加固工程中准低级岩爆机理的塑性分析研究
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摘要
基于塑性理论的岩爆机理分析揭示柱表面混凝土块体崩裂时的塑性变形增量典型特征与工程实际相符,理论上揭示剪破面剪力超限是低级岩爆发生的机理。提出卸围压属塑性力学意义上的加载过程,这一加载过程在瞬间完成,是引起准岩爆的导因,利用Coulomb剪破条件及Tresca流动法则导出产生低级岩爆判据。根据工程典型数据计算的临界第三主压应力与岩爆其他强度判据计算的结果较接近,且具有计算方便、适于工程技术人员应用的特点。
Rock burst mechanism analysis based on plastic theory reveals that the typical characteristics of the plastic deformation increment when the concrete block on the pillar surface cracks is consistent with the engineering reality,which theoretically reveals that the over-limit shearing force on the shearing surface is the essential mechanism of lower rock burst. This paper proposes that unloading confining pressure is an instantaneous loading process in plastic mechanics. The loading process is completed in an instant,which causes quasi rock burst,the criterion for lower rock burst by means of Coulomb shearing condition and Tresca flow rule, and points out that the critical third principal compressive stress calculated according to typical engineering data is similar to other strength criteria of rock burst. It has a convenient calculation,application characteristics,which is suitable for engineering and technical people.
Rock burst mechanism analysis based on plastic theory reveals that the typical characteristics of the plastic deformation increment when the concrete block on the pillar surface cracks is consistent with the engineering reality,which theoretically reveals that the over-limit shearing force on the shearing surface is the essential mechanism of lower rock burst. This paper proposes that unloading confining pressure is an instantaneous loading process in plastic mechanics. The loading process is completed in an instant,which causes quasi rock burst,the criterion for lower rock burst by means of Coulomb shearing condition and Tresca flow rule, and points out that the critical third principal compressive stress calculated according to typical engineering data is similar to other strength criteria of rock burst. It has a convenient calculation,application characteristics,which is suitable for engineering and technical people.
引文
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[2]谷明成,何发亮,陈成宗.秦岭隧道岩爆的研究[J].岩石力学与工程学报,2002(9):1324-1329.
[3]王仁,黄文彬.塑性力学引论[M].北京:北京大学出版社,1982,
[4]庄懋年,马晓士,蒋潞.工程塑性力学[M].北京:高等教育出版社,1983.
[5]张镜剑,傅冰骏.岩爆及其判据和防治[J].岩石力学与工程学报,2008(10):2034-2042.
[6]陈卫忠,吕森鹏,郭小红,等.脆性岩石卸围压试验与岩爆机理研究[J].岩土工程学报,2010,32(6):963-969.
[7]杜坤.真三轴载下深部岩体破裂特性及诱发型岩爆机理研究[D].长沙:中南大学,2013.
[8]王延可,李天斌,陈国庆,等.岩爆特性PFC~(3D)数值模拟试验研究[J].现代隧道技术,2013,50(4):98-103.
[9]滕伟福,胡新丽,唐辉明.岩石全应力-应变试验与岩爆理论研究[J].岩土力学,2002,23(S1):59-61.
[10]谢仁海,渠天祥,钱光谟.构造地质学[M].北京:中国矿业大学出版社,2007.
[11]GIWELLI A A,SAKAGUCHI K,GUMATI A,et al.Shear behaviour of fractured rock as a function of size and shear displacement[J].Geomechanics and geoengineering,2014,9(4).
[12]徐林生,王兰生.岩爆形成机理研究[J].重庆大学学报(自然科学版),2001(2):115-117,121.
[13]WANG E Y,LIU X F,ZHAO E L,et al.Prediction and control of rock burst of coal seam contacting gas in deep mining[J].Journal of coal science and engineering,2009,15(2):152-156.