不同孔隙度中心受压圆形薄板试样渗透特性试验研究  

Experimental study on permeability parameters of circular thin plate specimens with different porosities under center pressure

作　　者：张天军[1] 任金虎 许鸿杰[2,3] 潘红宇[4] 尚宏波[4] ZHANG Tianjun REN Jinhu XU Hongjie PAN Hongyu SHANG Hongbo(Xi＇an University of Science and Technology, Faculty of Science, Xi＇an 710054, China AVIC Information Technology Co. Ltd., Beijing 100028, China Northwestern Polytechnical University, College of Aviation, Xi＇an 710072, China Xi＇an University of Science and Technology, College of Safety Science and Engineering, Xi＇an 710054, China)

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]中航工业信息技术中心金航数码科技有限责任公司,北京100028 [3]西北工业大学航空学院,陕西西安710072 [4]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《中南大学学报（自然科学版）》2016年第12期4154-4162,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51174158;51374168;51474172)~~

摘　　要：通过控制砂粒粗细的方法自制不同孔隙度的圆形薄板试样,利用RSM-SY7基桩多跨孔超声波自动循测仪测量其孔隙度值并进行标记。利用自主研发的渗透试验装置,在DDL600电子万能试验机上进行中心受压圆形薄板试样弯曲变形过程中的渗透特性试验;研究孔隙度对圆形薄板试样轴向抗压强度、初始渗透率的影响及其对圆形薄板试样弯曲变形过程中轴向载荷与渗流量出现峰值时间差的影响,并研究圆形薄板试样弯曲变形过程中渗透率的变化规律。研究结果表明:不同孔隙度中心受压圆形薄板试样弯曲变形过程中,其渗透率均在整体上呈现先增大后减小的趋势;试样的孔隙度越大,其轴向载荷峰值Fmax、初始渗透率整体越趋于减小;当试样孔隙度较大时,其弯曲变形过程中轴向载荷F峰值先于流量Q峰值出现,反之,其流量Q峰值先于轴向载荷F峰值出现。The circular thin plate specimens of different porosity were made by the method of controlling sand sizes. RSM-SY7 automatic ultrasonic measuring instrument with foundation piles and more cross-holes was used to measure and mark the values of porosity. Permeability test in the process of bend and deformation of thin circular plate specimens under axial compression was carried out by DDL600 electronic universal testing machine and self-developed infiltration testing device; the axial compressive strength and initial permeability of the circular thin plate specimens caused by porosity were investigated; time difference between axial load and peak of seepage flow caused by the porosity in deformation process of the circular thin plate bending specimen was explored; the permeability variation of circular thin plate specimens in the process of bending deflection was also studied. The results show that in the process of bending deflection of the circular thin plate, the permeability of the circular thin plate specimens in different porosities has a tendency of initial increase then decrease in general when the center of the circular thin plate specimens is compressed. The greater the porosity of the sample, the smaller the axial loadpeak value of Fmax and the initial permeability. When the porosity of the sample is becoming larger, the axial loadpeak value of Fmax emerges prior to the flow of Q peak. Conversely, the flow of Q peak emerges prior to the axial loadpeak value of Fmax.

关 键 词：圆形薄板试样 渗透特性 弯曲变形 挠度 孔隙度 

分 类 号：TD315[矿业工程—矿井建设]