单结构重构顶板的组分决策研究

Research on Composition Decision of Rebuilding Roof with Single Structure

为实现地下矿山人工顶板的精细配比决策,配置砂灰比为4∶1、6∶1、8∶1、10∶1的4组全尾砂充填体开展抗拉劈裂试验,从抗拉角度探究充填体顶板的配比决策理论模型。通过室内试验获取充填体抗拉力学参数及强度曲线,定义充填体砂灰比为参变量,利用损伤理论建立充填体抗拉强度模型。从拉应力角度分析地下矿山重构人工顶板的应力特征,建立人工顶板的抗拉受力模型。基于能量理论,建立重构人工顶板的配比决策模型。计算模型结果表明,砂灰比显著影响充填体抗拉特性,决策模型与重构顶板结构参数及顶板顶部荷载有关。示例验算表明该决策模型合理可行,能实现人工重构顶板组分的更优决策。

In order to achieve the fine proportioning decision of the composition of rebuilding artificial roof in underground mine,4 sets of full tailings filled with sand cement ratio of 4∶1,6∶1,8∶1 and 10∶1 were tested for tensile splitting tests.From the perspective of tensile strength,the theoretical model of proportioning decision of filling body roof is explored.The tensile parameters and the strength curves were of the filling body were obtained through the laboratory test,he sand cement ratio of the filling body was defined as the parameter,and the tensile strength model of the filling body was established by the damage theory.The stress characteristics of theartificial roof in underground mine reconstruction are analyzed from the perspective of tensile stress,and the tensile force model of artificial roof is established.Based on the energy theory,a matching decision model for reconstructing artificial roof is established.The calculation model results show that the sand-cement ratio has a significant effect on tensile characteristics of the filling body,and the decision model is related to the structural parameters of rebuilding artificial roof and the roof load.It is proved by a case that the decision model is reasonable and feasible,and better composition decision of rebuilding artificial roof can be obtained.