| 爆炸荷载作用下围岩累积损伤效应的数值分析 |
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| 引用本文： | 潘城,赵光明,孟祥瑞. 爆炸荷载作用下围岩累积损伤效应的数值分析[J]. 爆破, 2016, 33(1). DOI: 10.3963/j.issn.1001-487X.2016.01.006 |
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| 作者姓名： | 潘城 赵光明 孟祥瑞 |
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| 作者单位： | 安徽理工大学能源与安全学院,淮南,232001;安徽理工大学能源与安全学院,淮南,232001;安徽理工大学能源与安全学院,淮南,232001 |
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| 基金项目： | 国家自然科学基金资助项目(51174005、51374013、51274008、51134012)；高等学校博士学科点专项科研基金(20133415110006、20123415130001)；霍英东青年教师基金基础性研究资助课题(121050)；安徽高校省级自然科学研究重点项目Kj2011A085；安徽省学术和技术带头人及后备人选科研活动经费项目(DG073) |
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| 摘 要： | 巷道爆破开挖推进过程中,循环爆破开挖的多次扰动作用使保留岩体产生累积损伤,导致岩体力学参数的弱化,从而造成工程岩体的宏观失效。利用ANSYS/LS-DYNA的重启动技术,通过损伤云图和损伤变量D的变化,对圆形巷道循环进尺过程中爆破作用下的岩体累积损伤效应进行研究。计算结果表明:随着掌子面推进爆破次数的增加,围岩的损伤程度加深,但影响深度变化较小;在装药量和爆心距不变的情况下,损伤量与爆破次数之间有很好的非线性关系,即爆破损伤的累积具有非线性特性。
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| 关 键 词： | 爆炸力学 累积损伤 围岩 数值分析 |
Numerical Analysis of Surrounding Rock Cumulative Damage under Explosion Loading |
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| PAN Cheng,ZHAO Guang-ming,MENG Xiang-rui. Numerical Analysis of Surrounding Rock Cumulative Damage under Explosion Loading[J]. Blasting, 2016, 33(1). DOI: 10.3963/j.issn.1001-487X.2016.01.006 |
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| Authors: | PAN Cheng ZHAO Guang-ming MENG Xiang-rui |
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| Abstract: | During excavation of tunnel works with drilling and blasting method,the multiple disturbance effect al-ways makes damage to the remaining rock mass,which weakens the rock mass mechanics parameters and the macro failure of engineering rock mass. The ANSYS/LS-DYNA was utilized through the change of damage nephogram and the amount of damage D,the evolution process of rock damage under frequent explosions was studied. Results show that, with the increasing number of blasting,the damage degree on surrounding rock got enhanced,but the influence depth became smaller. On the condition of constant charge weight and blast center distance,the damage and blasting times show good nonlinear relation characteristic. |
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| Keywords: | explosion mechanics cumulative damage surrounding rock numerical simulation |
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