爆破直采技术在面板堆石坝工程中的应用          下载免费PDF全文

周远飞  兰琴  黎声铭 《探矿工程》2009,36(9):77-79

面板堆石坝的坝料开挖直接制约工程进度,按传统工艺开挖费时费工,严重影响施工进度,本工程在利用坝体级配料开挖中采用爆破直采技术,加快了坝料开采速度,效果显著。经过爆破试验,优选爆破参数,为获取粒径与级配符合设计要求及成本低廉的坝料创造了有利条件。详细介绍了试验过程,并对试验结果进行了分析。  相似文献   

定向控制爆破技术在斜井掘进中的应用     

黄寅  潘贵红  杨毅 《南方国土资源》2001,14(4):64-65

文章论述在斜井掘进中采用定向控制爆破技术 ,利用最小抵抗线原理 ,即最小抵抗线方向是爆破作用和岩石移动的主导方向 ,使石渣向后抛掷 ,以充分利用耙斗装岩机工作 ,从而大大提高工作效率 ,降低工人的劳动强度。  相似文献   

冻土位移的散斑照相测量   总被引：1，自引：0，他引：1  

武建军  俞祁浩 《冰川冻土》1997,19(3):258-262

针对冻土受力变形的特性，给出了白光散斑照相，激光散射照相和激光显微散照相技术相结合测量冻土位移的方法，分析讨论了各种散斑照相的测量范围，对冻土弹性变形范围内的位移测量实验表明，这是一种有效的测量手段。  相似文献   

Mechanism of tracer blasting     

S. P. Singh 《Geotechnical and Geological Engineering》1996,14(1):41-50

Summary A variety of overbreak control techniques are used during excavation with the drill and blast system. Tracer blasting is used in Canadian underground mines to minimize blast damage and involves placing a low-strength detonating cord along the length of a blast hole prior to charging with ammonium nitrate-fuel oil (ANFO). The results of tracer blasting are not always consistent and its mechanism is only hazily comprehended. In the absence of a clearly defined mechanism, it is difficult to analyse the results of tracer blasting and to identify the factors responsible for the inconsistency of results.A series of bench blasts and pipe tests were carried out to investigate the mechanism of tracer blasting. The evidence indicated partial deflagration and desensitization of ANFO, thus reducing the total available explosive energy. The rock mass surrounding the traced blasthole experienced a low level of ground vibrations. As a result of the continuous side initiation of ANFO, energy partitioning was more in favour of gas energy. A mechanism of tracer blasting has been proposed and the factors responsible for the inconsistency of the results have been identified in this paper.  相似文献   

基床的水下爆夯试验研究     

吴绵拔  高建光 《岩土力学》1996,17(4):8-14

分析了水下爆炸夯实基床的基本原理及作用机理，并应用于海南和帮码头基床的爆夯，取得预期的效果，表明基床的水下爆夯法有效，可行，具有广阔的应用前景。  相似文献   

中华路立交桥的爆破拆除          下载免费PDF全文

方德平  李军  梁杰 《探矿工程》1997,(1):53-54

详细论述了齐齐哈尔市中华路立交桥爆破拆除施工中所遇到的各种技术问题及解决办法。  相似文献   

黑火药控制爆破在花岗岩石材开采中的应用          下载免费PDF全文

蒋德全  陈庆寿 《探矿工程》1997,(4):57-58

介绍了黑火药控制爆破法在河南省商城县花岗岩开采中的试验与应用，给出了工作面开采要素和合理的爆破参数。  相似文献   

核电秦山二期坝址开山工程爆破技术综述          下载免费PDF全文

胥传辉 《探矿工程》1997,(6):47-49

结合大型开山工程的实际，总结了设备选型和施工，管理技术，从合理布设穿孔间距，防滚石下海，地平面保护等方面控制台阶爆破质量，并介绍了台阶爆破的安全控制措施。  相似文献   

混凝土结构的切割爆破技术          下载免费PDF全文

龚汉松 《探矿工程》2007,34(11):54-56

通过大量的素混凝土及钢筋混凝土结构切割爆破实践,分析归纳出其主要爆破参数计算方法和工程施工技术特点。将这些计算方法和技术要点应用于工程实践,取得了较好的切割爆破效果,达到了相应的工程目的。  相似文献   

A Fragmentation Modelling Framework for Underground Ring Blasting Applications     

I. Onederra 《Fragblast: International Journal for Blasting and Fragmentation》2004,8(3):177-200

Empirical approaches for predicting fragmentation from blasting continue to play a significant role in the mining industry in spite of a number of inherent limitations associated with such methods. These methods can be successfully applied provided the users understand or recognize their limitations. Arguably, the most successful empirical based fragmentation models have been those applicable to surface blasting (e.g., Kuz-Ram/Kuznetsov based models). With widespread adoption of fragmentation assessment technologies in underground operations, an opportunity has arisen to extend and further develop these type approaches to underground production blasting.

This paper discusses the development of a new fragmentation modelling framework for underground ring blasting applications. The approach is based on the back-analysis of geotechnical, blasting and fragmentation data gathered at the Ridgeway sub level caving (SLC) operation in conjunction with experiences from a number of surface blasting operations.

The basis of the model are, relating a peak particle velocity (PPV) breakage threshold to a breakage uniformity index; modelling of the coarse end of the size distribution with the Rosin-Rammler distribution; and modelling the generation of fines with a newly developed approach that allows the prediction of the volume of crushing around blastholes.

Preliminary validations of the proposed model have shown encouraging results. Further testing and validation of the proposed model framework continues and the approach is currently being incorporated into an underground blast design and analysis software to facilitate its application.  相似文献