave[J].Earthquake engineering and engineering vibration,1993,13(2):38-46.(in Chinese)
[8]LS-DINA.Keyword user’s manua[S].2003.
[9]孙惠香,许金余.爆炸作用下围岩与地下结构的动力相互作用[J].爆炸与冲击,2013,33(5):519-524.SUN Huixiang,XU Jinyu.Dynamic interaction study between adjoining rock and underground structure subjected to blast loading[J].China civil engineering journal,2013,33(5):519-524.(in Chinese)
[10]康婷,白应生.水平弹性支撑圆拱的动力特性研究[J].力学与实践,2013,35(2):50-55.KANG Ting,BAI Yingsheng.Studying on the dynamic characteristics of the horizontal elastic support circular arch[J].Mechanics in engineering,2013,35(2):50-55.(in Chinese)
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