铁路瓦斯隧道分类及煤与瓦斯突出预测方法研究

发布时间：2018-06-03 04:51

  本文选题：瓦斯隧道 + 等级划分　； 参考：《西南交通大学》2015年硕士论文

【摘要】：目前,我国西南地区的穿煤瓦斯隧道建设量逐渐增多,新建隧道较多为双线高速客专的大断面隧道,极大地提高加了工程建设难度。但是我国的《铁路瓦斯隧道技术规范》(TB10120-2002)规定的瓦斯隧道分类方法比较单一,没有考虑到隧道断面大小的影响,条文说明的解释也比较模糊。而且煤与瓦斯突出预测等揭煤防突技术基本上都是从煤矿部门直接引入或稍作改进后直接应用,常规预测方法费时费力,而且有些指标测定的精确度不高。鉴于此,对瓦斯隧道分类和煤与瓦斯突出技术的研究很有必要。在国内外研究的基础上,本文开展的主要研究以及所取得的成果如下：(1)根据国内外对瓦斯隧道的研究和瓦斯隧道施工经验,通过分析瓦斯浓度、隧道通风和隧道断面面积等主要影响因素,提出了适合于各种常见断面的瓦斯隧道分类方法。(2)铁路瓦斯隧道类别按照隧道工区最高界别划定。对于Ⅰ类断面隧道(40～80m2),微瓦斯与低瓦斯隧道工区的分界值为0.1m3/min,低瓦斯与高瓦斯隧道工区的分界值为0.7m3/min；对于Ⅱ类断面隧道(80-120m2)的分类界限值分别为0.3m3/min和1.4m3/min；对于Ⅲ类断面隧道(120-160m2)的分类界限值分别为0.5m3/min和2.1m3/min;对于Ⅳ类断面隧道(160m2)的分类界限值分别为0.7 m3/min和2.8m3/min；其中只要工区内有一处具有突出危险则该工区就判定为煤与瓦斯突出工区。(3)根据煤与瓦斯突出综合作用机理,选取了瓦斯压力、地质构造、煤体结构类型、煤体坚固系数、瓦斯放散初速度和隧道穿煤段垂直埋深6个影响因素建立了一个BP神经网络预测模型(6个输入节点,11个隐层节点,2个输出节点)。并用25组国内典型煤层突出样本对网络进行训练学习,用国内已建的10座瓦斯隧道进行判定验证,正确率达到90%,仅有一座无突出危险的隧道验证为具有突出危险。(4)用已训练好的网络对成贵线玉京山隧道、高坡隧道和观音山隧道进行突出预测,结果显示玉京山隧道和观音山隧道无突出危险,而高坡隧道具有一定的煤与瓦斯突出危险。这个预测结果可作为设计施工时的一个参考,实际结果还需要实际施工验证。
[Abstract]:At present, the construction quantity of coal and gas tunnel in southwest China is increasing gradually, and the newly built tunnels are mostly large section tunnels with double lines and high speed, which greatly increases the difficulty of engineering construction. However, the classification method of gas tunnel stipulated by TB10120-2002 in our country is relatively simple, which does not take into account the influence of tunnel section size, and the interpretation of the provisions is rather vague. In addition, coal and gas outburst prediction and other uncovering coal outburst prevention techniques are all introduced directly from the coal mine departments or applied directly after a slight improvement. The conventional prediction methods are time-consuming and laborious, and the accuracy of some indexes is not high. In view of this, it is necessary to study the classification of gas tunnel and the technology of coal and gas outburst. Based on the research at home and abroad, the main research and the results obtained in this paper are as follows: 1) according to the domestic and foreign research on gas tunnel and the construction experience of gas tunnel, through the analysis of gas concentration, The main influencing factors, such as tunnel ventilation and tunnel cross-section area, are put forward. The classification method of gas tunnel suitable for various common sections is put forward. 2) the category of railway gas tunnel is delimited according to the highest subsector of tunnel working area. For type I cross-section tunnel, the boundary value is 0.1m3 / min for micro-gas and low-gas tunnel, 0.7m3 / min for low-gas and high-gas tunnel, and 0.3m3/min and 1.4m3 / min for type 鈪，

本文编号：1971534