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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (S2): 48-58.DOI: 10.3973/j.issn.2096-4498.2023.S2.005

• 研究与探索 • 上一篇    下一篇

考虑冻融循环效应的非静水压寒区隧道应力场弹性分析

杨自友, 高鹏*, 尚阳光, 张煜   

  1. (安徽建筑大学土木工程学院, 安徽 合肥 230601
  • 出版日期:2023-12-30 发布日期:2024-03-27
  • 作者简介:杨自友(1975—),男,安徽霍山人,2008年毕业于中国科学技术大学,工程安全与防护技术专业,博士,教授,主要从事矿业工程及岩土工程研究。 E-mail: zyyang75@mail.ustc.edu.cn。 *通信作者: 高鹏, E-mail: 914821422@qq.com。

Elastic Analysis of Tunnel Stress Field in Cold Zone Under Non-Hydrostatic Pressure Considering Freeze Thaw Cycle Effect

YANG Ziyou, GAO Peng*, SHANG Yangguang, ZHANG Yu   

  1. School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China
  • Online:2023-12-30 Published:2024-03-27

摘要: 为综合研究冻融循环和非静水压力共同作用下寒区隧道应力分布的规律,考虑寒区隧道冻结围岩的不均匀冻胀特性和冻融循环对围岩力学性能的影响,基于复变函数方法,建立非静水压力作用下寒区隧道冻融圈整体冻胀模型,推导非静水压力作用下寒区隧道应力的弹性解答,对所得解进行对比验证和参数分析,讨论冻融循环次数、不均匀冻胀系数、侧压力系数、冻胀率等因素对寒区隧道应力的影响规律。结果表明: 1)冻胀力随冻融循环次数、不均匀冻胀系数的增加分别增大了89%26.7%2)侧压力系数λ对冻胀力有着显著影响,当λ≥1时,冻胀力随方位角的增大而增加;当λ<1时,冻胀力随方位角的增加而减小。34种体积冻胀率参数中对冻胀力影响最大的是水热迁移系数,可使冻胀力增大36.4%。

关键词: 寒区隧道, 冻融循环, 不均匀冻胀, 侧压力系数, 复变函数

Abstract:  To comprehensively investigate the stress distribution patterns of tunnels in cold zone under the joint action of freezethaw cycle and nonhydrostatic pressure, an overall frost heave model of freezethaw cycle of tunnels in cold zone under nonhydrostatic pressure is established based on compound function considering the inhomogeneous frostheave characteristics of the frozen surrounding rocks of the tunnels in cold zone and the influence of freezethaw cycle on the mechanical properties of the surrounding rocks. Then the elastic solution of the stress of the tunnels in cold zone under the action of nonhydrostatic pressure is deduced, and a comparative validation and parametric analysis are conducted on the obtained solution. Finally, the influence of the number of freezethaw cycles, inhomogeneous frostheave coefficient, lateral pressure coefficient, freezing and expansion rate on the stress of tunnels in the cold zone is discussed. The results reveal the following: 1 The frostheave force increases by 89% and 26.7% with increasing number of freezethaw cycles and inhomogeneous frostheave coefficient, respectively. 2 The lateral pressure coefficient WT〗λ 〖WT5《TNR》〗has a considerable impact on the frostheave force,the frostheave force increases and decreases with increasing azimuthal angle when WT〗λ〖WT5《TNR》〗≥1 and WT〗λ〖WT5《TNR》〗<1, respectively. 3 The hydrothermal migration coefficient considerably affects the frostheave force rather than other three volumetric freezing and expansion rate parameters, which can increase the frostheave force by 36.4%.

Key words: tunnels in cold zone, freezethaw cycle, uneven frost heave, lateral pressure coefficient, compound function