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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2022, Vol. 41 ›› Issue (02): 95-101.DOI: 10.3969/j.issn.1674-0696.2022.02.14

• 交通基础设施工程 • 上一篇    下一篇

多因素影响下水工隧洞最小覆盖层厚度力学分析

杨自友，程长清，孙天宇，俞凡，杨明   

  1. (安徽建筑大学 土木工程学院，安徽 合肥 230601)
  • 收稿日期:2020-04-03 修回日期:2020-12-06 发布日期:2022-02-21
  • 作者简介:杨自友（1975—），男，安徽霍山人，教授，博士，主要从事岩土工程方面的研究。E-mail:zyyang75@mail.ustc.edu.cn 通信作者：程长清（1989—），男，安徽天长人，硕士，主要从事地下结构与强度理论方面的研究。E-mail:646309877@qq.com
  • 基金资助:
    国家自然科学基金项目(51774007)；安徽省高校自然科学研究重点项目（KJ2021A0610）

Mechanical Analysis of Minimum Overburden Thickness of Hydraulic Tunnel under Multiple Factors

YANG Ziyou, CHENG Changqing, SUN Tianyu, YU Fan, YANG Ming   

  1. (School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China)
  • Received:2020-04-03 Revised:2020-12-06 Published:2022-02-21

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摘要： 综合考虑中间主应力系数n、渗流体积力pw及剪胀系数β等的影响，采用统一强度理论和D-P准则，根据应力、位移连续性条件，计算得到了圆形水工隧洞径向应力σr、环向应力σθ的解析解；推导出隧洞围岩塑性区半径r和最小覆盖层厚度h；分析了渗透系数比kd/kc、剪胀系数β、岩体强度参数c、φ及中间主应力系数n对最小覆盖层厚度h的影响。结果表明：当kd/kc≤500时，h值相对较小，当kd/kc＞500时，h值趋于一定值；不考虑渗流时，h值增大约94%；c、φ值对h值影响较明显；采用统一强度理论计算，h值随着n的增大而增大，采用D-P准则计算，h值则出现波动，呈现中间主应力的区间性；采用两种理论计算的h值均随着β的增大而增大。

关键词: 隧道工程；岩土工程；渗流；剪胀系数；中间主应力

Abstract: Considering the influence of intermediate principal stress coefficient n, seepage body force pw and dilatancy coefficient β, the analytical solutions of radial stress σr and circumferential stress σθ of circular hydraulic tunnel were obtained by unified strength theory and D-P criterion according to the continuous conditions of stress and displacement. The plastic zone radius r and the minimum overburden thickness h of tunnel surrounding rock were deduced. And the influences of permeability coefficient kd/kc, dilatancy coefficient β, rock strength parameters c and φ，and intermediate principal stress coefficient n on the minimum overburden thickness h were analyzed. The results show that when kd/kc is equal or less than 500, h is small; when kd/kc is greater than 500, h tends to be a certain value; and when the seepage is not considered, h is increased by about 94%. The c and φ value have obvious influence on h. Using the unified strength theory, h increases with the increase of n, while using the D-P criterion, h fluctuates, showing the interval of intermediate principal stress. The minimum overburden thickness h calculated by the two kinds of strength criteria increases with the increase of dilatancy coefficient β.

Key words: tunnel engineering; geotechnical engineering; seepage; dilatancy coefficient; intermediate principal stress

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