摘要
为研究地下采场围岩压力拱形态影响因素主次关系,选取采场高度h、采场高跨比α、覆岩厚度H、地质强度指标GSI、侧压系数k_(0)等因素,借助FLAC^(3D)软件进行5因素4水平的正交数值模拟试验,研究影响采场压力拱形态因素敏感性,选取压力拱内边界高度H_(in)、拱顶厚度Z两个指标进行敏感性分析。研究结果表明:采场高跨比α是压力拱形态的主控因素,随着α的减小,H_(in)与Z显著增大;H与k_(0)对压力拱形态分布具有显著影响,而岩体GSI值对压力拱形态敏感性不显著;矿房高度越大,H_(in)与Z越大;侧压系数、矿房高跨比及GSI值越大,H_(in)与Z越小;采场覆岩厚度越大,H_(in)越小,Z越大。
In order to study the relationship between primary and secondary factors affecting the shape of pressure arch in surrounding rock of underground stope,the factors such as stope height h,stope height-span ratioα,overburden thickness H,geological-strength-index GSI and lateral pressure coefficient k_(0)were selected.The orthogonal numerical simulation test of five factors and four levels was carried out by FLAC^(3D)software to study the sensitivity of main control factors affecting the shape of pressure arch in stope.Two indexes of pressure arch internal boundary height H_(in)and vault thickness Z were selected for sensitivity analysis.The results show that the stope height span ratioαis the main controlling factor of the shape of the pressure arch.With the decrease ofα,H_(in)and Z increase significantly.H and k_(0)have significant influence on the shape distribution of pressure arch,while the GSI value of rock mass has no significant sensitivity to the shape distribution of pressure arch.The higher the height of the stope,the greater the H_(in)and Z;The larger the lateral pressure coefficient,chamber height to span ratio and GSI value,the smaller the H_(in)and Z value.The larger the thickness of overburden,the smaller the H_(in)and the larger the Z.
作者
甄利兵
贾敬锎
Zhen Libing;Jia Jingkai(School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,P.R.China;State Key Laboratory of Coalmine Disaster Dynamics and Control,Chongqing 400044,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S01期82-87,96,共7页
Chinese Journal of Underground Space and Engineering
关键词
压力拱
正交试验
数值模拟
敏感性分析
pressure arch
orthogonal test
numerical simulation
sensitivity analysis
