锚固体梁刚度变化的影响因素分析

发布时间：2019-03-31 00:44

【摘要】：随着煤矿支护技术的不断完善,无论在类型、支护理论、施工工艺还是锚杆强度方面都比较系统。但目前就锚杆(索)组合梁结构中的刚度问题研究不够深入,因此本文主要就支护后锚固体刚度问题进一步研究。首先,简单概述了国内外锚杆、锚索支护技术的发展概况、锚杆索的分类及特点、锚杆(索)的支护理论。其次,本文主要介绍锚杆索支护后对围岩力学性质的影响和刚度的影响因素(主要从锚杆(索)长度、支护密度、"三径"的配合、锚固长度、锚杆(索)预紧力施加、锚杆与锚索联合支护等五个方面),并进行逐个详细的分析。建立了摩尔-库伦弹塑性材料模型,通过改变锚杆间距、不同的锚杆排距、锚杆长度、支护密度和锚杆(索)联合支护等参数,运用FLAC3D模拟了在不同荷载条件下,模型中心点位移量。分析了不同因素对锚固体刚度的影响。最后,提出一些提高锚固体刚度的措施,包括:选择合理的锚杆(索)布置方式、锚杆(索)联合支护、合理的"三径"匹配、控制预紧力损失等,即在保证锚固体刚度的同时,提出了合理的锚杆(索)布置方式、锚杆(索)长度、锚杆(索)组合方式。为煤矿支护提供了合理的理论参考,可以指导生产实践,取得较好的经济效果和减少工人的工作强度。本文结合新集二矿2611工作面机巷的支护方式和顶板离层监测部分结果,对锚杆、锚杆(索)联合支护后锚固体刚度的影响因素进行研究。
[Abstract]:With the continuous improvement of coal mine supporting technology, it is more systematic in type, supporting theory, construction technology and bolt strength. But at present, the research on the stiffness of anchor (cable) composite beam structure is not deep enough, so this paper mainly studies the rigidity of anchor after supporting. Firstly, the development situation of anchor bolt and anchor cable supporting technology at home and abroad, the classification and characteristics of anchor rod cable, and the supporting theory of anchor rod (cable) are briefly summarized. Secondly, this paper mainly introduces the influence of anchor rod and cable support on the mechanical properties of surrounding rock and the influence factors of stiffness (mainly from the length of bolt (cable), support density, "three diameter" coordination, anchor length, anchor (cable) pre-tightening force applied, Five aspects, such as the combination of anchor bolt and anchor cable, etc.), and the detailed analysis is carried out one by one. The Mohr-Coulomb elasto-plastic material model was established. By changing the parameters such as bolt spacing, different bolt spacing, bolt length, support density and bolt (cable) combined support, FLAC3D was used to simulate under different load conditions. Model center point displacement. The influence of different factors on the stiffness of anchor was analyzed. Finally, some measures to improve the stiffness of anchor are put forward, including selecting reasonable arrangement of anchor rod (cable), combined support of anchor rod (cable), reasonable "three-diameter" matching, controlling the loss of pre-tightening force, and so on. That is to say, the reasonable arrangement of anchor rod (cable), the length of anchor rod (cable) and the combination of anchor rod (cable) are put forward at the same time of ensuring the stiffness of anchor. It provides a reasonable theoretical reference for coal mine support, which can guide production practice, obtain better economic effect and reduce the working intensity of workers. In this paper, combined with the supporting mode of 2611 face in Xinji No. 2 Coal Mine and the monitoring results of roof separation, the influence factors of anchor stiffness after bolting and bolt (cable) combined support are studied in this paper.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD350.4

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