外荷载下青砂岩声发射特征及损伤演化规律

doi:10.11872/j.issn.1005-2518.2023.03.142

Abstract

Abstract:

As a micro-unit combination of geotechnical engineering， rock will be accompanied by complex AE signals and damage evolution characteristics during the loading process.In order to analyze the AE characteristics and damage evolution law of green sandstone under external load， a two-dimensional damage cell model of green sandstone was established based on acoustic emission，according to the self-organization， clustering behavior and power law distribution characteristics of rock damage evolution，combined with the structural characteristics of sandstone， fractal theory and Weibull distribution function.The results show that： The linear mutation of the axial stress curve of green sandstone sample in the plastic deformation stage at the late loading stage is the final result of the failure of the sample， and the failure value is 48.5 MPa. At this stage， large cracks are formed due to the combination of microcracks，resulting in the absence of event rate.This phenomenon is the precursor feature of the failure of the sample，and the main failure modes are single-bevel shear failure and double-bevel shear failure.The forming crack is shear crack.The three stages of loading damage of the sample are similar to the characteristics of AE signals.In the damage initiation stage， due to the internal microdefects of the sample affected by mine production， damage evolution will be formed at this stage， but the interval damage value is 0.41， which is lower than the unstable damage value of the established cellular model（0.43）.No failure or instability failure occurs until the damage deformation stage.When the damage value increases to 0.599 （greater than 0.43）， instability failure occurs in the sample， and the damage value rapidly increases to 1.Therefore， it can be concluded that the two-dimensional cellular model established by the relevant laws and theories of rock damage evolution can reflect the mechanical failure process and damage evolution law of bluestones under external loads， which can provide reference for related studies.

Key words: progressive destruction, creep deterioration, damage evolution, elastic deformation, plastic deformation, shear failure

CLC Number:

TD315

Wencai WANG,Junpeng LI,Chuangye WANG,Shijiang CHEN,Peng WANG. Acoustic Emission Characteristics and Damage Evolution of Green Sandstone Under External Loads[J].Gold Science and Technology, 2023, 31(3): 516-530.

Figures/Tables 24

Fig.1

Table 1

Fig.2

Fig.3

Fig.4

Table 2

Fig.5

Table 3

Axial stress test results of green sandstone samples"

岩性	试样编号	单轴抗压强度σ_c/MPa	平均值 $σ ˉ c$ /MPa
青砂岩（QSY）	QSY₁	48.5	48.7
	QSY₂	47.7
	QSY₃	49.8

Table 3

Fig.6

Fig.7

Fig.8

Table 4

Table 5

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Fig.16

Fig.17

Table 6

Fig.18

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岩性	试样编号	直径/mm	高度/mm	形状
青砂岩	QSY₁	49.22	100.28	圆柱体
	QSY₂	49.32	99.80	圆柱体
	QSY₃	49.24	100.34	圆柱体

试样编号	体积/cm³	信号量	孔隙率/%
QSY₁	190.71	1 867	3.12
QSY₂	190.57	1 877	3.24
QSY₃	190.98	1 914	3.71

参数名称	青砂岩试样及试验结果
参数名称	QSY₁	QSY₂	QSY₃
阶段Ⅰ累积事件数/个	3 681	3 573	3 812
阶段Ⅰ累积能量/［（mV·μs） ·s^-1］	2.81×10⁵	2.73×10⁵	2.93×10⁵
阶段Ⅱ累积事件数/个	9 381	8 768	9 627
阶段Ⅱ累积能量/［（mV·μs）·s^-1］	5.79×10⁵	5.42×10⁵	5.91×10⁵
阶段Ⅲ累积事件数/个	14 379	13 694	15 098
阶段Ⅲ累积能量/［（mV·μs）·s^-1］	9.07×10⁵	8.46×10⁵	9.24×10⁵

主频类型	青砂岩试样及试验结果
主频类型	QSY₁	QSY₂	QSY₃
高频/kHz	117~241	122~250	120~248
中频/kHz	42~117	44~122	44~120
低频/kHz	0~42	0~44	0~44

Acoustic Emission Characteristics and Damage Evolution of Green Sandstone Under External Loads

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被破坏单元胞数	被破坏单元数量	未被破坏单位数量	应力扩散元胞相邻已损坏元胞数
被破坏单元胞数	被破坏单元数量	未被破坏单位数量	1	2	3	4
0	0	1	0	0	0	0
1	0	9	24	0	0	0
2	16	20	60	22	0	0
3	68	16	28	36	8	0
4	120	6	0	16	8	1
5	125	1	0	0	4	0
6	84	0	0	0	0	0
7	36	0	0	0	0	0
8	9	0	0	0	0	0
9	1	0	0	0	0	0

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