频繁动力扰动对围压卸载中高储能岩体的动力学影响

唐礼忠; 刘昌; 王春; 陈英毅; 申帆

doi:10.11883/bzycj-2018-0137

频繁动力扰动对围压卸载中高储能岩体的动力学影响

doi: 10.11883/bzycj-2018-0137

1.
中南大学资源与安全工程学院，湖南长沙 410083
2.
河南理工大学能源科学与工程学院，河南焦作 454000

基金项目: 国家自然科学基金（51474250）；中央高校基本科研业务费专项（2018zzts721，2018zzts212）；河南省高校重点科研（18A440014）；河南理工大学博士基金（672707）

详细信息

作者简介:
唐礼忠（1963－　），男，博士，教授，lztang11@csu.edu.cn

中图分类号: O347.3; TU452
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- 被引次数: 0
出版历程
- 收稿日期: 2018-04-24
- 修回日期: 2018-10-11
- 刊出日期: 2019-06-01

Dynamic influence of frequent dynamic disturbance on high-energy rock mass during confining pressure unloading

1.
School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
2.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

摘要

摘要: 基于冬瓜山铜矿深部巷道围岩开挖过程中面临的高应力和频繁爆破扰动问题，利用改进的SHPB动静组合加载系统，开展了频繁动力扰动对围压卸载中高储能岩体动力学影响的研究。研究结果表明，围压卸载中的矽卡岩受到动力扰动时，其动态峰值应力和弹性模量随动力扰动次数非线性变化。围压卸载中的高储能矽卡岩受到动力扰动时会释放能量。轴压促使岩样内微裂隙轴向发育，造成岩样抵抗动力扰动能力减弱；围压减缓岩样内微裂隙轴向发育，造成岩样抵抗动力扰动能力增强。动力扰动对微裂隙扩展有促进作用，使围压卸载中的岩样由拉伸破坏向剪切破坏转变。
- 循环冲击 /
- 围压卸荷 /
- 能量耗散 /
- 变形特征 /
- 破坏模式
Abstract: In this study, based on the high stress and frequent blast disturbance in the process of surrounding rock excavation in the deep roadway of Dongguashan Copper Mine, we investigated the dynamic properties of the high-energy rock mass disturbed by frequent dynamic loading during confining pressure unloading, using the modified SHPB coupled static-dynamic loading system. The results show that the peak dynamic stress and elastic modulus of the skarn subjected to confining pressure unloading varied nonlinearly with the number of dynamic disturbances, and the high energy skarn in confining pressure unloading released energy when subjected to dynamic disturbance. The axial pressure promoted the axial development of micro-fissures in the rock specimens, resulting in a lower capacity of rock samples. However, the confining pressure restrained the axial development of micro-fissures in the rock sample, resulting in a higher capacity of rock samples. The dynamic disturbance promoted the micro-fracture expansion, transforming the rock sample in confining pressure from tensile failure to shear failure.
- cyclic impact /
- confining pressure unloading /
- energy dissipation /
- deformation characteristics /
- failure mode

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图 1 动静组合系统结构示意图

Figure 1. Structural diagram of dynamic and static combination system

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图 2 频繁扰动下矽卡岩动态应力应变曲线

Figure 2. Dynamic stress-strain curves of skarn under frequent disturbances

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图 3 动态峰值应力与冲击次数的关系

Figure 3. Relationship between peak dynamic stress and impact times

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图 4 切线弹性模量与冲击次数的关系

Figure 4. Relationship between tangent elastic modulus and number of impacts

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图 5 岩样体积能耗与冲击次数的关系

Figure 5. Relationship between energy consumption per unit volume of rock and number of impacts

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图 6 矽卡岩最终破坏形态

Figure 6. Final destruction modes of skarn

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表 1 实验方案

Table 1. Experimental plan

岩样	预加轴压 /MPa	预加围压 /MPa	冲击时围压 /MPa	围压卸载速率 /(MPa·s⁻¹)	冲击气压 /MPa
XK1-1	62.5	15	7.5	1	0.6
XK1-2	62.5	20	10	1	0.6
XK2-1	72.5	15	7.5	1	0.6
XK2-2	72.5	20	10	1	0.6
XK3-1	82.5	15	7.5	1	0.6
XK3-2	82.5	20	10	1	0.6

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表 2 矽卡岩三轴压缩实验结果

Table 2. Triaxial compression experimental results for skarn

围压 /MPa	弹性模量 /GPa	三轴抗压强度 /MPa	峰值应变 /10⁻³	黏结力 /MPa	内摩擦角 /（°）
15	26.81	217.93	10.27	6.86	57
20	32.69	237.87	12.29	6.86	57

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表 3 冲击次数统计表

Table 3. Summary of impacts

岩样	预加轴压/ MPa	预加围压/ MPa	冲击时围压/ MPa	冲击次数
XK1-1	62.5	15	7.5	35
XK1-2	62.5	20	10	36
XK2-1	72.5	15	7.5	21
XK2-2	72.5	20	10	31
XK3-1	82.5	15	7.5	13
XK3-2	82.5	20	10	21

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