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现代隧道技术 2020, Vol. 57 Issue (1) :44-50    DOI:
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软岩大变形条件下围岩变形与围岩压力的关系研究
(1西南交通大学地球科学与环境工程学院,成都 611756;2四川建筑职业技术学院铁道工程系,成都 610399)
On Relationship between Surrounding Rock Deformation and Surrounding Rock Pressure under Large Deformation of Soft Rock
(1 Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756; 2 Department of Railway Engineering, Sichuan College of Architecture Technology, Chengdu 610399)
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摘要 为获得软岩大变形条件下围岩变形与围岩压力之间的关系,为大变形让压设计提供依据,文章利用FLAC3D数值模拟软件,计算了某单线铁路隧道开挖后在无支护条件下洞周发生不同变形量后施作弹性支护结构的最大压应力,并以此间接反映围岩压力,得到围岩压力随围岩变形的释放关系曲线。将类似工程实例的监测数据与该关系曲线进行对比分析,结果表明:围岩压力随围岩变形的释放关系曲线分为陡降区、调整区和缓降区三部分;软岩大变形可分为收敛型和非收敛型两类,收敛型大变形隧道将可量测的洞周变形控制在15 cm(洞周半径的3%)以内是经济合理的,且施作常规系统锚杆效果最好;非收敛型大变形隧道可量测的洞周变形量超过63 cm(洞周半径的14%)时,围岩压力释放效果才进一步提高;通过大幅的洞周变形来减小围岩压力时,将导致塑性区的大幅增加,此时的系统锚杆作用微乎其微。
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马时强 1
2
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Abstract: In order to understand the relationship between the deformation of surrounding rocks and the surround? ing rock pressure under large deformation of soft rock to provide basis for yielding design of large deformation, the maximum compressive stress of the elastic supporting structure after some deformations of a single-track railway tunnel without support is calculated by FLAC3D numerical simulation software, the surrounding rock pressure is identified indirectly, and the curve of surrounding rock pressures varying with time is obtained. The monitoring data of some similar projects are compared with this relationship curve, and the results show that: the pressure release curve is divided into three parts, i.e. steep drop area, adjustment area and slow dropping area; the large deformation of soft rock can be divided into convergence type and non-convergence type, it is economical and reasonable if the measur? able peripheral deformations can be controlled within 15 cm (3% of tunnel radius) in condition of convergence, and the best effect can be obtained by installing conventional systematic anchor bolts; the pressure release effect of surrounding rocks will be improved further when the measurable peripheral deformation is more than 63 cm(14% of tunnel radius)in condition of non-convergence; it will result in large increase of plastic zone if the pressures of surrounding rocks are reduced by large peripheral deformations, and the systematic anchor bolts play little role at this time.
KeywordsSoft rock tunnel,   Large deformation,   Surrounding rock pressure,   Surrounding rock deformation,   System? atic anchor bolts;Reserved deformation     
基金资助:基金项目:四川建筑职业技术学院院级科研专项资金(20140114).
作者简介: 作者简介:马时强(1982-),男,博士研究生,高级工程师,讲师,主要从事软岩隧道施工及岩土工程研究工作,E-mail:msqswfc99@163.com
引用本文:   
马时强 1, 2 .软岩大变形条件下围岩变形与围岩压力的关系研究[J]  现代隧道技术, 2020,V57(1): 44-50
MA Shiqiang1, 2 .On Relationship between Surrounding Rock Deformation and Surrounding Rock Pressure under Large Deformation of Soft Rock[J]  MODERN TUNNELLING TECHNOLOGY, 2020,V57(1): 44-50
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