脉动水力参数对裂隙内沉积颗粒运移规律的影响  

Influence of pulsating hydraulic parameters on migration law of deposited particles in fracture

作　　者：刘应科[1] 问小江 陈帅宇 叶国庆 LIU Yingke;WEN Xiaojiang;CHEN Shuaiyu;YE Guoqing(School of Safety Engineering,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2022年第10期44-50,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51774277)。

摘　　要：为了提高脉动水力冲刷对阻塞裂隙场的疏通效果,研究了裂隙内脉动水流的流动特性,分析了脉动水力参数对裂隙内沉积颗粒运移质量的影响;研究了压力脉动强度系数与颗粒运移质量的相关关系。结果表明:脉动水力条件下,裂隙内流体流量和压差均呈脉动变化,水流平均流速小于恒定水流的流速,且其随压力脉动振幅的增大而显著降低,随压力脉动周期的增大而小幅增大;裂隙内颗粒运移质量随压力脉动振幅的变化符合线性增大的规律,随压力脉动周期的增大呈缓慢减小的变化规律;此外,压力脉动强度系数随压力脉动振幅的增大而增大,随压力脉动周期的增大而减小;进一步地,压力脉动强度系数的增大是导致脉动水力条件下裂隙内沉积颗粒运移质量显著提升的根本原因。In order to improve the dredging effect of the blocked mining-induced fracture field by pulsating hydraulic scouring technology,the flow characteristics of pulsating water flow in fracture and the influence of pulsating hydraulic parameters on the migration mass of deposited particles in the fracture were studied;the relationship between the coefficient of pressure pulsating intensity and the migration mass of deposited particles in fracture was studied.The results show that the fluid flow rate and pressure difference in the fracture fluctuated under the pulsating hydraulic condition,the average velocity is smaller than that of constant flow.Also,the average velocity decreases significantly with the increase of pulsating amplitude,and increases slightly with the increase of pressure pulsating period;the variation of the migration mass of deposited particles with the pulsating amplitude conforms to the law of linear increase,and decreases slowly with the increase of pulsating fluctuation period;in addition,the coefficient of pulsating fluctuation intensity increases with the pulsating amplitude increasing and decreases with the pulsating fluctuation period increasing.Furthermore,the increase of the pulsating fluctuation intensity coefficient is the fundamental reason for the significant improvement of the migration mass of deposited particles in fracture under pulsating hydraulic conditions.

关 键 词：瓦斯抽采 阻塞裂隙 脉动振幅 脉动周期 压力脉动强度系数 颗粒运移 

分 类 号：TD712[矿业工程—矿井通风与安全]