循环冲击载荷作用下页岩动力学响应及能量耗散特征

王宇; 翟成; 唐伟; 石克龙

doi:10.11883/bzycj-2022-0248

循环冲击载荷作用下页岩动力学响应及能量耗散特征

doi: 10.11883/bzycj-2022-0248

王宇^{1, 2,},
翟成^{1, 2, ,},
唐伟^{1, 2},
石克龙^{1, 2}

1.
中国矿业大学安全工程学院，江苏徐州 221116
2.
中国矿业大学煤矿瓦斯治理国家工程研究中心，江苏徐州 221116

基金项目: 国家重点研发计划（2020YFA0711800）

详细信息

作者简介:
王　宇（1999－　），男，博士研究生，tb21120024b1@cumt.edu.cn

通讯作者:
翟　成（1978－　），男，博士，教授，greatzc@126.com

中图分类号: O341
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-07
- 修回日期: 2022-09-13
- 网络出版日期: 2022-09-14
- 刊出日期: 2023-06-05

Dynamic response and energy dissipating characteristics of shale under cyclic impact loadings

WANG Yu^{1, 2
,},
ZHAI Cheng^{1, 2
, ,},
TANG Wei^{1, 2},
SHI Kelong^{1, 2}

1.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2.
National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

摘要

摘要: 采用$\varnothing $50 mm分离式霍普金森杆(split Hopkinson pressure bar，SHPB)实验系统开展页岩循环冲击实验，研究不同循环冲击载荷作用下页岩动力学响应及损伤演化特征，同时揭示了控制入射总能量不变条件下，不同气压梯度循环冲击页岩能量演化规律。随着冲击气压升高，试样破裂所需的冲击次数呈线性减少，峰值应力随循环冲击次数的增加先升高后降低，极限应变先减小后增大，试样在循环冲击下表现出先压密后损伤的力学机制。基于Weibull分布的统计损伤模型表明，升高循环冲击气压，试样损伤破坏形式由缓慢劣化逐渐转变为骤然破坏。入射总能量恒定的情况下，通过控制循环入射能量梯度能够产生不同的损伤效果，降压冲击和升压冲击下的能量吸收比均大于恒压冲击下的，且气压梯度的绝对值与能量吸收比呈现正相关性。
- 页岩 /
- SHPB实验 /
- 循环冲击 /
- 损伤演化
Abstract: The formation of complex fracture networks in the shale subjected to cyclic impact loading is an important scientific problem for water-free fracturing technologies of shale reservoirs, such as explosive fracturing and high-energy gas fracturing. Two cyclic impact experiments based on a split Hopkinson pressure bar (SHPB) system were conducted on the freshly exposed black mud shale taken from the Wufeng Formation-Longmaxi Formation in Changning County, Sichuan Province, to investigate the kinetic response and damage evolution characteristics of the shale under different cyclic impact gas pressure and different cyclic impact gas pressure gradients, respectively, and to reveal the energy evolution law of the cyclic impact shale using different impact gas pressure gradients under the condition of controlling the constant total incident energy. The main conclusions are as follows. With the increase in impact pressure, the number of impacts required to rupture the specimen decreases, and the fragmentation and peak stress increase. The specimen undergoes cyclic impact showing the mechanical response characteristics of compaction first and then gradual damage. The damage degree of the shale specimens during cyclic impact was calculated by a dynamic damage model based on the Weibull distribution, and the results show that the damage of the specimen gradually changes from slow deterioration to sudden damage by increasing the cyclic impact pressure. Different cyclic impact experiments with different impact gas pressure gradients were conducted. The results show that under the condition of constant total incident energy, different cyclic incident energy gradients could produce different damage effects, and the energy absorption ratio of the negative or positive gas pressure gradient of cycle impact is greater than that of the zero ones. The absolute value of the pressure gradient shows a positive correlation with the energy absorption ratio. It indicates that under the condition of constant total impact energy, increasing the absolute value of the cyclic impact gradient can produce a better damage effect. The findings of the shale cyclic impact experiments can provide theoretical support for the technological design of multi-stage pulsed high-energy-gas-fracturing.
- shale /
- SHPB experiment /
- cyclic dynamic loading /
- damage evolution

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图 1 取样位置及试样制备

Figure 1. Sampling location and specimen preparation

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图 2 围压SHPB实验系统

Figure 2. SHPB experimental system with confining pressure

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图 3 不同冲击气压页岩破坏形态

Figure 3. Failure modes of shale under different impact air pressures

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图 4 冲击气压-循环冲击次数统计图

Figure 4. Relationship between impact pressure and critical cycle impact times

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图 5 不同冲击气压循环冲击页岩应力-应变曲线

Figure 5. Variation of stress-strain curves of shale with times of cyclic impact under different impact air pressures

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图 6 一次冲击破坏试样应力-应变曲线及应变损伤曲线

Figure 6. Stress-strain curves and damage-strain curves of specimens failed after a single impact

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图 7 试样5-1循环冲击应力-应变曲线及应变损伤曲线

Figure 7. Stress-strain and damage-strain curves of specimen 5-1 under cyclic impact

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图 8 不同载荷下试样损伤随循环冲击次数变化曲线

Figure 8. Variation of specimen damage with cyclic impact times under different loads

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图 9 各试样循环冲击总入射能统计柱状图

Figure 9. Statistical histogram of total incident energy of cyclic impact for each rock specimen

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图 10 不同冲击气压梯度循环冲击页岩应力-应变曲线

Figure 10. Variation of stress-strain curves of shale under different impact air pressure gradients

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图 11 能量吸收比随循环冲击次数的变化曲线

Figure 11. Relationship between the nergy absorption ratios and the times of cyclic impact

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图 12 各页岩试样能量吸收比统计图

Figure 12. Statistical chart of energy absorption ratios of shale specimens

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表 1 页岩试样基本物理力学参数

Table 1. Basic physical and mechanical parameters of the shale specimens

密度/(kg·m⁻³)	层理/(°)	纵波波速/(m·s⁻¹)	抗压强度/MPa	弹性模量/GPa	泊松比	抗拉强度/MPa
2619	0	4163	156	4.790	0.2	5.500

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表 2 恒压冲击实验设计

Table 2. Design of constant pressure impact experiments

循环冲击气压/MPa	试样
0.4	1-1, 1-2, 1-3
0.6	2-1, 2-2, 2-3
0.8	3-1, 3-2, 3-3
1.0	4-1, 4-2, 4-3
1.2	5-1, 5-2, 5-3

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表 3 不同气压梯度循环冲击实验设计

Table 3. Design of variable-pressure impact experiments

冲击气压梯度布置	试样	气压梯度/MPa
1.0 MPa→0.9 MPa→0.8 MPa→ 0.7 MPa→0.6 MPa	6-1, 6-2, 6-3	−0.1 MPa
1.2 MPa→1.0 MPa→0.8 MPa→ 0.6 MPa→0.4 MPa	7-1, 7-2, 7-3	−0.2 MPa
0.6 MPa→0.7 MPa→0.8 MPa→ 0.9 MPa→1.0 MPa	8-1, 8-2, 8-3	0.1 MPa
0.4 MPa→0.6 MPa→0.8 MPa→ 1.0 MPa→1.2 MPa	9-1, 9-2, 9-3	0.2 MPa
0.8 MPa→0.8 MPa→0.8 MPa→ 0.8 MPa→0.8 MPa	10-1, 10-2, 10-3	0 MPa

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