• (1)2008-2021年连续14年获得中国科技核心期刊
  • (2)2021年被中国科学院文献情报中心中国科学引文数据库CSCD(核心库)收录(2021-2022)
  • (3)热烈庆祝《水资源与水工程学报》入编北京大学图书馆《中文核心期刊要目总览》2020年版
惠 强, 姜海波, 张玉洁, 翟栋森.考虑渗流及软化效应的深埋引水隧洞围岩弹塑性分析水资源与水工程学报[J].,2021,32(3):210-218
考虑渗流及软化效应的深埋引水隧洞围岩弹塑性分析
Elastoplastic analysis of the surrounding rock of deep buried diversion tunnels considering seepage and softening effect
  
DOI:10.11705/j.issn.1672-643X.2021.03.29
中文关键词:  圆形引水隧洞  统一强度理论  渗流  应变软化  弹塑性解
英文关键词:circular diversion tunnel  unified strength theory  seepage  strain softening  elastoplastic solution
基金项目:国家自然科学基金项目(51769031);石河子大学青年创新人才培育计划(CXRC201804)
作者单位
惠 强, 姜海波, 张玉洁, 翟栋森 (石河子大学 水利建筑工程学院 新疆 石河子 832003) 
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中文摘要:
      为研究圆形引水隧洞围岩的塑性区及应力分布情况,应用弹塑性力学,考虑渗流及应变软化的影响,采用统一强度准则,推导了圆形隧洞围岩各分区应力场以及塑性区半径的解析解,结合工程算例分析,得到围岩软化、渗流作用、中间主应力系数对隧洞切向应力和塑性区半径的影响规律,同时通过定义不均匀渗透系数,分析了不同方向上孔隙水压力分布规律。研究结果表明:随着不均匀渗透系数的改变,渗流沿不同方向表现出了各向异性,且越靠近水平方向或垂直方向,孔隙水压力分布受不均匀渗透系数的影响越明显;渗流及材料软化对围岩应力场分布以及塑性区大小均有不同程度的影响,材料软化较渗流影响对围岩稳定更为不利;中间主应力系数对围岩切向应力及塑性区范围有着显著的影响,不考虑中间主应力效应时计算结果相对保守,不能有效发挥出围岩的强度。研究结论可为研究含水岩体下隧洞开挖围岩稳定性等问题提供理论参考。
英文摘要:
      In order to study the plastic zone and stress distribution of the surrounding rock of circular diversion tunnels, we deduced the analytical solutions of stress field of each zone and the radius of the plastic zone based on elastoplastic mechanics and the unified strength criterion, considering the influence of seepage and strain softening. With the analysis of an actual engineering project, we discussed the influences of the softening of the surrounding rock, seepage and central principal stress coefficient on the tangential stress and plastic zone radius of the tunnel. At the same time, the distribution law of pore water pressure in different directions was analyzed by defining the non-uniform permeability coefficient.The results show that with the change of the non-uniform permeability coefficient, the seepage shows the tendency of anisotropy in different directions, and the closer it gets to the horizontal or vertical direction, the more easily the distribution of pore water pressure is affected by the non-uniform permeability coefficient. The seepage and material softening have different effects on the stress field distribution and plastic zone size of the surrounding rock, and the latter has a more adverse effect on the stability of the surrounding rock. The central principal stress coefficient has a significant influence on the tangential stress and plastic zone of the surrounding rock. Without taking into account the effect of the central principal stress, the calculated results would be relatively small, resulting in the inadequate application of the surrounding rock strength. The conclusion can provide a theoretical reference for the study of the surrounding rock stability during the excavation of tunnels under water-bearing rock masses.
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