基于FLAC^3D的下向进路胶结充填采场参数研究

采用下向进路胶结充填法的矿山,回采断面尺寸是关系矿山安全生产的重要参数．结合工程实际,采用FLAC^3D数值计算软件研究了矩形断面尺寸与采场稳定性的关系,对进路开挖后充填采场应力、位移、塑性区进行了分析．结果表明：进路高度对采场稳定性影响不大,跨度为6m时采场处于失稳临界状态．     

下向进路胶结充填顶板稳定性数值模拟

针对大断面胶结充填体稳定性问题.应用数值模拟方法,对分级尾砂充填体变形规律进行了研究,得到了如下结论:充填体内布筋后可有效减小顶板拉应力区域,提高顶板的稳定性;灰砂比为1:4的充填体可以作为承载层,其变形、应力分布规律与承载梁基本吻合,可替代钢筋混凝土人工假项.     

某矿上向胶结进路充填采矿法采场结构参数优化研究

本文采用MIGAS-GTS有限元软件,以某矿山为背景,建立三维数值模型,对不同采场结构参数进行了模拟,并对模拟结果进行详细地分析,最终确定上向水平分层进路充填法采用进路规格3m、长度为22m的矿体结构,其为最优结构参数。     

胶结充填法采场围岩与充填体相互作用研究

本文从胶结充填材料及碎裂岩体的力学特性出发,分析、研究了胶结充填法采场围岩与充填体相互间的力学作用,建立了其力学模型,并求得了解析解答。这些解析结果可应用于采矿设计及指导生产实践。     

下向分层进路充填采矿法中采用尾砂胶结充填的研究

针对金城金矿东季矿区应用下向分层进路充填采矿法时,因海砂胶结充填料输送难、矿区需建多个充填站,而高水速凝胶结充填体后期强度低,不适用于下向充填采矿法等问题,开展了尾砂胶结充填新工艺的研究。     

两步骤分段空场胶结充填采场结构参数优化

合理的采场结构参数对矿山的安全经济回采具有重要意义。某岩金矿山矿体为倾斜中厚矿体,为保证矿山的安全、高效生产,采用两步骤分段空场胶结充填采矿法开采,并对采场结构参数进行优化。采用有限差分软件Flac~(3D)对两步骤回采采场进行数值模拟分析,确定其最优采场结构参数。根据Flac~(3D)数值模拟分析结果确定采场分段高度为15 m,这不仅保证了回采的安全性,并且可以保证回采效率,以低成本、高产出的方式完成矿房回采工作。模拟分析优化结果可用于指导矿山安全经济回采。     

上向进路充填采矿法采场结构参数优化研究

采用MIDAS-GTS有限元软件,以某矿山为背景,建立三维数值模型,对不同采场结构参数进行了模拟,并对模拟结果进行详细分析,最终确定上向水平分层进路充填法采用进路规格3 m、长度为22 m的矿体结构,其为最优结构参数。     

基于FLAC~(3D)下向进路采场参数优化

为获得最优采场参数,应用数值模拟软件FLAC~(3D)对不同进路采场结构参数进行计算,分析不同参数的进路在开挖过程中位移和应力变化特征,获得不同方案进路开采位移和应力随进路宽度和高度的变化曲线,选出最优的进路参数。结果表明:进路宽度的变化对采场顶板的稳定性较进路高度明显,进路宽度达到4.0 m时采场顶板的最大拉应力超出了其自身极限抗拉强度,最大位移量达43 mm,顶板在开挖后自身稳定性较差。综合考虑三山岛金矿新立矿区生产能力和安全性,建议矿山选择进路宽度为3.5 m,高度为3.0 m。     

机械化下向胶结充填采矿法

本文介绍金川镍矿受用机械化下向胶结充填采矿法经过１０年的试验、推广、改革取得的许多经验。由于在受矿工艺、充填工艺、设备维修、劳动工资方法的重大改革，使机械化开采比普通（电耙）法开采劳动生产率提高４倍，开采成本降低２１．９１元／ｔ。     

诸暨金矿下向分层进路胶结充填法的应用

该采矿法的适用条件，脉内外天井采准方案的布置，采矿充填工艺；充填系统，充填体稳定性及其出现的问题；技术经济指标和经济效益。     

FLAC3D在圈定地表移动带中的应用

论述了传统的地表移动带的圈定方法存在的弊端.并以某铁矿为例,先用传统的方法对其地表移动带的范围进行初步圈定,然后用FLAC3D软件对地表移动带的范围进行模拟.通过对比分析,并结合实际的工程条件,以数值模拟的结果作为定量参照,对初步圈定的地表移动带进行修正.最终较为科学地圈定了地表移动带的范围.     

基于块体理论的三山岛金矿采场顶板稳定性分析

通过对三山岛金矿新立矿区的典型采场进行现场调查及部分冒顶位置现场勘察,发现采场顶板冒顶破坏的形式主要表现为一种“倒三角形式”的破坏,即顶板受节理构造影响存在危岩体.为了解决这一顶板冒顶问题,对采场岩体结构和力学性质进行研究就显得尤为重要.在现场调查研究的基础上,通过应用块体滑动理论,分析危岩体所处开挖面及不连续面构成一...     

基于PMV的矿井独头巷道通风效果分析

矿井独头巷道内高温环境日益严重,根据传热学和流体力学理论,应用F luent软件对某深井独头巷道内的通风风流速度场、温度场进行模拟,并利用预测平均热感觉指标PMV对通风效果进行评价.结果表明:独头巷道通风风流结构分为射流区、回流区及涡流区,其中涡流区流速最小,换气效率最差;利用M atlab进行计算,得出PMV值范围为0.7~1.7,热感觉评价等级为稍暖,该结果与实际情况吻合.PMV值受巷道内空气温度、速度影响较大,在巷道中间高度位置(y=1.5 m)处,由于涡流的存在,风速较小,换气效率差,空气温度高,导致PMV偏大,因此,提高矿工热舒适性首先要考虑控制好巷道内空气温度及流速.     

基于Flac3 D数值模拟的深部采场结构参数优化及应用

针对阿尔哈达铅锌矿上向水平分层充填采矿法采场结构参数的确定开展相关研究,采用Flac^3D数值模拟软件建立了留顶柱不留底柱、留底柱不留顶柱共2种数值模型,分步模拟计算各方案在回采过程中的应力和位移分布规律,分别从拉应力和底板上鼓量、顶板下沉量分析比较方案的优缺点。研究结果表明：首采分层开挖后,2种方案采空区的顶底板均出现了拉应力集中,采空区两侧围岩出现压应力集中区域;留底柱不留顶柱的方案拉应力出现明显下降,仅为2.30 MPa左右,因此选择留底柱不留顶柱的方案作为阿尔哈达铅锌矿上向水平分层充填采矿法的采场结构布置形式。     

Color-tunable hypersensitive temperature sensor based on metal organic framework doped with Eu3+ and Dy3+ via phonon-assisted energy transfer

In this work,catena-[(μ-benzene-1,3,5-tricarboxylato)-(1,10-phenanthroline)-(N,N-dimethylfo rmamide)-gadolinium(ⅲ)-N,N-dimethylformamide solvate](denoted as Gd-MOF) co-doped with Eu³⁺ and Dy³⁺was successfully synthesized.The entire X-ray diffraction peaks of the sample match well with the GdMOF phase.A detailed characterization by inductively coupled plasma mass spectrometry(ICP-MS)shows that the actual concentration is basically consistent with the design concentration.The...     

武山铜矿下向进路充填采矿法采场顶板爆破震动效应研究

为了扩大矿山生产能力,武山铜矿正进行大断面下向进路回采充填工艺和采场结构参数优化的试验研究。使用Blastmate Ⅲ测振仪对试验采场的充填体顶板进行了4次爆破震动实测,运用线形回归推导出了项板的最大爆破振速公式,其测试数据和结论对类似矿山有一定的借鉴意义。     

Effect of Yb3+ concentration on upconversion luminescence of AlON:Er3+ phosphors

AlON:1.6 mol.%Er3+, x mol.%Yb3+(x=0, 2.6, 3.1, 3.6, 4.1, 4.6) phosphors were synthesized successfully by aluminothermic reduction and nitridation(ATRN) method and characterized by X-ray diffraction(XRD), scanning electron microscopy(FESEM) and upconversion photoluminescence(UCPL) emission spectra. Under the excitation of diode laser 980 nm, the green(556 nm) and red(655 nm) upconverted emissions were observed, attributed to the 4S3/2→4I15/2 and 4F9/2→4I15/2 transition of Er3+respectively. The emission intensity increased with increasing Yb3+ concentration due to the energy transfer(ET) between Yb3+ and Er3+. The upconverted emission reached the highest as x=3.6, and was pump-power dependent involving a two-photon process.     

Influence of Nd3+ concentration on mid-infrared emission in PbF2 crystal co-doped with Ho3+ and Nd3+ ions

A promising series of Ho_yNd_xPb₍(1—x—y))F₂(x = 0, 0.01, 0.02, 0.03, 0.04; y = 0.02) crystals was grown by the Bridgman method. The influence of the Nd³⁺ions concentration on mid-infrared(～2.0, ～2.9 and ～3.9 μm)fluorescence emissions of Ho³⁺ions in the PbF₂ crystal excited by 808 nm laser diode was investigated in this work. The energy transfer mechanism between Nd³⁺ions and Ho³⁺ions under different ...     

Effect of Al3+ on Tobermorite Crystallinity

The difference betWeen the systems of CaO-SiO₂-H₂O and CaO-SiO₂-Al(OH)₃-H₂O, was studied,especially the effect of Al³⁺ on the crystallinity of tobermorite was focussed. As a result, in the system of CaO-SiO₂-H₂O, tobermorite formed early, howevey, with reaction time forward, tobermorite was replaced by xonotlite. So far as CaO-SiO₂-Al(OH)₃-H₂O was concemed, hydrothermal reaction was carried out under the same condition as CaO-SiO₂-H₂O to study the morphological changes of tobermorite crystals. It was found that Al³⁺ accelerated the crystal growth of tobermorite to some extent and was in favor of platy crystals. Moreover, with the Al³⁺ content increasing in the starting material, the morphology of tobermorite did not change magnificently, but platy crystals became more and more eminent. As soon as the Al₂O₃ content was over 15.6%, synthetic mineral greatly changed in structure and turned into hibschite different from 1.1 nm tobermorite. Obviously, xonotlite was not apt to form in the presence of Al³⁺.