磷石膏胶结充填体动态力学特性研究

doi:10.11872/j.issn.1005-2518.2022.04.183

Abstract

Abstract:

In order to study the influence of rock drilling and blasting on the stability of phosphogypsum cemented filling body with different phosphogypsum-to-the new mortar ratios and different curing times，the dynamic mechanical properties of the phosphogypsum cemented filling body were studied.By using the Hopkinson pressure bar（SHPB） experimental device to axially impact filling body at different loading speeds，the waveform curves，stress-strain curves，dynamic compressive strength，dynamic increase factor（DIF），the failure modes，and the relationship between the average strain rate of the filling body and the ratio of the filling materials were analyzed.The results show that the wave impedance of the phosphogypsum cemented filling body is small and can dampen the stress wave.Under the conditions of the same ratio，same curing and different strain rates，the descending section of the stress-strain curve of the filling body is basically the same，while the difference in the ascending section is more obvious.For the group with the highest static compressive strength，the growth rate of stress increases rapidly with the increase of strain，while the dynamic compressive strength and DIF both increase with the increase of the average strain rate，and the relationship between the dynamic compressive strength，DIF and average strain rates can be described by polynomial functions.When the curing time is the same，with the increase of the new phosphogypsum mortar ratio，the dynamic compressive strength and DIF of the filling body decrease，and relationship between the dynamic compressive strength of the filling body，DIF and the new phosphogypsum mortar ratio presents a polynomial function.When the proportion of new phosphogypsum mortar is the same，with the increase of curing time，the dynamic compressive strength and DIF of the filling body increase，and the dynamic compressive strength and DIF of the filling body have a polynomial function relationship with the curing time.When the average strain rate is less than 100 s^-1，the fractured shape of the fillings is blocky，and when the average strain rate reaches 300 s^-1，the fractured shape of the filling body is already powdery，indicating that the critical value of the average strain of the phosphogypsum cemented filling body is between 100 s^-1 and 300 s^-1.When the proportion of new phosphogypsum mortar is the same，the longer the curing time is，the lower the pulverization degree of the filling body is.When the curing time is the same，the larger the proportion of new phosphogypsum mortar，the higher the pulverization degree of the filling body.

Key words: phosphogypsum cemented filling body, Hopkinson pressure bar, strain rate effect, dynamic compressive strength, mechanical properties, dynamic increase factor

CLC Number:

X936

Yefan LIU,Ying SHI. Study on Dynamic Mechanical Characteristics of Phosphogypsum Cemented Filling Body[J].Gold Science and Technology, 2022, 30(4): 574-584.

Figures/Tables 17

Table 1

Test results of particle size distribution of phosphogypsum samples"

粒径分布参数	数值
D₁₀/ $μ m$	18.10
D₃₀/ $μ m$	35.30
D₆₀/ $μ m$	69.20
Cu=D₆₀/D₁₀	3.82
Cc=D₃₀²/（D₆₀*D₁₀）	0.99

Table 1

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Table 2

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Table 3

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Table 4

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养护时间/d	拟合类型	R²			平均值
养护时间/d	拟合类型	1∶4	3∶7	2∶3	平均值
14	线性	0.93	0.90	0.90	0.91
	多项式	0.93	0.90	0.93	0.92
	指数	0.91	0.87	0.87	0.88
28	线性	0.98	0.93	0.92	0.94
	多项式	0.98	0.94	0.97	0.96
	指数	0.93	0.90	0.84	0.89

养护时间/d	拟合类型	R²			R² 平均值
养护时间/d	拟合类型	1∶4	3∶7	2∶3	R² 平均值
14	线性	0.89	0.88	0.83	0.87
	多项式	0.89	0.89	0.93	0.90
	指数	0.87	0.83	0.80	0.83
	对数	0.82	0.88	0.91	0.87
28	线性	0.97	0.90	0.91	0.93
	多项式	0.97	0.90	0.92	0.93
	指数	0.95	0.89	0.89	0.91
	对数	0.92	0.87	0.93	0.91

拟合类型	R²			R²平均值
拟合类型	1∶4	3∶7	2∶3	R²平均值
线性	0.96	0.95	0.99	0.97
多项式	0.97	0.97	1.00	0.98
指数	0.71	0.95	0.88	0.85
对数	0.96	0.88	0.97	0.94

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Study on Dynamic Mechanical Characteristics of Phosphogypsum Cemented Filling Body

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