基于锚固串群体结构的顶板支护设计

Surrounding Rock Control of Deep Roadway Based on Anchorage Group Structure

针对破碎顶板稳定性差,变形量大,支护设计不合理等问题,基于数值模拟提出锚固串群体结构,分析了锚固串群体结构及其力学机制,通过建立锚固串群体结构力学平面模型,得到相邻锚固串锚固厚度计算公式.为了研究锚固串群体结构不同锚固厚度的支护效果,设计了4种不同锚固串群体结构.本文以矩形巷道为例,由4种不同锚固串群体结构设计了1200,1000,800,600 mm等4种不同锚杆间距的支护方案.通过数值模拟和支护成本的综合分析,得出最优支护方案为间距800 mm,进一步得到部分相交的锚固串群体结构是最合理结构这一结论.锚杆支护设计应根据具体巷道地质特征和现场生产条件,确定部分相交的锚固串群体结构参数.

Aiming at the problems of poor stability,large deformation and unreasonable support design of broken roof,the anchorage string group structure is proposed based on numerical simulation,and the anchorage string group structure and its mechanical mechanism are analyzed.By establishing the mechanical plane model of anchorage string group structure,the calculation formula of anchorage thickness of adjacent anchorage string is obtained.In order to study the supporting effect of different anchorage thickness of anchorage string group structure,four different anchorage string group structures are designed.In this paper,taking the rectangular tunnel as an example,four support schemes with different bolt spacing of 1200 mm,1000 mm,800 mm and 600 mm are designed,corresponding to four different anchor string structures.Through the comprehensive analysis of numerical simulation and support cost,it is concluded that the spacing of 800 mm is the optimal support scheme,and the group structure of partially intersecting anchor strings is the most reasonable structure.At the same time,the design of bolt support should be based on the specific geological characteristics of the roadway and the site production conditions to determine a reasonable group structure of anchor string.