通过对采空区抽放瓦斯试验进行分析，找出了试验失败的原因。
Having analysed the "test on the gas drainage under suction in goaf", the failure cause has been found.
采用高位钻孔和仰角钻孔抽放瓦斯技术，有效地防止了瓦斯超限。
High position bores and elevation bores methane drainage technique can prevent gas problem successfully.
因此，煤层气开发应充分研究和借鉴抽放瓦斯的原理和实践经验。
Therefore, the development of coal-bed gas should be studied according to the principle of gas drainage and its practice.
文中结合煤矿抽放瓦斯实践，列举和分析了几种可行的煤层气开发方式。
So several development modes of coalbed gas available are listed and analyzed in this paper.
定向钻进技术已经成为煤矿井下抽放瓦斯长钻孔施工成套技术的关键环节。
Directional drilling technique has already become a key link in long broach construction for gas drainage of the mine.
介绍23702工作面利用高位巷道抽放瓦斯解决上隅角瓦斯的一种方法。
It introduced one method of extracting the gas in 23702 working surfaces through elevated lanes to solve the gas problem in upper corners.
我国煤矿抽放瓦斯已有50多年历史，从技术到规模均达到世界先进水平。
There has already been a history of more than 50 years of gas drainage in our country, which has reached the advanced international standards from technology to the scale.
钻机的研制成功为煤矿实施长距离钻孔抽放瓦斯工艺提供了可靠的安全装备。
The successful development of this drilling machine provided reliable safety equipment for coal mines to practise gas drainage technology by long holes.
在瓦斯涌出较小的采煤工作面，在不必钻孔抽放瓦斯的前提下，有一定的应用性。
In the low gas face, under the premise of drainage gas with drilling holes, it has established utility to use upper goaf drainage with decompression in self coal seam.
变形值可以作为预测煤体突出危险性的一项指标，并可用于预测抽放瓦斯措施的效果。
The deformation value of coal body can be served as a criterion for predicting the risk of coal outburst, as well as an assessment of the effect of degassing measures in coal seams.
在本煤层抽放瓦斯工程中，有效半径和钻孔间距是合理布置抽放钻孔的两个主要参数。
The effective radius and rational distances between bores of drainage gas in coal seams are two of the fundamental parameters of the rational arrangement bores in the engineering of drainage gas.
我国许多煤矿的煤层同时具有高瓦斯和严重自燃倾向，在抽放瓦斯的同时，容易造成采空区遗煤自燃。
There exist high gas and serious spontaneous combustion tendency at the same time in many coal mines in china. When the gas is pumped, it is easy to cause the spontaneous combustion of residual coal.
针对煤层钻孔抽放瓦斯后煤层孔隙裂隙发育致使瓦斯浓度下降，钻孔有效抽放期缩短的技术难题，首次提出二次封孔方法。
Gas concentrations drop, and the effective gas drainage period of holes is shortened, because pores and cracks in the coal seam become completely developed after gas drainage.
通风系统建模与瓦斯抽放系统相互相成。
Ventilation modeling goes hand in hand with gas drainage strategies.
采用优化后的方法可以提高瓦斯抽放效果，减少钻孔数量从而节省施工投入。
It can improve gas suction effect, reduce drilling hole amount and save construction investment.
顶板瓦斯高抽巷的抽采效果与抽放负压直接相关。
The gas extraction effects is related to negative pressure of suction.
实践表明，地面钻井对抽放采动区域瓦斯效果较好。
Practice indicated that the surface boreholes have better effect on gas drainage from mining area.
因此，解决低渗透煤层的瓦斯抽放已成为确保煤矿安全生产，提高煤矿生产效率的关键环节。
So it become the key link solving the gas extraction in low-permeability coal beds to insure in coal mine security and enhance production efficiency.
根据渗流理论，本文对沿层抽放钻孔周围的瓦斯渗流问题进行了电模拟实验研究。
According to seepage theory, the gas seepage from drainage hole along coal seam is studied by means of electrical simulation experiment.
本文从数值模拟的角度提出了建立井下瓦斯抽放数值模型的初步方案，即将边界条件等效和模拟时间前推。
The author makes the proposal of establishing a preliminary underground gas drainage numerical model, which is the equivalent of boundary conditions and shift forward of initial conditions.
以工程实验为基础，结合屯兰矿现有瓦斯抽放中封孔工艺，主要针对封孔长度，通过理论分析，确定合理的封孔长度。
Based on engineering experience and combined with presently hole-sealed technology of gas drainage used in Tunlan mine, the reasonable hole-sealed length was determined by theoretical analysis.
煤矿采动影响区是地面煤层气开发或井下瓦斯抽放的有利部位。
Infection zones of coal mining are favorable place to coalbed methane recovery in ground or gas extraction in underground.
解决低透气性煤层瓦斯抽放问题的根本途径是增加煤层的透气性。
Essential way of solving the gas drainage problem of low permeability coal seam is to increase coal seam permeability.
前言：通过对“三软”不稳定煤层采煤工作面瓦斯来源的分析，介绍了采用顶板岩石钻孔抽放解决瓦斯问题的原理和方法。
Based on the analysis of gas source at the working face with "three-soft" unsteady coal seam, the authors introduce the principle and method of gas suction by roof-rock drilling.
目前国内外煤层气地面开采技术、井下瓦斯抽放技术均已成熟，四川煤层气开发利用是可行的。
At present, the technique of coal-bed methane surface mine and gas drainage was mature, so it was feasible for coal-bed methane development and utilization in Sichuan Province.
在对采空区瓦斯流动规律分析研究的基础上，提出了采空区瓦斯抽放的设想，为采空区瓦斯抽放提出了新的理论依据。
Based on the analysis of the gas migration law, it has proposed an idea of "gas drainage under suction in goaf" so as to provide some new theoretical basis for the performance.
目前，我国的煤矿瓦斯防治技术主要为通风、抽放等物理方法，该类方法仍不能完全满足防治煤矿瓦斯灾害的安全要求。
At present, the main technologies for controlling coal gas are physical methods such as ventilation and exhaustion; however, these methods could not fully meet the safety requirements.
目前，本煤层瓦斯预抽放措施仍然被认为是预防瓦斯灾害最有效的方法之一。
It is considered that the gas pre-extraction measure in coal bed is one of the most effective methods to prevent the gas disaster.
本论文主要是针对远程下保护层开采条件下，对底抽巷上向穿层钻孔抽放远程卸压瓦斯技术进行了深入的研究。
This paper mainly researches on the technique of draining long distance pressure relief gas in bed plate tunnel under the circumstance of mining protective coal seam.
本论文主要是针对远程下保护层开采条件下，对底抽巷上向穿层钻孔抽放远程卸压瓦斯技术进行了深入的研究。
This paper mainly researches on the technique of draining long distance pressure relief gas in bed plate tunnel under the circumstance of mining protective coal seam.
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