基于锚杆受力分析的深埋洞室围岩分区破裂演化规律研究

doi:10.13722/j.cnki.jrme.2017.1594

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摘要合理确定深埋洞室围岩破裂区厚度及数量可以为洞室开挖及支护提供重要的理论依据。根据围岩分区破裂条件下锚杆拉–压交替分布的受力变形特点，提出一种通过锚杆受力规律反演分析围岩分区破裂的新方法：基于杆体与围岩的协调变形原理，建立全长锚固锚杆与围岩相互作用的力学模型，推导锚杆中性点沿杆体分布位置及其最大轴力的理论公式，分析各分区范围内围岩的破裂区与非破裂区厚度；基于格里菲斯强度理论，提出围岩应力重分布后弹塑性界面岩体发生拉裂的力学判据，进而确定围岩的破裂区数量。结果表明：洞室开挖后围岩应力发生重分布，当弹塑性界面上的岩体在最大切向支撑压力下所产生的拉伸应力超过其极限抗拉强度时，岩体将产生径向拉裂并出现多个破裂区和非破裂区交替分布现象；破裂区和非破裂区内岩体位移速率的差异将导致锚杆沿长度方向出现多个中性点；基于各中性点半径反演分析得到的围岩破裂区厚度大致呈依次递减的趋势，直至围岩破裂停止。最后，运用实例计算结果对上述认识进行验证，研究成果对深埋洞室开挖及围岩支护具有重要参考价值。

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	于远祥
	陈宝平
	王赋宇
	王京滨
	柯达

关键词 ：岩石力学, 深埋洞室, 全长锚固, 分区破裂, 反演分析, 演化规律

Abstract：Determining the thickness and number of fractured zones in surrounding rock is important for excavation and supporting of cave at deep underground. A new approach to analyze the zonal disintegration of surrounding rock was put forward according to the periodical characteristic of tension-compression stress along the bolt length. A mechanical model of interaction between the full-size grouted bolt and surrounding rock was established based on deformation compatibility. The neutral point on the bolt and the formulas of maximum axial force were deduced. The range of plastic area in every zone in the surrounding rock was analyzed. The mechanical criterion about the tensile rupture of the surrounding rock on elastic-plastic interface after stress redistribution was proposed based on the Griffith?s strength theory. Then，the number of fractured zones in the surrounding rock was determined. The results show that the stress of the surrounding rock is redistributed after excavation. Under the condition of the maximum circumferential stress，radial tensile rupture happens on the elastic-plastic interface of surrounding rock when the tensile stress is greater than its ultimate tensile strength and the multiple fractured zones and non-fractured zones occur alternately. The displacement rate of rock within the fractured zone is different from that of non-fractured zone along the radial direction，leading to multiple neutral points along the bolt length. The thickness of the fracture zones in surrounding rock based on the back analysis of the radius of each neutral point shows a decreasing trend on the whole until the rupture of the surrounding rock stops. Finally，the above results were confirmed in a real engineering project.

Key words： rock mechanics deep underground cave full grouted bolt zonal disintegration back analysis evolution law

引用本文:

于远祥，陈宝平，王赋宇，王京滨，柯达. 基于锚杆受力分析的深埋洞室围岩分区破裂演化规律研究[J]. 岩石力学与工程学报, 2018, 37(7): 1629-1640.
YU Yuanxiang，CHEN Baoping，WANG Fuyu，WANG Jingbin，KE Da. Zonal disintegration of surrounding rock in deep underground cave based on force analysis of rock bolts. , 2018, 37(7): 1629-1640.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1594 或 http://www.rockmech.org/CN/Y2018/V37/I7/1629

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