基于Morris法的单裂隙岩体温度场参数灵敏度分析  

Parameter sensitivity analysis of temperature field in single fracture rock mass based on Morris

作　　者：刘波[1] 金爱兵[1] 高永涛[1] 邓富根[2] 

机构地区：[1]北京科技大学土木与环境工程学院金属矿山高效开采与安全教育部重点实验室,北京100083 [2]国家开发银行股份有限公司青海省分行,青海西宁810001

出　　处：《采矿与安全工程学报》2016年第1期152-157,共6页Journal of Mining & Safety Engineering

基　　金：中央直属高校基本科研业务费项目(FRF–SD–12–002A);霍英东青年教师基金项目(122024)

摘　　要：通过数值模拟(3DEC)的方法,建立深部单裂隙岩体水流-传热模型,再结合Morris全局敏感性分析法,通过一次只改变一个参数的取值方法轮流计算各参数的"基本影响",并计算它们的均值μ和方差σ,根据μ和σ的大小判断各参数对模型温度值输出影响情况,并分析μ和σ的时空变化规律。结果表明:裂隙开度(b)、水岩热交换系数(h)、岩体热传导率(K^T)、岩体比热容(C_s)、流体比热容(C_f)对模型温度值的输出影响较大,且岩体热传导率(K^T)、岩体比热容(C_s)、裂隙开度(b)与其他参数产生较大的相互作用;μ和σ随着时间步的增加大致可以分为3个阶段,即快速增加阶段、缓慢增加阶段和稳定阶段;沿着裂隙流体流动方向与裂隙法向方向,各参数的μ和σ呈现减小的趋势;岩体比热容(C_s)对温度值的影响是正作用关系,裂隙开度(b)、流体比热容(C_f)是负作用关系,水岩热交换系数(h)、流体速度(u)、岩体热传导率(K^T)根据位置不同,既有正作用关系,又有负作用关系。Based on the three-dimensional discrete element numerical simulation（3DEC）, the model of flow and heat transfer in single fracture rock mass has been established. Furthermore,combined with global sensitivity analysis method of Morris, the＂elementary effect＂of each parameter has been calculated by the value variation of one parameter in turn. In addition, the mean value μ and variance σ have also been obtained. Moreover, according to the value of μ and σ,the effect of each parameter on model temperature output and the law of the spatial and temporal distribution of μ and σ have been analyzed. Research results have shown that：slit aperture（b）, fluid-rock heat transfer coefficient（h）,rock Thermal conductivity（K^T）, rock mass specific heat（C_s）, and fluid specific heat（C_f） have an important impact on the temperature output of the model, what is more, rock thermal conductivity（K^T）, rock mass specific heat（C_s）, and slit aperture（b） have a great interaction with other parameters. With the increasing of time step, μ and σ could be basically divided into 3 stages： rapidly increasing stage, slowly increasing stage and stable stage. Furthermore, along with the direction of fracture fluid flow and crack normal, the value of μ and σ has presented a decreasing tendency. More interestingly, compared with the negative influence of b and C_f on the temperature value, C_s has presented a positive effect. However, for the different positions of h, u and K^T, those parameters have both positive and negative effects.

关 键 词：单裂隙岩体 温度场 Morris法 参数灵敏度分析 

分 类 号：TD353[矿业工程—矿井建设]