致密砂岩巷道模型试件动态起裂及止裂全过程分析

周磊; 朱哲明; 王蒙; 周昌林; 董玉清; 应鹏

doi:10.11883/bzycj-2018-0073

致密砂岩巷道模型试件动态起裂及止裂全过程分析

doi: 10.11883/bzycj-2018-0073

四川大学建筑与环境学院深地科学与工程教育部重点实验室，四川成都 610065

基金项目: 国家自然科学基金资助项目（11672194）；四川省科技计划项目（2018JZ0036）；四川省安全监管局安全生产科技项目（aj20170515161307）

详细信息

作者简介:
周　磊（1990－　），男，博士，现任助理研究员，zhouleittkx@126.com

通讯作者:
朱哲明（1965－　），男，教授，博士，博士生导师，zhemingzhu@hotmail.com

中图分类号: O389
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- 被引次数: 0
出版历程
- 收稿日期: 2018-03-09
- 修回日期: 2018-05-09
- 网络出版日期: 2019-08-25
- 刊出日期: 2019-09-01

Analysis on whole dynamical fracture process of tight sandstone tunnel model under impact loading

MOE Key Laboratory of Deep Underground Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China

摘要

摘要: 为了开展在不同冲击载荷作用下巷道围岩内裂纹的起裂、扩展及止裂等问题，以可调速冲击试验机进行动态加载试验，采用致密青砂岩制作裂纹巷道模型试件，并利用裂纹扩展计分别记录了动态起裂、扩展、止裂等时刻，对裂纹扩展速度的变化规律进行分析；随后采用AUTODYN有限差分法软件进行相应的数值模拟，数值模拟得到的裂纹扩展路径与试验结果基本一致。经过两者对比分析可知：随着冲击载荷作用的增加，裂纹平均扩展速度逐渐增大，随后趋于稳定值；预制裂纹的起裂时间随着冲击速度载荷的增加而逐渐降低，并在稳定值上下波动；随着冲击速度载荷的增加，裂纹扩展路径过程中的止裂时段逐渐变短。
- 巷道 /
- 冲击载荷 /
- 裂纹扩展速度 /
- 起裂时间 /
- 止裂时间
Abstract: In order to investigate the properties of crack fracture time, propagation speed and arrest period in the surrounding rock of tunnel under different impact loading speed, the dynamic tests were performed by self-developed adjustable speed drop weight impact test system, and the tight green sandstone was selected to make the cracked tunnel specimens. A crack propagation gauge (CPG) was applied to measure dynamic initiation time, propagation speeds and arrest time, respectively. The properties of crack propagation velocity, crack fracture time and crack arrest period were discussed and analyzed. The corresponding numerical simulation was carried out by AUTODYN code, and the simulation results showed that the crack propagation speeds and crack fracture time generally agree with the experimental results, and crack arrest period also was calculated. The results show that crack propagation speeds increase with impact loading speed, but as the impact loading speed is larger than a certain value, the crack speeds tend toward a stable value; Crack fracture time decreases with the increase of impact loading speed, and as the loading rate is larger than a certain value, it tends toward a stable value; With the increase of the impact loading speed, the crack arrest period in the crack propagation path gradually decreases.
- tunnel /
- impact loading /
- crack propagation speeds /
- crack fracture time /
- crack arrest time

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图 1 巷道模型示意图(单位：mm)

Figure 1. Sketch map of tunnel model (unit: mm)

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图 2 数值模型网格单元示意图

Figure 2. Sketch map of numerical model mesh unit

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图 3 数值模拟结果分析

Figure 3. Numerical simulation results

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图 4 高斯点的应力时程曲线

Figure 4. Normal stress time curves of Gauss point

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图 5 裂纹扩展特性曲线

Figure 5. Curves of crack propagation properties

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图 6 裂纹平均扩展速度与起裂时间趋势线

Figure 6. The trendline of crack average propagation velocity and initiation time

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图 7 裂纹止裂区间趋势线

Figure 7. The trendline of crack arrest period

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图 8 试验装置

Figure 8. Test device

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图 9 冲载载荷

Figure 9. Impact loading force

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图 10 CPG示意图

Figure 10. Sketch map of CPG

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图 11 CPG 测试数据分析

Figure 11. Analysis of CPG test data

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图 12 试验测试裂纹平均扩展速度与起裂时间结果值

Figure 12. Test results of crack average propagation speed and initiation time

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表 1 砂岩及杆件材料参数

Table 1. Material parameters of sandstone and LY12CZ

材料	ρ/(kg∙m⁻³)	σ_c/(MPa)	σ_t/(MPa)	K_IC/(MPa∙m^1/2)	E_d/(GPa)	ν_d	c_d/(m·s⁻¹)	c_s/(m·s⁻¹)	c_R/(m·s⁻¹)
LY12CZ	2850				71.7	0.3	5006
砂岩	2265	22.08	1.08	0.468	13.58	0.164	2563	1639	1479.9
注：ρ为密度，σ_c为单轴抗压强度，σ_t为单轴抗拉强度，K_IC为静态断裂韧度，E_d为弹性模量，ν_d为泊松比，c_d为纵波波速，c_s为横波波速，c_R为瑞雷　　波波速.

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表 2 CPG测试结果

Table 2. CPG test results

试件编号	v/(m∙s⁻¹)	t_i/μs	v_a/(m∙s⁻¹)	试件编号	v/(m∙s⁻¹)	t_i/μs	v_a/(m∙s⁻¹)
1	1.939	315	177.957	9	5.903	277	598.180
2	2.435	307	224.744	10	6.398	274	613.668
3	2.930	305	239.419	11	6.893	265	628.571
4	3.425	282	301.829	12	7.389	261	647.059
5	3.921	275	443.548	13	7.884	255	659.176
6	4.578	279	458.881	14	8.380	262	672.780
7	4.912	274	486.189	15	8.683	257	674.386
8	5.407	266	574.912

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