金矿超深立井含水围岩注浆加固的应力场和渗流场研究  

Research on stress and seepage fields of surrounding rock grouting of ultra-deep shafts of gold mines

作　　者：周晓敏[1,2] 徐衍[1,2] 刘书杰 和晓楠 ZHOU Xiaomin;XU Yan;LIU Shujie;HE Xiaonan(School of Civil and Resource Engineering School,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学木与资源工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《岩石力学与工程学报》2020年第8期1611-1621,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：“十三五”国家重点研发计划课题基金项目(2016YFC0600803);国家自然科学基金资助项目(5167082378);中央高校基本科研业务费专项资金(FRF-BD–18–007A)。

摘　　要：为了适应矿山超深竖井建设发展,首先在引言中通过超深竖井实际施工和永久支护设计中存在的矛盾和难点,提出基于弹性状态解决工程问题的目的和思路。其次,基于达西渗流定律、太沙基有效应力原理和连续介质弹性力学理论,研究黄金矿超深竖井含水地层注浆加固渗流场与应力场耦合的数学模型,推导渗流场及应力场的解析表达式。通过与数值方法对比,验证解析公式的准确性。第三,通过公式图形化展示,研究注浆加固体的渗透系数、注浆半径、泊松比、弹性模量等对于井筒注浆加固体及附近围岩应力场和渗流场的影响规律;运用山东新城金矿新主井算例分析得出的曲线和数据表格,定量展示以注浆注浆半径和渗透系数来对井筒涌水量进行控制的注浆设计方法。研究表明,降低加固体渗透系数和泊松比、增大注浆半径等能有效降低加固体和围岩的有效应力,即有利于改善围岩受力,同时能有效地降低井筒涌水量;上述研究可为井筒注浆设计提供理论参考。In order to meet with the development of ultra-deep mine shaft construction,the conflicts and tough technical problems existing in design and construction are discussed,and the aim and strategy of the solution based on the elastic state and theory of deep shaft lining design and construction are put forward in introduction. Based on Darcy’s seepage law,Terzaghi’s effective stress principal and continuous medium elasticity theory,the mathematical model of coupled seepage and stress fields under grouting consolidation in deep gold mine shafts is studied, and the expressional formulas of seepage and effective stress fields are deduced. Comparison with the numerical method verifies the accuracy of the implicit analytical expressions. By using graphical method,is the effects of the grouting radius,the permeability,the possion’s ratio and the elastic modulus of grouting area on seepage and effective stress fields are discussed. A case study on Xincheng new main shaft in Shandong province,China,is illustrated, presenting the controlling design method of grouting consolidation based on the grouting radius and the seepage conductivity. It is shown that enlarging the grouting radius or decreasing the seepage conductivity of and the Possion’s ratio can decrease the effective stress of grouting and surrounding rock,which is benefit to enhance the stability of shafts and to decrease the water flow to the shafts. The research results could provide a theoretical reference for designers and constructors.

关 键 词：采矿工程 超深竖井 金矿竖井 流固耦合 井筒注浆 基岩渗流 有效应力 

分 类 号：TD32[矿业工程—矿井建设]