考虑峰后特性的隧道围岩锚固力学效应

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摘要 This work aims to study the mechanical mechanism of the post-peak tunnel surrounding rock state under grouted bolting support. The post-peak surrounding rock, which is under the effect of secondary stress from the free surface to the deep tunnel, can be divided into the residual strength, plastic softening, and elastic deformation zones according to the mechanical characteristic. The bolt axial stress and shear strength equations are obtained based on the principle of bolt bonding resistance to sliding deformation. The supporting force, which is provided by the grouted rock bolt through the rock-anchorage face, is assumed to be equivalent to the radial body force of the surrounding rock. Therefore, the balance equation is established by considering the influence of bolting support. The radii of the post-peak residual and softening zones, as well as the displacement and stress under grouted bolting support, is determined by combining the compatibility equations of the residual and softening plastic zones and considering rock post-peak strain softening and dilatancy with the balance equation. On the basis of theoretical research cases, the reinforcement effects between the grouting anchor and the surrounding rock, as well as bolting pretension, significantly improve the mechanical properties of the softening and dilatancy characteristics and control the development of the regional range and deformation of the surrounding rock.

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	肖旺
	郭全元
	苏永华

关键词 ： tunnel engineering, reinforcement mechanical effects, analytical method, strain softening, soft rock dilatancy, shear stress on interface, preload

Abstract：This work aims to study the mechanical mechanism of the post-peak tunnel surrounding rock state under grouted bolting support. The post-peak surrounding rock, which is under the effect of secondary stress from the free surface to the deep tunnel, can be divided into the residual strength, plastic softening, and elastic deformation zones according to the mechanical characteristic. The bolt axial stress and shear strength equations are obtained based on the principle of bolt bonding resistance to sliding deformation. The supporting force, which is provided by the grouted rock bolt through the rock-anchorage face, is assumed to be equivalent to the radial body force of the surrounding rock. Therefore, the balance equation is established by considering the influence of bolting support. The radii of the post-peak residual and softening zones, as well as the displacement and stress under grouted bolting support, is determined by combining the compatibility equations of the residual and softening plastic zones and considering rock post-peak strain softening and dilatancy with the balance equation. On the basis of theoretical research cases, the reinforcement effects between the grouting anchor and the surrounding rock, as well as bolting pretension, significantly improve the mechanical properties of the softening and dilatancy characteristics and control the development of the regional range and deformation of the surrounding rock.

Key words： tunnel engineering reinforcement mechanical effects analytical method strain softening soft rock dilatancy shear stress on interface preload

收稿日期: 2016-01-30

通讯作者: XIAO Wang,E-mail address:462665311@qq.com E-mail: 462665311@qq.com

引用本文:

肖旺, 郭全元, 苏永华. 考虑峰后特性的隧道围岩锚固力学效应[J]. Journal of Highway and Transportation Research and Development, 2017, 11(1): 49-58.
XIAO Wang, GUO Quan-yuan, SU Yong-hua. Anchorage Mechanical Effects of Tunnel Surrounding Rock by Considering Post-peak Characteristics. Journal of Highway and Transportation Research and Development, 2017, 11(1): 49-58.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/ 或 http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/Y2017/V11/I1/49

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