查询词典 caving

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

分析了放顶煤开采顶煤冒放性的影响因素。

The key of settling the difficulties of supporting and caving is to develop and adopt the new style hydraulic caving supports with tail beam of expansion link combined by above 2 new technologies.

全面解决支护和冒放等难题，关键在于开发和采用由上述两项新技术结合而成的新型放顶煤液压支架－伸缩杆尾梁放顶煤液压支架。

To solve the problems presently such as Herculean rock engineering exists at gob-side entry excavating in comprehensive mechanization caving coalface, difficult drivage and ventilation in single road in crossheading from far distance, this paper studies and puts forward two-roadway layout system with small coal column in thick coal comprehensive mechanization caving coalface.

本文为解决目前综放沿空护巷系统存在的岩石工程量大、顺槽单巷长距离掘进施工及通风困难等问题，提出了厚煤层综放工作面小煤柱护巷双巷布置系统。

Based on the application of systematic reliability and grey system theory and fuzzy mathematics method, the reliability of the man machine environment system of caving fully mechanized face is studied, and the calculating formulas of the effectiveness of extraction system and caving system are also give

综合应用系统可靠性、灰色系统理论和模糊数学方法，研究了放顶煤综采工作面人－机－环境系统可靠性，得到了割煤系统和放煤系统可用度的计算公

Roof control ; Underground continuous mining ; Natural caving property ; Artificially induced caving ; Time sequence system

顶板控制；地下连续开采；自然崩落性；人工诱导崩落；时序系统

A systematic study is made on the underground continuous mining of No.3 thick and low grade orebody of a nonferrous metal mine by a simulation test with similar material and by FLAC-3D method,including the study on the natural roof caving,the time-sequence system of artificially induced roof caving and the roof stress cha...

利用相似材料模拟试验和FLAC-3D研究方法，对某有色金属矿山厚大、低品位的3#矿体的地下连续开采进行了系统研究，包括矿体顶板自然崩落性、顶板人工诱导崩落时序系统以及开采过程中顶板应力变化规律的研究。

The study of impact of dirt band on top coal drawing mining;2. The paper has studied the caving characteristics and technology on the fully-mechanized caving mining working face in structural complex thick seam containing dirt band are studied.

通过对综放工作面含夹矸结构复杂段顶煤放出特征和放煤工艺的研究，提出选择两刀一放单轮间隔放煤方式，有利于提高煤炭回收率，降低原煤含矸率。

By analogue simulating test, the paper discusses fully-mechanized sub-level with dirt band, the top-coal caving and drawing property , the caving procedure and drawing law, and the dirt band critical thickness related to complex structure thickness seam of 2429S.

主要以实验室相似模拟实验为主，对含夹矸复杂结构厚煤层中的2429S综放工作面含夹矸顶煤的冒放性、放煤工艺及放出规律、夹矸层极限厚度的确定等问题进行了论述，并指出了含夹矸顶煤的活动规律和放顶煤开采的技术措施。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

The results show that the variation in elevation angle of roof beam can be controlled by the equilibrium jack in moving support and the stress at different parts can be adjusted according to the variation of the support load in coal caving process, greatly improving the adaptability of the 2-leg shield support in top-coal caving working face.

分析结果表明，通过平衡千斤顶可以控制移架过程中顶梁仰角的变化，并可调节支架各部位受力以适应放煤过程中顶梁外载的变化，从而提高了两柱式支架对放顶煤工作面围岩活动规律的适应性。研究结果对于现场操作及新架型的改进都有一定的指导作用。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。