冻融循环对含纯Ⅰ型裂隙围岩的动态起裂特性影响规律

姜亚成; 周磊; 朱哲明; 李剑飞; 牛草原; 应鹏

doi:10.11883/bzycj-2020-0330

冻融循环对含纯Ⅰ型裂隙围岩的动态起裂特性影响规律

doi: 10.11883/bzycj-2020-0330

姜亚成^{1, 2,},
周磊^{1, 2, ,},
朱哲明^{1, 2},
李剑飞^{1, 2},
牛草原^{1, 2},
应鹏^{1, 2}

1.
四川大学建筑与环境学院，四川成都 610065
2.
四川大学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（U19A2098，11672194，11702181）；深地科学与工程教育部重点实验室（四川大学）开放基金（DESE202005）

详细信息

作者简介:
姜亚成（1994－　），男，硕士研究生，jiangyc210@163.com

通讯作者:
周　磊（1990－　），男，博士，助理研究员，zhouleittkx@126.com

中图分类号: O389；TU45
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- 文章访问数: 407
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-21
- 修回日期: 2020-11-16
- 网络出版日期: 2021-04-14
- 刊出日期: 2021-04-14

Effects of freeze-thaw cycles on dynamic fracture initiation characteristics of surrounding rock with pure Ⅰ type fracture under impact loads

JIANG Yacheng^{1, 2
,},
ZHOU Lei^{1, 2
, ,},
ZHU Zheming^{1, 2},
LI Jianfei^{1, 2},
NIU Caoyuan^{1, 2},
YING Peng^{1, 2}

1.
College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China
2.
MOE Key Laboratory of Deep Underground Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 以寒区隧道为工程背景研究在冻融循环作用下围岩内Ⅰ型裂纹的动态起裂特性演化规律，采用隧道模型试件作为研究对象，开展冻融循环试验与大尺度落锤冲击试验，得到岩石试件经历不同冻融循环次数后的相关力学参数，并在裂纹尖端粘贴裂纹扩展计(crack propagation gauge, CPG)测量预制裂纹的动态起裂时间。采用有限元软件建立相应的数值模型计算裂纹尖端的动态应力强度因子，采用试验-数值法计算动态起裂韧度，随后采用电镜对冻融循环后的试样进行扫描，研究冻融循环对岩石材料的细观损伤机制。研究结果表明：随着冻融循环次数的增加，岩石材料的纵波、横波波速与弹性模量逐渐减小，而泊松比逐渐增大；砂岩材料的动态起裂韧度随着冻融循环次数的增加逐渐减小，表征线性反比例的特性；材料内部的胶结物质会由于冻融循环的影响而流失，材料的孔隙和裂纹也随着冻融循环次数的增加而变多变大。
- 冻融循环 /
- 隧道模型 /
- 动态起裂韧度 /
- 细观损伤机制
Abstract: In order to investigate the dynamic initiation and evolution of mode Ⅰ crack in surrounding rock under the action of freeze-thaw cycle, taking a cold area tunnel as the engineering background, the freeze-thaw cycle test and large-scale drop weight test were carried out by using tunnel model specimens that were made of green sandstone in Sichuan province. The dynamic mechanical characteristics of specimens after different freeze-thaw cycles were measured and discussed. The elastic modulus and Poisson’s ratio of the specimens were calculated by longitudinal wave velocity, shear wave velocity. The dynamic strain gauges were glued at the incident plate and transmitted plate to collect voltage signals. The voltage signal was applied to calculate the curves of dynamic loading versus time recorded from the incident plate and transmission plate. Crack initiation time was determined by using a crack propagation gauge (CPG) measuring system. A traditional finite element method code was applied to establish some numerical models to calculate the curves of dynamic stress intensity factor under impact loads. The experimental-numerical method was used to determine dynamic fracture initiation toughness according to crack initiation time. A scanning electron microscope (SEM) was applied to analyze the micro-structure of sandstone material after different freeze-thaw cycles, and the mesoscopic damage mechanism of rock materials was obtained. The test results show that the longitudinal wave velocity, shear wave velocity and elastic modulus of sandstone gradually decrease with the number of freeze-thaw cycles, while Poisson’s ratio increases with the number of freeze-thaw cycles. The crack initiation time and dynamic initiation toughness of rock material decrease with the number of the freeze-thaw cycles. The cement material inside the rock will loss due to the effect of freeze-thaw cycles, and the pores and micro-cracks of the sandstone also increase with the number of freeze-thaw cycles.
- freeze-thaw cycles /
- tunnel model /
- dynamic initiation toughness /
- mesoscopic damage mechanism

HTML全文

图 1 试件模型及尺寸示意图(单位：mm)

Figure 1. Sketch of specimen (unit: mm)

下载: 全尺寸图片幻灯片

图 2 高低温试验箱

Figure 2. High-low temperature test chamber

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图 3 试验装置示意图

Figure 3. Drop-weigh test system

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图 4 裂纹扩展计测试系统

Figure 4. CPG measuring system

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图 5 纵波波速与弹性模量变化曲线

Figure 5. Plots of P-wave velocity and elastic modulus

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图 6 入射端与透射端的脉冲信号曲线

Figure 6. Histories of the incident and transmitted plates

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图 7 动态载荷曲线

Figure 7. Histories of dynamic loads

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图 8 数值模型网格示意图

Figure 8. Sketch map of numerical model

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图 9 动态起裂韧度计算结果

Figure 9. Calculation results of dynamic initiation toughness

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图 10 冻融次数与动态起裂韧度的关系曲线

Figure 10. Relationship between freeze-thaw cycles and dynamic initiation toughness

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图 11 青砂岩的电镜扫描图

Figure 11. Scanning electron microscopes of sandstone

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表 1 5组试件材料的力学参数

Table 1. Mechanical parameters for five groups of specimen

冻融次数	孔隙率/%	泊松比	弹性模量/GPa	纵波波速/（m·s⁻¹）	横波波速/（m·s⁻¹）	纵波波速降/%	横波波速降/%
0	12.52	0.262	12.56	2 562	1 455	0	0
10	12.96	0.270	10.50	2 378	1 334	7.2	8.3
20	13.35	0.276	9.14	2 254	1 253	12.0	13.9
30	13.87	0.283	8.10	2 153	1 185	16.0	18.5
40	14.51	0.286	7.31	2 085	1 141	18.6	21.6

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表 2 冲击试验结果

Table 2. Impact test results

试件	冲击速度/（m·s⁻¹）	起裂时间/μs	动态起裂韧度/（MPa·m^1/2）	动态加载率/（MPa·m^1/2·s⁻¹）
0-1	6.56	362	3.09	10 404
0-2	6.59	374	3.29	10 716
0-3	6.61	367	3.18	10 603
10-1	6.48	375	2.87	9 410
10-2	6.53	371	2.77	9 082
10-3	6.48	366	2.66	8 866
20-1	6.57	381	2.54	8 274
20-2	6.51	389	2.75	8 730
20-3	6.56	386	2.66	8 445
30-1	6.52	393	2.41	7 670
30-2	6.56	397	2.51	7 952
30-3	6.59	390	2.31	7 549
40-1	6.56	395	2.11	6 762
40-2	6.50	392	2.04	6 623
40-3	6.47	399	2.21	7 015

下载: 导出CSV

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