基于四阶段模型的深埋硐室围岩分区受力分析
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U451.2

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国家自然科学基金资助项目(51178336)第一作者孙卫星(1989-),男,汉族,本科学历,从事隧道工程研究。E-mail342802674@qq.com。通讯作者周 建(1992-),男,汉族,博士研究生,从事地下工程理论方面研究。E-mail:1982426967@qq.com。 考虑支护时机的深埋硐室围岩分区受力分析


Zonal disintegration force analysis about surrounding soft rock of chamber considering by considering supporting opportunity
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    摘要:

    为研究硐室开挖过程中选择支护时机的力学机理,首先,建立圆形硐室分区受力模型,基于Mohr-Coulomb屈服准则,考虑围岩扩容、软化等岩体特性以及“空间效应”,推导出开挖过程中硐室围岩弹塑性解;然后,选择锚杆、衬砌支护时机,考虑锚杆与围岩的耦合作用和初衬混凝土的时效特性,得到支护条件下围岩的弹塑性解;最后,结合算例分析了“空间效应”、支护时机等因素对硐室围岩塑性区应力、位移 和范围的影响。基于理论研究的算例分析,揭示了考虑“空间效应”和支护时机时硐室各分区范围的变化规律;锚杆间排距对围岩位移的控制主要体现在残余区;硬化区扩容系数、开挖过程中的“空间效应”和支护时机对控制围岩位移的作用不容忽视。该文成果为深埋软岩硐室开挖与支护设计提供一定的理论依据。

    Abstract:

    In order to study circular chamber excavation and supporting process of soft rock mechanical mechanism, the model of soft chamber was established firstly. Based on Mohr-Coulomb yield criterion,rock mass characteristics such as rock dilatancy 、softening and so on and were considered. Therefore, chamber rock elastic-plastic solutions in excavation process was deduced. Secondly, based on homogenization method under the condition of bolts and liners supporting, considering the coupling effect between anchor and surrounding rock and the aging characteristics of primary lining concrete, rock elastic-plastic solution under supporting condition was obtained. Lastly, an example was analyzed to study the effect of different factors such as , supporting opportunity and so on to stress of plastic zone、surrounding displacement and plastic zone radius of chamber. Based on theoretical research case, the change rule of considering the "space effect" and the supporting opportunity when calculating the subarea of the chamber, the control of interval distance of rock bolts on the displacement of surrounding rock mainly reflecting in the residual area, the role of dilatancy factor in the hardened area, the "spatial effect" in excavation and the support time to control the displacement of surrounding rock can not being ignored are revealed. The results of this paper provide a certain theoretical foundation to process of deep-buried soft rock chamber excavation and supporting.

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孙卫星,赵永宾,周建,等. 基于四阶段模型的深埋硐室围岩分区受力分析[J]. 科学技术与工程, 2021, 21(36): 15631-15638.
Sun Weixing, Zhao Yongbin, Zhou Jian, et al. Zonal disintegration force analysis about surrounding soft rock of chamber considering by considering supporting opportunity[J]. Science Technology and Engineering,2021,21(36):15631-15638.

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  • 收稿日期:2021-04-19
  • 最后修改日期:2021-09-26
  • 录用日期:2021-08-26
  • 在线发布日期: 2022-01-04
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