岩土力学2017，Vol.38Issue(4)：1179-1187,9.DOI:10.16285/j.rsm.2017.04.032
全风化花岗岩突水通道扩展的颗粒起动流速研究
Research on particle starting velocity in the expansion of water inrush channel in completely weathered granite
摘要
Abstract
Water and mud inrush is a common geological disaster in the completely weathered granite tunnel during construction.The key factor leading to the expansion of water inrush channel is the loss of soil particles,where the starting velocity is the critical condition of its loss.By considering the water erosion and particles adhesion,the particle 3D force in the water inrush channel cross-section was analyzed,and the function of particles starting velocity was established.The function includes the following factors,namely,the particle diameter,the particle position of channel cross-section and relative exposure degree of the particle.Meanwhile,numerical simulation was conducted to analyze the effect of the above three factors on the starting velocity.Numerical results showed that the starting velocity decreased initially and then increased with the increase of particle diameter.Furthermore,the starting velocities of channel cross-section at different positions were symmetry,and they were increased with the increase of relative exposure degree generally.By combining with orthogonal tests to analyze the sensitivity to starting velocity for the above three factors,the results showed that the diameter was the most sensitive factor.Accordingly,by considering the minimum starting velocity standard of channel cross-section and the randomness of relative exposure degree,the factors of particle position of channel cross-section and relative degree of exposure were simplified,and a simplified theoretical formula of the starting velocity was developed.Finally,the rationality of the starting velocity formula was verified by the laboratory test and field investigation.关键词
全风化花岗岩/突水通道/起动流速/粒径/颗粒坡面位置/相对暴露度Key words
completely weathered granite/water inrush channel/starting velocity/particle diameter/particle slope position/relative exposure degree分类
建筑与水利引用本文复制引用
刘金泉,杨典森,陈卫忠,袁敬强,李长俊,亓宪寅..全风化花岗岩突水通道扩展的颗粒起动流速研究[J].岩土力学,2017,38(4):1179-1187,9.基金项目
国家重点基础研究发展计划973项目研究课题(No.2013CB036006) （No.2013CB036006）
国家自然科学基金(No.51379200,No.51225902).This work was supported by National Basic Research Program of China (973 Program) (2013CB036006) and National Natural Science Foundation (51379200,51225902). （No.51379200,No.51225902）
