露天矿地下采空区爆破崩落法治理效果的数值模拟研究
Numerical Simulation on Controlling Effect of Underground Goafs in Open Pit Mine by Blasting Caving Method
查看参考文献18篇
文摘
|
爆破崩落法是治理露天矿地下采空区的主要手段,数值模拟是研究爆破崩落效果的有效工具。基于连续-非连续数值模拟方法(CDEM),利用朗道点火爆炸模型实现了炸药起爆过程的描述,利用考虑应变软化效应的Mohr-Coulomb模型及最大拉应力模型实现了围岩损伤破裂过程的模拟。以弓长岭铁矿何家采场采空区为研究对象,重点探讨了炮孔间排距、起爆延时等对该采空区上覆岩层损伤破裂程度、空区填充程度及空区内大块率的影响规律。计算结果表明:炮孔间排距对爆破效果的影响较大,随着间排距的增大,塌落至空区的大块率逐渐增大,且塌落范围逐渐减小。当间排距为17 m时,仅空区顶板附近出现局部塌落,地表岩层依然处于稳定状态。起爆延时对爆破效果的影响较小,当起爆延时大于42 ms以后,塌落至空区的岩体块度分布基本一致,仅大块率有所区别。为了确保爆破崩落法的治理效果,建议炮孔的间排距不大于7 m,炮孔排间延时不小于42 ms。 |
其他语种文摘
|
Blasting caving is the main method to control the underground goafs in open pit mine, and the numerical simulation is an effective tool to study the blasting effect. Based on the Continuous Discontinues Element Method (CDEM), the Landau blasting model was adopted to describe the detonating process of explosives. The Mohr-Coulomb model and maximal tensile stress model considering strain softening effect are used to simulate the damage and fracture process of rocks. Based on the goafs in Hejia stope in Gongchangling iron mine, the damage and fragmentation degree, filling degree, and large block ratio in goaf affected by row-column spacing of bore holes and detonating delay is discussed. The numerical results show that the row-space of hole influence the blasting quality greatly. With the increment of spacing, the large block ratio in goaf increases gradually, and the collapse area decreases gradually. When the row-space of hole reaches 17m, local collapse just appears near the roof of goaf, and the surface of the rock layer is still stable. Detonating delay will not affect the blasting results so seriously. When delay time is greater than 42ms, the distribution of fragments in goaf is approximately the same, except the little difference in large block ratio. To ensure the control effect of blasting caving method, it's suggested that the row-space of hole should not be greater than 7m, and initiation delay should not be less than 42 ms. |
来源
|
爆破
,2017,34(4):57-65 【扩展库】
|
DOI
|
10.3963/j.issn.1001-487X.2017.04.011
|
关键词
|
采空区
;
爆破崩落法
;
数值模拟
;
间排距
;
起爆延时
|
地址
|
1.
鞍钢矿业爆破有限公司, 鞍山, 114046
2.
中国科学院力学研究所, 中国科学院流固耦合系统力学重点实验室, 北京, 100190
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
1001-487X |
学科
|
矿业工程 |
文献收藏号
|
CSCD:6138811
|
参考文献 共
18
共1页
|
1.
古德生.
现代金属矿床开采科学技术,2006
|
被引
58
次
|
|
|
|
2.
国家安全生产监督管理总局.
国家安全生产科技发展规划-非煤矿山领域研究报告(2004-2010),2003
|
被引
1
次
|
|
|
|
3.
Azapagic A. Developing a frame work for sustainable development indicators for the mining and minerals industry.
Journal of Cleaner production,2004(12):639-662
|
被引
21
次
|
|
|
|
4.
崔晓荣. 采空区采矿施工安全的组织与管理.
金属矿山,2011(11):150-154
|
被引
3
次
|
|
|
|
5.
李俊平. 采空场处理的研究进展.
中国钼业,2002,26(3):10-15
|
被引
5
次
|
|
|
|
6.
杨明春. 采空场处理综述.
矿业快报,2004,20(10):35-37
|
被引
1
次
|
|
|
|
7.
崔晓荣. 矿山采空区崩落爆破评估验收方法.
金属矿山,2015,44(9):11-15
|
被引
9
次
|
|
|
|
8.
梁超. 采空区顶板动力响应数值模拟研究.
中国锰业,2016,34(4):61-67
|
被引
2
次
|
|
|
|
9.
郭靖. 露天矿采空区台阶爆破数值模拟分析.
煤矿机械,2016,37(10):44-45
|
被引
2
次
|
|
|
|
10.
王汉军. 深部岩巷爆破机理分析和爆破参数设计.
煤炭学报,2007,32(4):373-376
|
被引
7
次
|
|
|
|
11.
叶海旺. 含夹层矿体分采过程的数值模拟研究.
爆破,2011,28(2):27-29
|
被引
1
次
|
|
|
|
12.
赵老生. 改善高韧性顶煤爆破效果的数值模拟.
辽宁工程技术大学学报(自然科学版),2010,29(1):17-19
|
被引
3
次
|
|
|
|
13.
齐世福. 水下钻孔爆破的数值模拟.
工程爆破,2010,16(4):13-17
|
被引
9
次
|
|
|
|
14.
郑炳旭. 炸药单耗对赤铁矿爆破块度的影响规律数值模拟研究.
爆破,2015,32(3):62-69
|
被引
8
次
|
|
|
|
15.
Li S H. Analysis of critical excavation depth for a jointed rock slope using a face-toface discrete element method.
Rock Mechanics and Rock Engineering,2007,40(4):331-348
|
被引
19
次
|
|
|
|
16.
Feng C. A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide.
Journal of Rock Mechanics and Geotechnical Engineering,2014,6(1):26-35
|
被引
29
次
|
|
|
|
17.
Li S H. A new numerical method for DEM-block and particle model.
International Journal of Rock Mechanics and Mining Sciences,2004,41(3):436-440
|
被引
25
次
|
|
|
|
18.
叶图强. 露天矿复杂多层采空区爆破处理的研究.
煤炭技术,2014,33(7):281-284
|
被引
1
次
|
|
|
|
|