Uniaxial Compression Failure Mechanism and Acoustic Emission Characteristics of Granite with Y-Type Composite Joints

doi:10.12068/j.issn.1005-3026.2024.04.014

Abstract

Abstract:

Y?type composite joints with different inclination angles are prefabricated in granite specimens using the splitting method， and uniaxial compression experiments are conducted. The effects of the inclination angle of the composite joint on the failure mode， peak strength， surface deformation field， and acoustic emission energy release characteristics are analyzed， and the failure mechanism under different failure modes is explored. The experimental results show that： 1） Rock with Y‐shaped composite joints exhibit three main failure modes： overall failure， wedge ejection failure， and failure along the main joint surface， which vary with joint inclination； 2） The angle of composite joints and the inclination angle of main joints have a negative correlation with rock strength； 3） When the failure mode transitions changes from overall failure to ejection failure and failure along the main joint， the concentrated slip deformation zone shifts from the secondary joint to the main joint， and the high‐energy AE events induce a transition from the main and secondary joint compaction and slip dislocation to the main joint compaction and slip dislocation； 4） As the inclination angle of the main joint increases， the energy released on the main joint surface is higher and the distribution of energy is more uneven.

Key words: composite joints, failure mode, strength, deformation field, acoustic emission（AE）

CLC Number:

TD 459

Peng-hai ZHANG, Qing-shan MA, Xi-ge LIU, Tian-hong YANG. Uniaxial Compression Failure Mechanism and Acoustic Emission Characteristics of Granite with Y-Type Composite Joints[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 564-572.

Figures/Tables 16

Fig.1 Composite joint prefabrication process

Fig.2 Rock mass with Y‐type composite joints

Fig.3 Sensor layout and loading mode

Fig.4 Testing system

Table 1 Physical and mechanical parameters of rock

弹性

模量

泊松比

抗压

强度

Fig.5 Failure mode

Table 2 Uniaxial compressive strength of rock mass

序号	试件	单轴抗压强度	强度折减比	角度/（°）			序号	试件	单轴抗压强度	强度折减比	角度/（°）
序号	试件	$M P a$	%	$θ 1$	$θ 2$	$θ T$	序号	试件	$M P a$	%	$θ 1$	$θ 2$	$θ T$
1	sy2.1	118.08	30.37	30	50	80	10	sy2.1	102.12	39.78	44	45	90
2	sy2.2	121.60	28.29	30	50	80	11	sy2.2	75.34	55.57	45	45	90
3	sy2.3	113.34	33.17	30	50	80	12	sy2.3	37.13	78.10	45	45	90
4	sy7.1	70.11	58.65	35	45	80	13	sy7.1	47.08	72.23	45	55	100
5	sy7.2	97.87	42.29	35	45	80	14	sy7.2	33.74	80.10	45	55	100
6	sy7.3	111.37	34.33	35	45	80	15	sy7.3	51.33	69.73	45	55	100
7	sy9.1	50.65	70.13	40	50	90	16	sy9.1	31.74	81.28	50	50	100
8	sy9.2	110.72	34.71	40	50	90	17	sy9.2	21.35	87.41	50	50	100
9	sy9.3	35.55	79.04	40	50	90	18	sy9.3	11.02	93.50	50	50	100

Table 2 Uniaxial compressive strength of rock mass

序号	试件	单轴抗压强度	强度折减比	角度/（°）			序号	试件	单轴抗压强度	强度折减比	角度/（°）
序号	试件	$M P a$	%	$θ 1$	$θ 2$	$θ T$	序号	试件	$M P a$	%	$θ 1$	$θ 2$	$θ T$
1	sy2.1	118.08	30.37	30	50	80	10	sy2.1	102.12	39.78	44	45	90
2	sy2.2	121.60	28.29	30	50	80	11	sy2.2	75.34	55.57	45	45	90
3	sy2.3	113.34	33.17	30	50	80	12	sy2.3	37.13	78.10	45	45	90
4	sy7.1	70.11	58.65	35	45	80	13	sy7.1	47.08	72.23	45	55	100
5	sy7.2	97.87	42.29	35	45	80	14	sy7.2	33.74	80.10	45	55	100
6	sy7.3	111.37	34.33	35	45	80	15	sy7.3	51.33	69.73	45	55	100
7	sy9.1	50.65	70.13	40	50	90	16	sy9.1	31.74	81.28	50	50	100
8	sy9.2	110.72	34.71	40	50	90	17	sy9.2	21.35	87.41	50	50	100
9	sy9.3	35.55	79.04	40	50	90	18	sy9.3	11.02	93.50	50	50	100

Fig.6 Relationship between failure mode, compressive strength and joint angle

Fig.7 Relationship between joint angle and peak strength

Fig. 8 Evolution process of deformation field under overall failure mode （sy2.3）

Fig. 9 Evolution process of deformation field under ejection failure mode （sy9.1）

Fig. 10 Evolution process of deformation field under failure mode along main joint （sy6.2）

Fig. 11 Temporal and spatial distribution of overall failure AE events（sy2.3）（a）—0~0.25 σ；（b）—0.25~0.5 σ；（c）—0.5~0.75 σ；（d）—0.75~1 σ；（e）—0~1 σ.

Fig. 12 Temporal and spatial distribution of ejection failure AE events（sy9.1）

Fig. 13 Temporal and spatial distribution of along the main joint failure AE events （sy6.2）

Fig.14 Cloud chart of rock energy density

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