多因素组合影响下向进路充填顶板稳定性计算  

Stability calculation of backfill roof in downward roadway under multifactor influence

作　　者：王晓军[1,2] 郭鹏 黄惟盛 陈智宏 陈青林 赵奎 WANG Xiao-jun;GUO Peng;HUANG Wei-sheng;CHEN Zhi-hong;CHEN Qing-lin;ZHAO Kui(School of Resources&Environment Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Wushan Copper Mine,Jiangxi Copper Industry Co.,Ltd.,Ruichang,Jiangxi 332200,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学江西省矿业工程重点实验室,江西赣州341000 [3]江西铜业股份有限公司武山铜矿,江西瑞昌332200

出　　处：《岩土力学》2022年第12期3453-3462,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52104085);江西省“双千计划”科技创新高端人才项目(jxsq2019201043);江西省青年井冈学者奖励计划(QNJG2018051)。

摘　　要：下向分层进路充填采矿法中,进路充填顶板的稳定对回采过程安全性至关重要,而分层充填体叠加载荷计算一直是顶板稳定性分析的难点。在充分考虑采动岩体荷载、矿体倾角、相邻分层间回采进路的交错布置、充填体与围岩的接触等工程实际后,推导了进路顶板平衡微分方程,求解得到进路顶板静荷载的理论值。结合回采工艺建立了“多跨梁”力学模型,并得到了回采进路顶板拉应力的理论计算公式,分析得到影响进路顶板稳定性的4个重要理论因素:顶板上部载荷σv、回采进路跨度l、1:4充填体的厚度h、充填体自身抗拉强度[σt]。为充分考虑进路顶板静载荷和回采爆破动载荷影响,利用FLAC3D对多因素影响下的顶板稳定性进行了数值模拟正交计算。根据模拟结果,分析了各因素对顶板拉应力的影响规律,利用多元非线性回归的方法建立了多因素组合影响下顶板稳定性评价模型。该模型应用到某铜矿试验采场的实际生产,具有较好的指导作用。In the downward drift cut and fill mining method, the stability of the backfill roof is very important to the safety of the mining process. However, the calculation of the superimposed load of the slicing and backfill is always a difficulty in the stability analysis of the roof. In this paper, an equilibrium differential equation of the roof is derived and its theoretical solution of the static load of the roof is obtained by fully considering the engineering practice such as the load of the mining rock, the dip angle of the ore body, the staggered arrangement of the adjacent layered roadway, and the contact between the backfill and the surrounding rock. By combining with the mining process, a mechanical model of “multi-span beam” is established, and the theoretical calculation formula of tensile stress of roof is obtained. The four important theoretical factors affecting stability of roof were analyzed: the upper load of roof σv, the roadway span l, the thickness of 1:4 backfill h, and the tensile strength of backfill itself [σt]. In order to fully consider the influence of static load and blast load on the roof, FLAC3Dis used to simulate the orthogonal calculation of roof stability under the influence of multiple factors. According to the simulation results, the influence of various factors on the roof tensile stress is analyzed,and the stability evaluation model of roof under the influence of multiple factors is established by using the method of multiple nonlinear regression. The model is applied to the field practice of a copper mine test stope, showing good practicality.

关 键 词：多跨梁 正交试验 多元非线性回归 数值模拟 

分 类 号：TU457[建筑科学—岩土工程]