Research and application of schemes for constructing concrete pillars in large section finishing cut

来源 :矿业科学技术学报:英文版 | 被引量 : 0次 | 上传用户:cai372751072
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Based on the technology of controlling surrounding rock deformation by constructing concrete pillars in large section finishing cut in backfill coal mining, the characteristics of vertical stress on concrete pillars and main factors influencing pillar sta
其他文献
<正> 对于一个合资企业来说,外国投资所占的比例直接决定着外资对企业的支配权和利润分配比例等权益问题。不少国家,为加强和实现对外资的监督与管理,在立法中确定了外国投资比例的上限,也有的规定了上、下限。具体情况又因各国条件不同而有所区别。一般说来,西方工业国对外国投资比例均不作上限规定。二次大战以后,随着资本主义经
Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam,the long distance of coal gangue caving,as well
In the flotation process,bubble is a key factor in studying bubble-particle interaction and fine particle flotation.Knowledge on size distribution of bubbles in
<正> 进入八十年代以来,对等贸易(Counter trade,亦称反向贸易)又有了新的发展,增长的势头持续不衰。从地域上来看,不仅东西方、南北方贸易采用这种方式,就连发达国家之间也在开展对等贸易。1972年仅有12个国家和地区进行对等贸易。1983年已达88个国家和地区,其中就有14个是发达国家。从商品和贸易结构来看,对等贸易既适用于机械设备、制成品和初级产品,也适用于高技术产品。尤其是,这种贸易方式突破了传统的商品贸易的局
Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway
In order to analyze the origin of carbon monoxide(CO) in coal seams, stress–strain experiments under temperature of 50, 150 and 250 &#176;C were conducted using
它是粉碎处理的一个确定的事实,压碎并且磨擦,最多于全部的精力的一半说明的集中的进程在矿物质工业消费了的精力。各种各样的其他的预告的处理方法被专家在地球附近试试。尽管
This paper analyzes the control mechanism of coal and gas outbursts and proposes the concept of an effective pressure relief protection range, based on the stre
期刊
The heat How generated from the infinite rock mass surrounding the underground tunnels is a major cause for the increasing cooling demands in deep mine tunnels.
In the eastern Ordos basin, due to the diversity of the tectonic setting, coal rank, gas content and permeability, coal reservoirs have differing characteristic