夹层材料对软硬介质组合岩体动态力学特性的影响

王雁冰; 宋佳辉; 任斌; 刘珍; 龙永东

doi:10.11883/bzycj-2023-0022

夹层材料对软硬介质组合岩体动态力学特性的影响

doi: 10.11883/bzycj-2023-0022

王雁冰^{1, 2,},
宋佳辉¹,
任斌¹,
刘珍¹,
龙永东¹

1.
中国矿业大学（北京）力学与建筑工程学院，北京 100083
2.
中国矿业大学深部岩土力学与地下工程国家重点实验室，北京 100083

基金项目: 国家重点研发计划（2021YFC2902103）；国家自然科学基金（51934001）；中央高校基本科研业务费专项资金（2023JCCXLJ02）

详细信息

作者简介:
王雁冰（1987－　），男，博士，副教授，wangyanbing@cumtb.edu.cn

中图分类号: O383
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- 被引次数: 0
出版历程
- 收稿日期: 2023-01-30
- 修回日期: 2023-08-08
- 网络出版日期: 2023-08-10
- 刊出日期: 2023-12-12

Effect of interlayer material on dynamic mechanical properties of rock mass with combined hard and soft media

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.
State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

摘要

摘要: 为研究不同夹层材料下软硬介质组合岩体的动态力学性能及变形破坏特征，以砂岩和花岗岩为软硬岩基质，利用分离式霍普金森压杆(split Hopkinson pressure bar，SHPB)装置，并通过离散格子弹簧法(discrete lattice spring method，DLSM)数值模拟，探究了不同夹层材料下岩体裂纹扩展、夹层界面处的反、透射特性及岩体中能量分配特性。结果表明：不同夹层材料岩体的动态强度增长因子随着岩体动态抗压强度增大而增大，表现出明显的动态抗压强度依赖性。不同夹层材料岩体在加载初始阶段存在明显的非线性段，无夹层岩体砂岩内部闭合的孔隙及裂隙在应力开始作用阶段最久且非线性段最长。随着夹层材料强度的增大，夹层对岩体的裂纹扩展和发育的阻碍能力逐渐较弱，岩体产生裂纹和破坏需要消耗的能量逐渐降低。夹层岩体的破坏开始于夹层胶结面处，随着夹层材料强度的增大，软岩靠近胶结面一侧破坏逐渐加剧，硬岩无明显破坏。含夹层岩体具有很好的削波作用，随着夹层材料强度的降低，两端面应力峰值在逐渐降低，夹层岩体短时间内获得的能量吸收密度增大，稳定性降低，容易被破坏。
- 夹层材料岩体 /
- 裂纹扩展 /
- SHPB /
- 离散格子弹簧法
Abstract: A split Hopkinson pressure bar (SHPB) device was used to study the dynamic mechanical properties and deformation and failure characteristics of the rock mass combined with different sandwich materials, using sandstone and granite as the soft and hard rock matrix. The discrete lattice spring method (DLSM) was used to further investigate the crack propagation, the reaction and transmission at the interlayer interface and the energy distribution characteristics of rock mass combined with different interlayer materials. The results show that the growth factor of rock mass dynamic strength increases with the increase of rock mass dynamic compressive strength, showing an obvious dynamic compressive strength dependence. The rock mass combined with different interlayer materials has a obvious nonlinear section in the initial loading stage, and the closed pores and cracks in the sandstone of non-interlayer rock have the longest nonlinear section in the initial stress stage. With the increase of the strength of interlayer material, the obstacle ability of interlayer to crack propagation and development of rock mass gradually becomes weak, and the energy consumption of rock mass crack and failure is gradually reduced. The failure of the intercalated rock mass starts at the cementation surface of the intercalated rock mass. With the increase of the strength of the intercalated material, the failure of the soft rock near the cementation surface is gradually intensified, while the hard rock has no obvious failure. The rock mass with interlayer has a good clipping effect. With the decrease of the strength of interlayer material, the peak stress value of both ends gradually increases and decreases, whilst the energy absorption density of the interlayer rock mass increases in a short time, and the stability becomes worse, so it is easy to be destroyed.
- intercalated rock mass /
- crack propagation /
- SHPB /
- discrete lattice spring method

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图 1 不同夹层材料的软硬介质组合岩体设计（单位：mm）

Figure 1. Rock mass designs of hard and soft media combination with different sandwich materials (unit in mm)

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图 2 SHPB试验系统

Figure 2. SHPB test system diagram

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图 3 试件两端动态应力平衡曲线

Figure 3. Dynamic stress balance curves at both ends of specimen

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图 4 不同夹层材料岩体动态强度增长因子随动态抗压强度变化

Figure 4. Relation between dynamic strength increase factor and dynamic compressive strength of rock mass with different sandwich materials

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图 5 不同组合岩体夹层材料的应力-应变曲线

Figure 5. Stress-strain curves of interlayer materials of different composite rock masses

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图 6 不同夹层材料岩体的破坏形态

Figure 6. Failure patterns of rock masses with different interlayer materials

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图 7 组合岩体模型

Figure 7. Combined rock mass models

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图 8 不同夹层材料岩体的裂纹扩展过程

Figure 8. Crack propagation processes of rock masses with different sandwich materials

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图 9 不同夹层材料岩体测点处的应力-时间曲线

Figure 9. Stress-time curves of rock masses with different sandwich materials

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图 10 不同夹层材料岩体能量吸收密度比较曲线

Figure 10. Comparisons of energy absorption densities of rock masses with different sandwich materials

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表 1 岩石基本物理力学参数

Table 1. Basic physical and mechanical parameters of rock

岩石种类	密度/（g·cm⁻³）	波速/（m·s⁻¹）	波阻抗/（kg·m⁻²·s⁻¹）	单轴抗压强度/MPa	普氏系数
砂岩	2.48	3350	8308	38.5	3.85
花岗岩	2.63	5415	14241	146.0	14.60

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表 2 夹层材料基本物理力学参数

Table 2. Basic physical and mechanical parameters of sandwich material

材料类别	密度/（g·cm⁻³）	抗压强度/MPa	弹性模量/GPa	泊松比	内聚力/MPa
A材料	1.73	14.5	19.6	0.3	13.9
B材料	1.84	26.9	26.4	0.32	17.2
石膏	1.06	2.5	0.96	0.25	-

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表 3 不同夹层材料岩体的峰值强度

Table 3. Peak strength of rock mass with different interlayer materials

试件编号	夹层材料	加载气压/MPa	冲击速度/(m·s⁻¹)	动态抗压强度/MPa	平均值/MPa
WJC-1	无	0.33	8.832	64.60	64.56
0.33	无	WJC-2	9.171	64.52	64.56
JCA-1	A材料	0.33	8.754	47.84	47.63
0.33	A材料	JCA-2	9.130	47.42	47.63
JCB-1	B材料	0.33	8.731	58.85	58.24
0.33	B材料	JCB-2	8.457	57.63	58.24
JCS-1	石膏	0.33	8.735	33.13	33.47
JCS-2	石膏	0.33	9.256	33.81	33.47

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表 4 不同夹层材料岩体的能耗

Table 4. Energy consumption of rock mass with different sandwich materials

夹层材料	夹层厚度/mm	试件编号	入射能E_i/J		反射能E_r/J		透射能E_t/J		耗散能E_d/J		碎块质量/g
夹层材料	夹层厚度/mm	试件编号	试验值	平均值	试验值	平均值	试验值	平均值	试验值	平均值	试验值	平均值
无夹层	10	WJC-1	364.26	364.21	95.62	96.01	126.77	127.86	138.31	140.34	196.68	188.75
无夹层	10	WJC-2	364.16	364.21	96.40	96.01	129.01	127.86	142.37	140.34	180.82	188.75
A材料	10	JCA-1	363.34	365.43	151.28	151.52	68.10	67.20	139.80	146.71	57.54	57.06
A材料	10	JCA-2	367.52	365.43	151.76	151.52	66.30	67.20	153.62	146.71	56.58	57.06
B材料	10	JCB-1	365.02	364.70	124.44	122.13	101.08	99.35	139.50	143.22	137.81	135.56
B材料	10	JCB-2	364.38	364.70	119.82	122.13	97.62	99.35	146.94	143.22	133.31	135.56
石膏	10	JCS-1	367.70	364.86	172.00	176.40	35.29	33.09	156.66	155.37	13.29	14.85
石膏	10	JCS-2	362.02	364.86	180.80	176.40	30.89	33.09	154.08	155.37	16.41	14.85

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