摘要
为了研究煤层底板陷落柱活化破坏特征及诱发的突水机理,采用RFPA2D模拟了全充水强导水型和边缘充水导水型陷落柱的活化突水过程.数值模拟再现了流固耦合作用下全充水导水型陷落柱克服剥离面上的黏结力、柱边滑动面上的抗滑阻力,最终发生发生活化崩塌的过程以及边缘充水导水型陷落柱从边缘裂隙的扩张、贯通到宏观导水通道形成的全过程.分析结果表明,突水通道形成受陷落柱本身的物理力学性质以及开采应力扰动等因素的共同控制,陷落柱构造的存在影响了原岩应力应变的均匀分布,在开采扰动时,这种影响表现的更为突出,在应变不协调部位容易产生剪切变形与损伤,加之高压渗透水流的楔劈作用,致使陷落柱逐步活化而引发突水.
In order to study the failure pattern of collapse columns and mechanism of water inrush from coal seam floor, we simulated the water inrush process due to activation of collapse columns with full water-filling and border water-filling using RFPA^2D code. The numerical simulation duplicated the whole process of forming the macro water conducting channels from water filling collapse columns. The results show that the formation of water inrush pathway is affected by both physical characteristics of collapse columns and by mining induced stress disturbance, this is particularly true during mining activity. Together with the hydraulic fracturing of confined aquifer, shear deformation is easy to take place, making the collapse columns gradually activated, resulting in water inrush at last.
出处
《采矿与安全工程学报》
EI
北大核心
2009年第2期158-162,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2007CB209400)
国家自然科学基金项目(50820125405)
国家自然科学基金重点项目(40638040)
关键词
突水过程
陷落柱
数值模拟
活化过程
流固耦合
water inrush process
karstic collapse columns
numerical simulation
activation process
coupling of solid and seepage flow
