防灾减灾工程学报2018，Vol.38Issue(1)：1-6,6.DOI:10.13409/j.cnki.jdpme.2018.01.001
单层采动诱发长壁开采水平岩层开裂、冒落过程模拟——基于连续-非连续方法
Modeling of Cracking and Caving of Horizontal Strata Induced by the Excavation of a Single Stratum in Long-wall Mining——Based on a Continuum-discontinuum Method
摘要
Abstract
A continuum-discontinuum method is proposed to model a series of complex mechanical behaviors of quasi-brittle materials (rocks,concretes,etc.),such as deformation,cracking,contact,friction and rotation.The method benefits from the Lagrange element method,the discrete element method and the fictitious crack model.Compared with the continuum method,the proposed method can model true cracking phenomena without remeshing.Compared with the discontinuum method,the proposed method can well treat the continuum medium before cracking.A numerical study is conducted to model the cracking and caving of horizontal strata induced by the excavation of a single stratum in long-wall mining.Results show that as the work face advances,the bed separation and cracking continuously occur in the roof.Rock blocks also continuously cave,and the region with lower vertical stresses in the roof is trapezoidal,whose size increases gradually until reaching a stable value.At two lateral sides and the top of the trapezoid,obvious cracks are observed;at other positions of the trapezoid,cracks are compacted.At two lateral sides of the trapezoid,rock blocks are obliquely arranged in the form of masonry structures.If the size of the ore body in an excavation and the number of timesteps between two adjacent excavations are increased,the caving of the roof arrives later,and the trapezoid tends to be more symmetric.These differences are related to the dependence on the loading/unloading history for a non-liner dynamic system.It has to be noted that shear fractures and the effects of hydraulic supports have not been considered in the present simulation.关键词
采动/岩层/开裂/冒落/连续-非连续方法/顶板/长壁开采Key words
excavation/strata/cracking/caving/continuum-discontinuum method/roof/longwall mining分类
矿业与冶金引用本文复制引用
王学滨,郭翔,芦伟男,齐大雷..单层采动诱发长壁开采水平岩层开裂、冒落过程模拟——基于连续-非连续方法[J].防灾减灾工程学报,2018,38(1):1-6,6.基金项目
国家自然科学基金项目(51574144)、辽宁省百千万人才工程项目(2017)资助 （51574144）
