综放窄煤柱巷道稳定性及注浆加固技术研究

发布时间：2018-02-19 17:30

本文关键词： 综放开采窄煤柱支护技术数值模拟　出处：《太原理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：针对煤矿开采技术的不断发展，综合机械化放顶煤开采技术已被广泛应用于煤矿工程实践中。同时为了提高煤炭资源的利用率，回采巷道一侧为开采煤体另一侧多采用窄煤柱布置。窄煤柱的留设一方面可提高资源的采出率，避免造成资源浪费；另一方面却面临在工作面周期来压不断作用下，回采巷道变形明显，支护变得困难。在众多条件下，对于综放工作面窄煤柱回采巷道支护研究就显得十分必要。根据工作面顶板岩层垮落规律和矿压显现规律分析，同时结合实际工作面矿压规律的实测数据，理论计算得出了窄煤柱的尺寸大小，并借助FLAC3D数值模拟技术模拟了不同条件下窄煤柱应力和位移的变化。在确定窄煤柱尺寸大小的基础上，通过分析窄煤柱破碎岩体注浆加固技术，确定注浆加固参数，并最终确定了窄煤柱回采巷道锚注支护方案和参数。本文主要针对三元煤业综放工作面窄煤柱回采巷道技术研究，主要结论如下：（1）通过对工作面上覆岩层的垮落特征分析并结合工作面实际矿压规律的观测得到1308工作面回风顺槽在回采过程中的表面位移、深部位移均控制在合理范围之内，锚—网支护效果较好，可以保证该巷道使用寿命满足开采需求；1308工作面回风顺槽在工作面超前50米范围内变形加速，锚索、锚杆受力较大，应注意加强支护，控制其变形；1308工作面保护煤柱支承压力峰区在6.5m以外，根据巷道煤柱宽度确定要求，可以将煤柱宽度设计在6m以内；沿空掘巷布置工作面回风顺槽时，应加大巷道断面，防止顶板下沉量、两帮移近量过大影响生产；加长锚杆、锚索长度并增加其均匀布置的数量，保证巷道围岩成为一个锚固整体；1310工作面小煤柱宽度应控制在6米的范围以内。（2）通过FLAC3D软件进行数值模拟建立模型，分别模拟了掘进期间和回采期间煤柱围岩屈服破坏特征、小煤柱的应力和位移分布特征，及随工作面向前推进煤柱宽度对巷道围岩位移变化的影响，同时确定了小煤柱的合理宽度为5.0m。（3）对破碎岩体注浆加固机理进行研究得到，注浆加固主要有以下特点：浆液固化网络骨架作用；充填压密提高围岩强度；减少巷道围岩破碎区；注浆固化封闭水源；改善锚杆受力状况。并结合工作面实际地质情况确定了注浆加固参数。（4）经分析计算最终得出了回采巷道支护方案和参数，选用“锚杆+金属网+钢筋梁+锚索补强+注浆加固”的联合支护方案；顶锚杆：锚杆长度2400mm，间排距900m m800mm，锚固长度1200mm，顶锚索：锚索长度8000mm，锚固长度为1800m m，锚索排距2400mm，，帮锚杆：锚杆长度2000mm，锚固长度为600mm。
[Abstract]:According to the continuous development of coal mining technology, comprehensive mechanized coal caving mining technology has been widely used in coal mine engineering practice. At the same time in order to improve the utilization rate of coal resources, coal mining roadway side to the other side of the narrow coal pillar layout. The narrow pillar on the one hand can improve the recovery rate of resources, to avoid waste of resources; on the other hand are in the face of periodic pressure continuously under the action of roadway deformation obviously, supporting difficult. In many conditions, for fully mechanized caving face of narrow coal pillar roadway supporting research is very necessary. According to the working face roof caving rule of law and strata pressure, measured data and combining with the actual working face of mine pressure law, we calculate the theoretical size of narrow coal pillar, and by means of FLAC3D numerical simulation technology to simulate the narrow coal pillar under different conditions should be On the basis of determining the size of narrow coal pillar, through analyzing the grouting reinforcement technology of narrow coal pillar broken rock, the parameters of grouting reinforcement are determined, and finally, the bolting and grouting support scheme and parameters of narrow coal pillar mining roadway are determined finally.
This paper mainly focuses on the technical research of narrow coal pillar mining roadway in three yuan coal caving face. The main conclusions are as follows:
(1) through the analysis of the characteristics of overlying rock caving working face reality and combining with the observation of mine pressure law are 1308 working face return along the groove surface displacement in the process of mining, deep displacement are controlled in a reasonable range, anchor net supporting effect is good, can guarantee the use of roadway to meet the demand of mining life; 1308 working face return roadway in front within 50 meters of deformation acceleration, anchor, anchor force, should pay attention to strengthening the support to control its deformation; 1308 working face protection coal pillar abutment pressure peak area outside of 6.5m, according to the roadway width of coal pillar coal can be determined, column width design within 6m; along goaf working face layout of air trough, should increase the roadway, prevent the subsidence of roof, two sides closer to the large amount of production; the length of the anchor bolt is lengthened, and increase the number of uniform arrangement, guarantee The surrounding rock of the tunnel becomes an anchorage whole, and the width of the small coal pillar in the 1310 working face should be within the range of 6 meters.
(2) to establish model of numerical simulation by FLAC3D software was used to simulate the failure characteristics of yield during the driving period and mining coal pillars surrounding rock stress and displacement distribution of small coal pillar, and the work for the advance effect of coal pillar width on the change of displacement of surrounding rock, and to determine the reasonable width of small coal pillar 5.0m.
(3) to study the reinforcement mechanism of rock grouting get broken, grouting has the following characteristics: solidification network skeleton; filling compaction to improve the rock strength; reduce surrounding rock broken zone; grouting and solidifying closed water; improve the bolt stress condition. And combined with the working face of the actual geological conditions determine the grouting parameters.
(4) through analysis concluded that the roadway support scheme and parameter selection, the supporting scheme of joint bolt + + metal mesh reinforced beam + anchor reinforcement grouting + "; top anchor bolt length 2400mm, spacing 900m m800mm, anchorage length 1200mm, top anchor: anchor cable length 8000mm 1800m m, anchor length, anchor spacing for anchor bolt length: 2400mm, 2000mm, anchorage length is 600mm.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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