Study on spontaneous expansion and diffusion characteristics of phosphogypsum based self-produced gas expansion slurry

doi:10.16265/j.cnki.issn1003-3033.2025.07.1208

Abstract

Abstract:

In order to improve the grouting efficiency and accuracy of phosphogypsum based self-produced gas expansion slurry, the change in density of phosphogypsum based self-produced gas expansion slurry with time was analyzed. Based on fluid mechanics theory and the time-varying model of slurry density, a mathematical model of the seepage diffusion pressure of the slurry during the self-produced gas expansion stage was established. Through a self-built phosphogypsum based self-produced gas expansion slurry similar model experiment system, the seepage pressure variation of phosphogypsum based self-produced gas expansion slurry in the fracture network during the self expansion stage was studied, and the mathematical model of the seepage diffusion pressure of the slurry was modified to verify the rationality of the modified mathematical model of seepage diffusion pressure. The results show that the trend of slurry density over time follows a negative exponential power characteristic. During the self expansion process, the diffusion area of the slurry increases and the increase in diffusion area of the slurry becomes smaller and smaller. The relative error between the theoretical and experimental results of the seepage pressure at the monitoring point does not exceed 10%, proving the rationality of the modified mathematical model for seepage diffusion pressure.

Key words: phosphogypsum-based self-produced gas-expanded slurry, self expansion, flow characteristics, slurry density, similar model experiment

CLC Number:

DING Yangwei, YANG Hailong, LU Yi, LIU Weiting, GU Wangxin, XIA Chuqi. Study on spontaneous expansion and diffusion characteristics of phosphogypsum based self-produced gas expansion slurry[J]. China Safety Science Journal, 2025, 35(7): 82-90.

Figures/Tables 11

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监测点序号	X/mm	Y/mm
1	250	0
2	177	177
3	177	-177
4	350	0
5	247	247
6	247	-247
7	450	0
8	318	318
9	318	-318

监测点名称	时间/s	渗流压力/kPa
1号	2	15.471
2号	2	15.983
3号	2	15.781
4号	36	0.097
5号	37	0.193
6号	38	0.202
7号	510	0.013
8号	507	0.011
9号	522	0.018

监测点	1号	3号	4号	6号	7号	9号
首次数据记录时间/s	2	2	36	38	510	522
初始半径r₀/mm	250	250	250	250	250	250
扩散距离/mm	250	250	350	350	450	450
公式预测值/kPa	14.292	14.292	0.088	0.192	0.012	0.017
试验结果/kPa	15.471	15.781	0.097	0.202	0.013	0.018
相对误差/%	7.621	9.435	9.278	4.950	7.692	5.556