查询词典 caving-in

Bloodstone addition to the above assessment of several caving, but also watch for fraud.

昌化鸡血石的评价除以上几放面外，还要注意有无作假。

The new year want to change this, and all want to think about good caving face.

新的一年本想改变自己，一切都想向好的方面去想。

At the same time, a computer aided ore drawing control system for the block caving of Chengchao Iron Mine is developed. This may promote the management level of block caving and finally increase economic benefit of the mine.

同时，开发了程潮铁矿矿块崩落法放矿计算机辅助管理系统，该系统可以提高矿块崩落法放矿的现代化管理水平，提高矿山企业的经济效益。

Supporting type is suggested to be developed into 3-prop to improve adaptability besides 2-prop and 4-prop. The difference of caving difficulty degree of coal seam is the base of caving coal method at high, medium and low position. Caving with small step and open caving flashboard used widely not only cause serious mixture of coal and rock but also hinder the improvement of top coal recovery. So we suggest caving with large step or closing caving door. Four-bar-mechanism of hydraulic support restricts development of new style caving powered support. Stabilization framework of expansion link and all-shield caving tail beam at high, medium and low position are introduced here.

支架支护型式，除了两柱、四柱以外，建议开发三柱支架以改善适应性；煤层冒放性的差异，是高位、中位和低位放煤方法存在和使用的依据；目前广泛采用的小步距放煤和开放式放煤插板不仅造成严重混矸漏矸，也妨碍顶煤回收率的进一步提高，建议采用大步距放煤和可关闭放煤口；液压支架四连杆稳定机构，制约了新型放顶煤液压支架的开发，介绍了液压支架伸缩杆稳定机构及全掩护拖移高位、中位和低位放煤尾梁。

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。

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。

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。

Field tests of the technology indicate that explosive consumption is low, ore caving per unit hole is high, and blasting quality and continuity of roof are perfect because of high application rate of explosive energy and controlled caving technique.

工业试验表明，由于创造了充分利用炸药能量和控制爆破作用的良好条件，矿岩破碎质量好、大块率低，爆破炸药单耗低、炮孔每米崩矿量高，边帮、直接顶板的完整性保护效果良好。

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。