深部矿井箕斗装载硐室的围岩稳定性分析和支护设计优化

发布时间：2018-05-24 11:45

本文选题：箕斗装载硐室 + 围岩稳定性　；参考：《安徽理工大学》2015年硕士论文

【摘要】：随着人类对矿产需求量的不断增加,煤炭的开采强度和深度在不断扩大,进而煤矿箕斗装载硐室的设计规模也在变大,对位于深部的断面大的、结构复杂的装载硐室支护变得更加困难。因此,研究深部矿井大型箕斗装载硐室的围岩稳定性,提出箕斗装载硐室支护优化方案,确保煤矿生产安全,有着十分重要的意义。论文对围岩的稳定性影响因素以及硐室围岩的的变形与破坏进行了分析；研究了影响硐室围岩稳定性因素,硐室围岩变形破坏的具体表现形式,阐述了硐室的开挖方法和支护技术。针对潘三矿深部矿井装载硐室埋深大,断面尺寸大,围岩条件差等特点,对其支护结构进行了优化,减小了锚杆、锚索的间排距,并补打了锚索,与原支护结构计算结果进行了对比分析,结果表明：采用优化方案的支护结构应力和围岩变形均明显小于原设计方案的结构应力和围岩变形,且能够满足硐室围岩受力及变形要求,使得支护体受力得到较为明显的改善,具有一定的安全储备；其次,为研究箕斗装载硐室曲墙四心圆和直墙半圆拱这两种支护结构的的差异性,采用FLAC3D数值模拟软件对两种支护结构作了对比分析,发现当遇到大断面的的箕斗装载硐室,并且地压较大、围岩较差的时候,曲墙四心圆支护结构更有优势,能发挥更大的作用。最后对风井箕斗装载硐室的支护结构进行了实时监测,监测结果表明：支护结构钢筋应力、混凝土应变趋于稳定,并且小于设计值,由此可见优化后的支护结构处于安全状态,可为类似结构的支护设计提供参
[Abstract]:With the increasing human demand for mineral resources, the mining intensity and depth of coal are expanding, and the design scale of the coal skip loading chamber is also becoming larger, and the section located in the deep section is large. The complex structure of loading chamber support becomes more difficult. Therefore, it is of great significance to study the stability of surrounding rock of large skip loading chamber in deep mine, to put forward the optimized support scheme of skip loading chamber and to ensure the safety of coal mine production. This paper analyzes the factors affecting the stability of surrounding rock and the deformation and failure of surrounding rock of chamber, studies the factors affecting the stability of surrounding rock of chamber and the concrete manifestation of deformation and failure of surrounding rock of chamber. The excavation method and supporting technology of chamber are expounded. In view of the characteristics of large depth of loading chamber, large cross section size and poor surrounding rock condition of deep mine loading chamber in Panshan No. 3 Mine, the supporting structure is optimized to reduce the spacing between anchors and cables, and to make up for the anchoring cables. Compared with the calculation results of the original support structure, the results show that the stress of the supporting structure and the deformation of the surrounding rock in the optimized scheme are obviously smaller than the structural stress and the deformation of the surrounding rock in the original design scheme. And can meet the chamber surrounding rock force and deformation requirements, so that the force of the support body has been significantly improved, with a certain amount of safety reserves; secondly, In order to study the difference between the four center and half circular arch support structures of skip loading chamber, the FLAC3D numerical simulation software is used to compare the two support structures, and it is found that when the skip loading chamber with large section is encountered, And when the ground pressure is large and the surrounding rock is poor, the four-center circular support structure of curved wall has more advantages and can play a greater role. The monitoring results show that the reinforcement stress and concrete strain of the supporting structure tend to be stable and smaller than the design value, which shows that the optimized support structure is in a safe state. It can provide reference for the support design of similar structure.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD354

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