Study on suspension performance of on-site preparation of fire prevention and extinguishing thickened slurry

doi:10.16265/j.cnki.issn1003-3033.2026.09.1421

Abstract

Abstract:

To address the engineering problems of traditional loess fire-extinguishing slurry, such as easy sedimentation, pipeline blockage and accumulation failure, and improve the suspension stability of thickened slurry, mechanical analysis of loess particles was carried out to derive the settling velocity formula. It was clarified that stirring time, stirring speed and particle size affect suspension characteristics by changing the interaction forces between particles. Combined with range analysis, variance analysis, regression analysis and response surface analysis, the priority of influencing factors and the optimal parameter range were determined, and the practicability of the parameters was verified through on-site grouting monitoring. The results show that the stirring time of slurry A and the stirring speed of slurry B can cause shear thinning of the thickened slurry, thereby changing its three-dimensional network structure and intermolecular entanglement; the size of loess particles C will affect their specific surface area, mechanical effects, and agglomeration behavior in the slurry. These three factors together affect the consistency and suspension performance of the slurry. The static suspension rate of the thickened slurry reaches the optimal level of 82.5% when A is 5 min, B is 1000 r/min, and C is 140 mesh. The primary and secondary ranking of each factor on the static suspension rate δ is B>A>C, indicating that stirring speed is a key factor affecting the static suspension rate of thickened slurry. The optimal ranges of factors influencing the suspension effect of thickened slurry materials are determined as 4.3 min ≤ A ≤ 5.9 min, B = 1000 r/min and 108 mesh ≤ C ≤ 167 mesh. The analysis results are basically consistent with those of range and variance analysis, which verifies the validity of the range and variance analysis results. Field grouting test results verify that the optimal preparation parameters obtained from laboratory experiments provide reliable guidance for on-site grouting performance.

Key words: on-site preparation, fire prevention and extinguishing, thickened slurry, suspension performance, response surface, static suspension rate, on-site factors

CLC Number:

X936

Shao Shuzhen, Shi Shiliang, Wang Lei, Lu Yi, Xing Shunbo, Tian Shuai. Study on suspension performance of on-site preparation of fire prevention and extinguishing thickened slurry[J]. China Safety Science Journal, 2026, 36(9): 147-156.

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水平	影响因素
水平	A/min	B/(r/min)	C/目
1	3	250	60
2	4	500	100
3	5	750	140
4	6	1 000	180

试验号	水平组合	试验条件
试验号	水平组合	A/min	B/(r/min)	C/目
1	A₁B₁C₁	3	250	60
2	A₁B₂C₃	3	500	140
3	A₁B₃C₄	3	750	180
4	A₁B₄C₂	3	1 000	100
5	A₂B₁C₂	4	250	100
6	A₂B₂C₄	4	500	180
7	A₂B₃C₃	4	750	140
8	A₂B₄C₁	4	1 000	60
9	A₃B₁C₃	5	250	140
10	A₃B₂C₁	5	500	60
11	A₃B₃C₂	5	750	100
12	A₃B₄C₄	5	1 000	180
13	A₄B₁C₄	6	250	180
14	A₄B₂C₂	6	500	100
15	A₄B₃C₁	6	750	60
16	A₄B₄C₃	6	1 000	140

试验号	A/min	B/(r/min)	C/目	δ/%
1	3	250	60	17.50
2	3	500	140	50.00
3	3	750	180	72.50
4	3	1 000	100	81.00
5	4	250	100	25.00
6	4	500	180	55.00
7	4	750	140	78.75
8	4	1 000	60	81.25
9	5	250	140	56.25
10	5	500	60	62.50
11	5	750	100	81.25
12	5	1 000	180	82.00
13	6	250	180	42.50
14	6	500	100	68.75
15	6	750	60	80.00
16	6	1 000	140	82.50

试验号	静态悬浮率/%
试验号	A	B	C
K₁	221.00	141.25	241.25
K₂	240.00	236.25	256.00
K₃	282.00	312.50	267.50
K₄	273.75	326.75	252.00
K₁'	55.25	35.31	60.31
K₂'	60.00	59.06	64.00
K₃'	70.50	78.13	66.88
K₄'	68.44	81.69	63.00
R	15.25	46.38	6.56
优水平	A₃	B₄	C₃
主次顺序	B>A>C
优组合	A₃B₄C₃

方差来源	平方和	自由度	均方	F	P值
A	614.73	3	204.91	2.662	0.142
B	5 435.574	3	1 811.858	23.541	0.001^**
C	88.168	3	29.389	0.382	0.77
误差	461.805	6	76.967	—	—
总计	71 211.563	16	—	—	—