基于可靠度理论的钢筋混凝土假顶强度确定 与配筋设计研究

根据贵州开磷集团用沙坝矿中厚破碎矿体条件, 采用钢筋混凝土人工假顶下向分段充填法开采方法, 在上分段设计施工钢筋混凝土人工顶板, 使用可靠度理论分析了各参数对假顶强度的影响程度, 探讨出人工假顶可靠概率下的合理取值, 得出钢筋混凝土顶板可靠概率为90%时的假顶承载强度, 以及该强度下的假顶厚度值以及合理配筋值。基于可靠度理论的假顶强度确定方法与配筋设计结果表明, 采场跨度对假顶强度影响最大, 在大跨度、高载荷下假顶承载强度满足需求, 矿山效益及回采安全性得到提高。

Strength Determination for Reinforced Concrete False Roof and Reinforcement Design Based on Reliability Theory

Based on the actual condition of medium-thickness fractured orebody in Yongshaba Mine of Guizhou Kailin Group, an application of underhand cut-and-fill mining method was proposed in which reinforced concrete false roof was constructed. Firstly, a reinforced concrete false roof was designed in the upper subsection. After the influence of parameters on such false roof was analyzed based on reliability theory, the load-bearing strength and thickness of the reinforced concrete false roof, as well as practical reinforcement design under the reliable probability of 90% was concluded. The false roof strength determination and reinforcement design based on reliability theory show that the stope span has the greatest influence on the false roof strength. The load-bearing strength of false roof designed can meet the requirement under the condition of large span and high load, ensuring both mining benefit and operation safety on mine.