narrowing是什么意思

网络释义

用法例句

Research on Effect of Rockmass Joints and Fissures on Blasting in Tunneling and Its Practice;

岩体节理裂隙对巷道掘进爆破影响的研究与实践

Development of tunneling blasting expert system;

巷道掘进爆破专家系统研究开发

Application of the technique of pentagon hollow cutting-in in tunneling;

五角空心掏槽技术在巷道掘进中的应用

This paper numerically investigated the basic conditions and possibility of the secondary disaster in the coal mine caused by the mine fire in the laneway.

本文采用数值分析方法研究井下掘进巷道内火灾所导致的继发性灾害发生的条件。

Analysis of attenuation law and characteristic parameters in excavation roadway during gas explosion;

掘进巷道瓦斯爆炸衰减规律及特征参数分析

Dynamic mathematical model and numerical analysis of gas explosion in excavation roadway;

掘进巷道瓦斯爆炸动态数学模型及数值分析

With the combination of the physical model based on excavation roadway during gas explosion,the gaseous phase detonation parameters are deduced on the conditions of the known gas congestion position,volume and concentration.

结合所建立的掘进巷道瓦斯爆炸的物理模型,当已知瓦斯聚积位置、体积和浓度时,利用Hugoniot方程和Rayleigh方程推导出了瓦斯爆轰参数的公式。

The blasting hole arrangement of hard ductility rocks in the roadway excavation is discussed and explosive loading coefficient is determined.

介绍了该矿传统掘进凿岩爆破方法,详细阐述了该矿硬韧性岩的巷道掘进炮眼布设及装药系数的确定。

Study on the roadway excavation rapidly in the low permeability outburst coal seam;

针对在低透气性突出煤层巷道掘进过程中,煤与瓦斯突出综合检测指标经常超限,掘进速度缓慢等问题,提出了深孔预裂控制爆破和巷帮钻孔边抽边掘相结合的综合防突技术,研究了深孔预裂控制爆破技术的作用机理,阐述了深孔预裂控制爆破技术的工艺流程和巷帮钻孔的布置参数。

Study on Intensified Ventilation and Flow Field of Jet Ventilation in Heading Face;

掘进巷道强化通风与射流通风流场的试验研究

Middle-Deep Bore Blasting Experimental Study on Hard Rock Tunnel Heading

硬岩巷道掘进的中深孔爆破试验研究

Technology of Supporting Super High Roadway in Large-height Mining Face

大采高工作面超高巷道掘进支护技术

Practices of Laneway Driving and Supporting in Unstable Terrane

不稳固岩层中的巷道掘进与支护实践

Support Technology of Roadways Driving in Steep Middle Thick Coal Seam

急倾斜、中厚煤层巷道掘进支护技术

Application of FBG Sensors in Laneway Excavation

FBG传感器在巷道掘进中的应用研究

Application of Air-deck Charge for Smooth Blasting in Driving of a Drift

空气间隔装药光面爆破在某巷道掘进中的应用

Comprehensive Technical Study of Driving and Supporting for Drift in Powder Ore Mining

粉矿开采中巷道掘进与支护综合技术的研究

Numerical Simulation Studies on the Effects of Blasting Vibrationof Driving Laneway on the Surrounding Rock

巷道掘进爆破震动对围岩影响的数值模拟研究

The anchor net supporting application in high seam tunneling of Sanyuan coal industry

锚网支护在三元煤业厚煤层巷道掘进中的应用

The kibble hole arrangement optimization of tunnel digging blasting of Daanshan mine

大安山矿巷道掘进爆破掏槽孔布孔优化

The Study of the Celerity Single Tunneling Technique of the Horizontal Tunnel in the Second Shizuishan Mining;

石嘴山二矿水平巷道单巷快速掘进技术研究

Smooth Surface Demolition in Rock Alley Driving the Importance for That Tunnel Becomes Shape

光面爆破在岩巷掘进时对巷道成形的重要性

Outburst Prevention Technology Incoal Exposure in the Driving of the Open Seam Roadway

浅谈掘进穿煤层巷道的揭煤防突技术

Numerical Simulates Studying in roadway construction temperature field simulation

基于CFD技术的掘进巷道温度场模拟

Rapid Tunneling Technology for Semi-coal Rock Tunnel in Sitai Coal Mine

四台矿半煤岩巷道快速掘进工艺技术

To Open Up the Cave Tunnel Boring Cause of the Accident Analysis and Prevention and Control Measures

掘进巷道冒顶事故的原因及防治措施

Study on the maximal driving length of dummy drift in uranium mines

铀矿井独头巷道最大掘进长度的研究

Brief Talks of Enhancing the Speed of Rapid Excavation of Comprehensive Bolting Support Tunnel

提高综掘锚杆支护巷道快速掘进速度的探讨