›› 2016, Vol. 37 ›› Issue (1): 12-24.doi: 10.16285/j.rsm.2016.01.002

• 基础理论与实验研究 • 上一篇    下一篇

深埋圆形巷道围岩塑性区位移及特征曲线新解和参数分析

张常光1,范 文2,赵均海1   

  1. 1. 长安大学 建筑工程学院,陕西 西安 710061;2. 长安大学 地质工程与测绘学院,陕西 西安 710054
  • 收稿日期:2015-01-11 出版日期:2016-01-11 发布日期:2018-06-09
  • 作者简介:张常光,男,1982年生,博士,副教授,主要从事非饱和土与地下工程等方面的研究工作
  • 基金资助:

    国家自然科学基金项目(No.41202191);中国博士后科学基金项目(No.2014M562358);陕西省自然科学基础研究计划项目(No. 2015JM4146);陕西省博士后科研项目

New solutions of rock plastic displacement and ground response curve for a deep circular tunnel and parametric analysis

ZHANG Chang-guang1, FAN Wen2, ZHAO Jun-hai1   

  1. 1. School of Civil Engineering, Chang’an University, Xi’an, Shaanxi 710061, China; 2. School of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, China
  • Received:2015-01-11 Online:2016-01-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41202191), the China Postdoctoral Science Foundation (2014M562358), the Natural Science Foundation for Basic Research of Shaanxi Province (2015JM4146) and the Postdoctoral Research Project of Shaanxi Province.

摘要: 考虑中间主应力、脆性软化、剪胀特性、塑性区弹性模量及弹性应变定义等综合影响,提出深埋圆形巷道弹塑性计算的基本假定,进而建立围岩塑性区位移及特征曲线新解,对其进行可比性分析与比较验证,并详细探讨各因素影响特性。所得围岩塑性区位移及特征曲线新解是不需要借助任何数值算法的理论解析解,具有广泛的适用性和很好的可比性。研究结果表明:巷道结构的强度理论效应即中间主应力影响显著,相应的支护可以减弱或改用轻型支护;不考虑脆性软化或剪胀特性都将低估围岩实际位移,工程设计偏危险;半径相关的塑性区弹性模量得到的围岩变形及特征曲线处于上、下限之间,能体现巷道开挖卸载受扰程度的距离渐进性变化;塑性区弹性应变应优先选用更合理和准确的第三定义,且各因素之间存在相互影响。

关键词: 收敛约束法, 围岩特征曲线, 中间主应力, 脆性软化, 剪胀特性, 塑性区弹性模量, 塑性区弹性应变

Abstract: Taking comprehensive influences of intermediate principal stress, brittle softening, dilation characteristic, Young’s modulus and elastic strains in the plastic zone into account, some basic assumptions are proposed for the elastoplastic calculation of a deep circular tunnel. On the basis of these assumptions, the new solutions of rock plastic displacement and ground response curve are derived; and then feasibility analysis and comparative verification of the new solutions are carried out. Parametric studies are discussed in detail. The rock plastic displacement and ground response curve presented by this study are theoretical analytical solutions without the need for any numerical method and have broad applicability as well as good comparability. It is found that the strength theory effect of a tunnel, i.e. the intermediate principal stress effect, is significant and the corresponding weak support or light support can be used; the ignorance of brittle softening or dilation characteristic will underestimate actual tunnel deformation, and hence less safety in engineering design; the rock deformation and ground response curve according to the radius-dependent Young’s modulus are between the upper and lower bounds, which can reflect gradual change of the tunnel excavation unloading effect with distance; the third definition for elastic strains in the plastic zone is preferred for its reasonability and precision, and there are interactions between different factors.

Key words: convergence-confinement method, ground response curve, intermediate principal stress, brittle softening, dilation characteristic, Young’s modulus in the plastic zone, elastic strains in the plastic zone

中图分类号: 

  • TU 452

[1] 王凤云, 钱德玲, . 基于统一强度理论深埋圆形隧道围岩的剪胀分析[J]. 岩土力学, 2019, 40(5): 1966-1976.
[2] 梅诗明, 胡小川, 苏国, 陈冠言, . 中间主应力对隧洞岩爆影响的模型试验研究[J]. 岩土力学, 2019, 40(10): 3959-3968.
[3] 吕彩忠,孙亚丽. 软岩洞室最优支护的广义SMP准则解与对比研究[J]. , 2016, 37(7): 1956-1962.
[4] 王国安 ,马林建 ,刘新宇 ,易其康 ,高 磊,. 考虑中间主应力Hoek-Brown强度准则及其适用性[J]. , 2015, 36(8): 2291-2297.
[5] 李 艳 ,赵均海 ,张常光,. 非饱和土条形地基太沙基极限承载力三剪统一解[J]. , 2015, 36(11): 3128-3134.
[6] 张家铭 ,胡明鉴 ,侯国强 ,张表志 ,陈拥军 . 基于大型直剪试验的强风化粗粒料剪胀特性试验研究[J]. , 2013, 34(S2): 67-73.
[7] 夏才初 ,黄继辉 ,卞跃威 ,唐志成 . 融化作用下多年冻土隧道围岩的弹塑性解及其与支护的相互作用分析[J]. , 2013, 34(7): 1987-1994.
[8] 曾开华1,鞠海燕1,张常光2. 深埋圆形隧道弹塑性位移统一解及其比较分析[J]. , 2011, 32(5): 1315-1319.
[9] 隋凤涛,王士杰. 统一强度理论在地基承载力确定中的应用研究[J]. , 2011, 32(10): 3038-3042.
[10] 石 露,李小春. 真三轴试验中的端部摩擦效应分析[J]. , 2009, 30(4): 1159-1164.
[11] 马 青,赵均海,魏雪英. 基于统一强度理论的巷道围岩抗力系数研究[J]. , 2009, 30(11): 3393-3398.
[12] 张传庆,冯夏庭,周 辉,黄书岭. 应力释放法在隧洞开挖模拟中若干问题的研究[J]. , 2008, 29(5): 1174-1180.
[13] 石 寒. 修正的莫尔-库仑理论的解析和验证[J]. , 2007, 28(7): 1491-1494.
[14] 汪鹏程,刘干斌,朱向荣. 弹塑脆性岩土材料中柱形孔扩张大应变解[J]. , 2007, 28(3): 587-592.
[15] 范 文 ,白晓宇 ,俞茂宏,. 基于统一强度理论的地基极限承载力公式[J]. , 2005, 26(10): 1617-1622.
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