board and pillar是什么意思

网络释义

用法例句

Because Zhaokou mine of Jinling iron mine of Shandong make use of strata pressure controlling theory to do reasonable dividing for declinate ore body room and pillar,the calculated recovery ratio η is up to 73 6% and maintaining the stability of mining field at the same time.

山东金岭铁矿召口分矿运用地压控制理论，对倾斜矿体房柱进行合理划分，计算回采率η达７３。

Application of room-pillar method with artificial roof support in Dongbaoshan mine;

人工顶柱房柱法在东宝山矿区的应用

Discussion on ventilation leakage law in gateway of room and pillar mining;

关于房柱式开采巷道漏风规律的探讨

Regarding that North American and Japan insist Short?wall mining,author thinks that if combinding with advanced supporting and cutting technique,room and pillar mining technique still has advantages.

统观北美和日本地区坚持短壁式采煤工艺所带来的成就 ,回顾以往的房柱式采煤工艺 ,如果配以先进的支护技术和落煤技术 ,将会再现房柱式采煤工艺的优势。

The dangerous and hazardous factors are analyzed in the inclined and bedded gypsum mineral deposit underground mining by pillar-and-room method.

本文对缓倾薄层石膏矿床房柱法开采过程中存在的危险危害因素进行了分析,指出采空区坍塌是最重要的危险危害因素,分析认为矿体基本力学性质和采矿方法是影响采空区坍塌的主要因素,提出了当前应优先考虑的安全管理和安全技术新对策。