the speed of drilling hole

This paper analyses the main factors that influence the speed of drilling hole,puts forward the methods to settle the main working parameters of the rotary drill.

分析了影响牙轮钻机钻孔速度的主要因素,提出了钻机主要工作参数的确定方法。

To improve highway tunnel s rock stability classification,the authors introduced the drilling rock rate as included in the classical surrounding rock stability appraisal system,developed a new classification method based on improved back-propagation ANN and considering drilling rock rate.

为了有效的进行公路隧道围岩稳定性超前分类,将台车钻孔速率引入到围岩稳定性评价指标体系中,通过增加动量因子和设置自适应调整学习率的方法建立了改进型BP神经网络的围岩分类模型。

The main factors affecting the initial speed are studied and the causes of initial speed from borehole gas emission often exceeding limit theoretically explained.

突出煤层卸压后用钻孔瓦斯涌出初速度进行工作面预测和效果检验时经常超过突出临界值,造成开采保护层后煤层突出危险性更大的现象。

This article based on the engineering practice, analyzes five main factors affecting the excessive or insufficient excavation:drill precision, the act of measuring, blasting technology, the geology of wall rock and real - time management, and the .

结合具体工程实践,分析了影响隧道超欠挖产生的五个主要因素,即围岩地质条件、钻孔精度、测量放线、爆破技术和现场管理等,并有针对性地提出了控制隧道超欠挖所应采取的技术措施。

Change Rule of Initial Speed of Gas Emission From Borehole in Outburst Coal Seam Before and After Pressure Relief

突出煤层卸压前后钻孔瓦斯涌出初速度的变化规律

Analysis on Influencing Factors of Gas Emission with Boreholes to Determine Drainage Radius

钻孔瓦斯涌出量确定排放半径影响因素分析

Research on Bit for Efficient Drilling of Gas Drainage Borehole in Nantong Mining Area;

南桐矿区瓦斯抽放孔快速钻进钻头的研究

Study on the Characteristics of Gas Content and Emission Based on the Information of Drilling

基于钻探信息的煤层瓦斯含量及涌出特征研究

Study on Width of Gas Drainage Zone in Coal Roadway Based on Gas Emission

基于瓦斯涌出量的煤巷瓦斯排放带宽度研究

Regulations of Methane Discharge in Coal Laneway with Mechanized Speedy Drivage;

煤巷机械化快速掘进瓦斯涌出规律的探讨

Long Borehole Gas Pre-pumping Applied Research on Thick Coal Seam Groups with Coal and Gas Outburst

长钻孔在煤与瓦斯突出厚煤层群瓦斯预抽中的应用研究

The Theoretic Research of Feasibility of Big Track Boring Used in Coal and Gas Burst Predication;

大直径钻孔预测与瓦斯突出可行性的理论研究

Prediction on Gas Emission and Gas Drainage base on Elevation

根据标高预测瓦斯涌出量和瓦斯抽放

Application of Technology of High Gas Cannon Picking Roof Perforate Gas Administer

高瓦斯炮放面顶板钻孔法瓦斯治理技术应用

Laboratory and Numerical Test Studies of Gas Pre-drainage with Dense Boreholes in Outburst Coal Seam;

突出煤层密集钻孔瓦斯预抽实验室与数值试验研究

The Study of the Prediction of the Amount of the GAS Emission and Its Influencing Factors in Liyazhuang Coal Mine;

李雅庄煤矿瓦斯涌出量预测及瓦斯涌出影响因素的研究

The Law of Gas Emission for the Full-Mechanized Mining Working Face and the Prediction of the Gas Emission Quantity;

综采工作面的瓦斯涌出规律及瓦斯涌出量的预测

Design for drawing out gas with high position boring at coal face

轻放工作面抽放瓦斯高位钻孔的设计

Research on the technology of integrated interchange drilling to drainage gas

综合立体交叉钻孔抽放瓦斯技术研究

Gas Drainage Technology of Goaf with Boreholes from Surface Ground of Tangshan Mine

唐山矿地面钻孔抽放采空区瓦斯技术

Technology of 1000 meter directional borehole at large diameter for mine gas extraction

顶板大直径千米长钻孔抽采瓦斯技术

Probability Study on Gas Pour and Gas Flow Forecast;

矿井瓦斯涌出及瓦斯流动预测的统计研究