您当前所在位置: 首页 > 学者

万志军

  • 15浏览

  • 0点赞

  • 0收藏

  • 0分享

  • 155下载

  • 0评论

  • 引用

期刊论文

Study on load-bearing differences and its mechanism between front and rear legs of the powered supports in a fully mechanized sublevel caving face

万志军Z. J. Wan C. Y. Liu P. J. Yang T. Jin

,-0001,():

URL:

摘要/描述

A great deal of data obtained from production practice indicates that in medium-hard seams and softer seams the resistance of rear leg is smaller than that of front leg in a sublevel caving powered support. When caving the top-coal, the resistances of both front leg and rear leg decrease, but the resistance of front leg decreases more than that of rear leg. In some cases, the resistance of rear leg even rapidly lowers to zero. This will seriously bring bad influence to making full use of the load-carrying capacity of the support, and damage the relation between support and surrounding rocks. So that to damage the control of the surrounding rocks of the face. The theory analysis points out that because the top-coal closed the gob is very fragmentized, lowering of the stiffness brings lowering of the load-carrying capacity, so the support’s acting point of the load moves frontward and thus the resistance of the rear leg is smaller than that of the front leg. Because of the top-coal’s further fracturing and moving the fact becomes more serious when top-coal is caving. The extreme case is that the resistance of the rear leg decreases to zero. Based on the theory analysis, the paper presented some measures to improve the load-bearing condition of the support. For example, changing the structure of the powered support and not caving too much top-coal, etc.

关键词:

【免责声明】以下全部内容由[万志军]上传于[2007年11月07日 10时51分46秒],版权归原创者所有。本文仅代表作者本人观点,与本网站无关。本网站对文中陈述、观点判断保持中立,不对所包含内容的准确性、可靠性或完整性提供任何明示或暗示的保证。请读者仅作参考,并请自行承担全部责任。

我要评论

全部评论 0

本学者其他成果

    同领域成果