不同地应力下爆破振动效应分析

李萧翰; 刘科伟; 杨家彩; 李旭东

doi:10.11872/j.issn.1005-2518.2019.02.241

黄金科学技术 >

2019 , Vol. 27 >Issue 2: 241 - 248

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.02.241

采选技术与矿山管理

不同地应力下爆破振动效应分析

李萧翰 ,
刘科伟 ,
杨家彩 ,
李旭东

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中南大学资源与安全工程学院，湖南长沙 410083

李萧翰（1993-），男，山东济宁人，硕士研究生，从事矿山开采及爆破方面的研究工作。lixiaohan@csu.edu.cn

刘科伟（1982-），男，河北承德人，副教授，从事矿山、岩土工程灾害预测、稳定性及可靠性分析方面的研究工作。kewei_liu@126.com

收稿日期: 2018-02-04

修回日期: 2018-04-04

网络出版日期: 2019-04-30

基金资助

中南大学中央高校基本科研业务费专项资金“基于LS-DYNA的岩体爆破损伤研究”（编号：2017zzts789）、“不同埋深条件下地应力对巷道爆破开挖影响的数值模拟研究”（编号：2017zzts802）和湖南省自然科学基金项目“爆炸荷载下应力波空间变化特性与结构响应机理研究”(编号：2018JJ3656)

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Analysis of Blasting Vibration Effects Under Different Ground Stress

Xiaohan LI ,
Kewei LIU ,
Jiacai YANG ,
Xudong LI

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School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China

Received date: 2018-02-04

Revised date: 2018-04-04

Online published: 2019-04-30

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本文亮点

为研究岩石在不同地应力下的爆破振动效应，选择经验证过的岩石本构，利用ANSYS/LS-DYNA隐式—显式序列求解方法，对不同侧压力系数下岩石爆破过程进行数值分析。分别构建了侧压力系数为0.1、0.5、1.0、2.0、4.0条件下的计算模型，数值模拟结果表明：初始地应力对爆破有较强的抑制作用，岩石破碎区受侧压力系数的影响较小，爆破裂纹优先向较大的地应力方向延伸；岩石质点振动速度峰值（PPV）到达时间不受侧压力系数的影响；当侧压力系数小于1.0时，水平方向的质点振动速度峰值大于竖直方向;当侧压力系数大于1.0时，竖直方向的质点振动速度峰值大于水平方向。

本文引用格式

李萧翰 , 刘科伟 , 杨家彩 , 李旭东 . 不同地应力下爆破振动效应分析[J]. 黄金科学技术, 2019 , 27(2) : 241 -248 . DOI: 10.11872/j.issn.1005-2518.2019.02.241

Highlights

As the depth of mining, tunnel excavation, etc. continues to increase, high ground stresses appear in the interior of the rock mass. High ground stress will have a great impact on the blasting effect of rock mass. In order to study the blasting vibration effects on rock mass under different ground stresses, the finite element software ANSYS/LS-DYNA is applied to simulate the propagation of stress wave in rock mass under high ground stress.The influence of blasting on the surrounding rock mass under different ground stresses is analyzed, and the effects of different ground stresses on the blasting effect is finally obtained.A constitutive model of rock mass is selected and calibrated.Then applying implicit-explicit method, the dynamic explicit software ANSYS/LS-DYNA is used to model the blasting process of rock mass under different lateral pressure coefficients. Numerical models are built under condition that lateral pressure coefficients are 0.1, 0.5, 1.0, 2.0 and 4.0,respectively. Numerical simulation results indicate that high ground stress inhibits the blasting effects of rock mass and resists the damage extension around the blast hole. The lateral pressure coefficient has less influence on the fracture zone of rock mass, but has a greater influence on the crack zone of rock mass. And cracks will extend to the direction of higher ground stress more easily. Before the peak vibration velocity reaches its peak point, the rising time of peak particle velocity （PPV） is not influenced by lateral pressure coefficients. PPV in horizontal direction is greater than that of vertical direction when the lateral pressure coefficient is less than 1.0, while PPV in vertical direction is greater than that of horizontal direction when the lateral pressure coefficient is more than 1.0. This research can not only be used to evaluate the stability of deep rock mass structure under blasting load, but also can correctly guide blasting operation in engineering practice. More importantly, applying numerical simulation to analyze rock mass damage under blasting load can provide a reference experience for the in-depth study of the damage mechanism of rock mass under high strain rate dynamic loads.

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