无底柱分段崩落法采矿进路受力过程分析

在使用无底柱分段崩落法的矿山,大都存在着地压现象。其主要表现是采矿进路和联络道的变形破坏。对采矿进路在开挖和回采过程中各阶段受力情况的分析表明,进路的变形、破坏主要是受到岩体初始静应力、爆破动应力和矿柱支撑应力的综合作用的结果。     

Caving performance through the integration of microseismic activity and numerical modeling at DOZ-PT Freeport, Indonesia

This article describes an undergoing research at PT Freeport,Indonesia,in which the main goal is to use the microseismic information recorded as a result of mining to analyze cave propagation and stress performance on the actual production and fixed in-frastructure.At the moment,several numerical experiments have been conducted to correlate the mining activity with the microseis-mic events using the data collected during year 2005 and 2006.As a result of the preliminary analysis a micro-and a macrocracking envelop were proposed on the basis of computation of stress behavior at the location of the events.Stresses have been computed us-ing standard elastic continuous boundary element models.The correlation between the average source radius and the stress perform-ance has provided a method to propose a macrocracking criterion.Several techniques have been tested to nucleate the microseismic activity around different geological features.This last attempt was aimed to look at potential overstresses induced over the undercut and extraction level drifts.A method was devised to integrate the microseismicity into a 3-dimensional ride distribution model.This model has shown to be very effective to quantify the overstress induced as a result of computing volumetric microseismieity density.The volumetric microseismic model showed to induce overstress up to 10 MPa over a period of two months.The future work will concentrate on the calibration of the integrated model with actual damage observations made at the current mining infrastructure.     

Comprehensive assessment on dynamic roof instability under fractured rock mass conditions in the excavation disturbed zone

The damage process of fractured rock mass showed that the fracture in rocks induced roof collapse in Yangchangwan Coal Mine,China.The rock mass was particularly weak and fractured.There occurred 6 large-scale dynamical roof falls in the excavation disturbed zone (EDZ) with the collapsing volume of 216 m3.First,the field detailed geological environment,regional seismic dy-namics,and dynamic instability of roadways were generally investigated.Second,the field multiple-index monitoring measurements for detecting the deep delamination of the roof,convergence deformation,bolt-cable load,acoustic emission (AE) characteristic pa-rameters,total AE events,AE energy-releasing rate,rock mass fracture,and damage were arranged.Finally,according to the time-space-strength relations,a quantitative assessment of the influence of rock-mass damage on the dynamic roof instability was accomplished.     

毫秒延期雷管分次爆破在井巷施工中的作用

根据毫秒延期电雷管在我矿的推广运用以来,所带来的一些爆破技术问题,文宾山煤矿结合这些技术问题开展对毫秒延期电雷管分次爆破的推广运用.集中我矿技术力量组织采掘班队长、放炮员进行毫秒延期雷管分次爆破技术培训、对掘进工作面每班井下跟班,现场指导毫秒延期雷管爆破技术,收集炮眼布置、装药连线、炮泥封眼及爆破效果等技术参数,从而加以分析改进、总结经验.经过现场施工实践,目前毫秒延期雷管爆破技术在我矿施工队使用中取得一定的成效.     

第七届国际矿业科学与技术大会征稿启事

正1.论文征集由中国矿业大学主办的"第七届国际矿业科学与技术大会"将于2015年4月26~29日在江苏省徐州市中国矿业大学召开,现已开始征集论文。欢迎国内外采矿科学与技术领域的专家、学者踊跃投稿。本次大会以"现代矿山的生态、安全与可持续发展"为主题,探讨、交流矿业科学与技术领域的最新研究进展、面临的机遇和挑战以及该领域的发展前景。2.大会主要议题(1)绿色开采与生态矿山(含能源战略)(2)矿山安全与职业健康     

论煤矿井巷工程中工程变更投资的控制

工程变更是一项贯穿煤矿井巷工程建设全过程的经常性工作.文章首先从两个方面对井巷工程的工程变更进行了分类,然后对常见的影响工程变更情况进行了分析,最后从明确井巷工程变更的目的、严格控制井巷工程设计变更、严格计量管理把好签证关、严格计价管理做好决算管理等五个方面提出了控制井巷工程工程变更投资的方法.     

一种新型的缓倾斜多层矿体采矿技术

针对传统缓倾斜多层矿体的采矿方法 ,如全面法、中深孔落矿下盘漏斗法和爆力运搬法等 ,生产能力小、劳动强度大、安全性差、成本高等缺点 ,从云南锡业公司松树脚锡矿“大马芦”矿段的实际开采技术条件出发 ,提出了一种新型颇有特色的缓倾斜多层矿体的采矿方法———深孔合采井下矿废分离连续采矿法。它采用大直径深孔合采矿岩、井下矿岩集中分离、连续采矿等技术 ,变革了传统的分采工艺 ,有效地克服了传统采矿方法的弊端 ,为缓倾斜多层矿体的高效、低耗和安全开采提供了新的技术方案。     

地浸工艺与传统采矿法的联合应用

阐述了地下采矿的溶浸工艺 (简称地浸工艺 )与传统工艺在国外的联合应用状况。指出该联合工艺对降低采矿损失贫化的必要性和改进的具体途径。分析研究了开采复杂矿体的新工艺 ,并取得了在矿井条件下直接获取成品的具体经验。这些均为我国采矿工艺的更新和发展提供了依据。     

自然崩落法放矿排产优化的数学模型

在自然崩落法相关研究的基础上，探讨了自然崩落法放矿控制的排产优化问题；给出了正向优化和逆向优化的数学模型，为实现均匀放矿提供了一种理想的理论方法。对充分发挥自然崩落法的优越性和提高矿产资源的回收率具有重要的理论和现实意义     

冒落带对地表稳定性的影响

“三带”划分是对采空区上覆岩体一般运动的一个比较客观的描述，本文通过对富桂铅锌矿Ⅶ号矿体地质、采矿及地表岩层变形的研究，计算三带中的冒落带高度小于地表至采空区顶板高度，以此评价采空区上部地表的稳定性。