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针对构造应力场中巷道围岩变形破坏基本特征,采用FLAC3D数值计算软件,依次分析侧压系数、内摩擦角、黏聚力对矩形巷道周边应力分布、位移和塑性区扩展的影响。结果表明:侧压系数对巷道围岩变形破坏具有敏感性,随着侧压系数的增大,巷道两帮移近量呈现正比增加的趋势且明显大于顶底移近量;内摩擦角在一定的取值范围内,与巷道围岩塑性区变化存在着负相关性,但是当其增大到相对的临界点(30°≤φ≤35°)时,塑性区的变化将不再明显;当黏聚力增大到一定程度(C=5.0MPa)时,巷道围岩塑性区的变化将保持在一个相对稳定的水平。在此基础上提出高强让压支护的基本思路,开发了“多孔循环注浆,深浅孔结合”工艺,在工程实践中取得较好效果。
Aiming at the basic characteristics of surrounding rock deformation and damage in tectonic stress field, the influence of lateral pressure coefficient, internal friction angle and cohesion on the stress distribution, displacement and plastic zone expansion around rectangular roadway were analyzed in turn using FLAC3D software. The results show that the lateral pressure coefficient is sensitive to the deformation and failure of the surrounding rock of the roadway. With the increase of the lateral pressure coefficient, the two approaches of the roadway tend to increase in a proportional manner and are obviously larger than the top and bottom approaches; , But negatively correlated with the change of plastic zone in surrounding rock of roadway, but the change of plastic zone will no longer be obvious when it increases to the relative critical point (30 ° ≤φ≤35 °) Cohesion increases to a certain extent (C = 5.0MPa), the plastic zone surrounding rock changes will remain at a relatively stable level. On the basis of this, the author put forward the basic idea of high strength and pressure support and developed the technology of “multi-hole circulation grouting, combination of deep and shallow holes”, which achieved good results in engineering practice.