高应力破碎带松软岩层大断面巷道支护技术研究

介绍了平煤集团六矿二水平戊二技改皮带暗斜井穿过高应力破碎带松软岩层时的支护技术。运用锚网支护基本理论，通过计算并借鉴有关工程经验确定锚网支护参数；采用大型岩土工程分析软件FINAL，对预应力群锚加固机理与加固效果进行了多方案、多参数的数值模拟研究，根据研究结果确定锚索支护参数。实践证明，采用“锚网 注浆 锚索”的联合支护技术，可有效控制高应力破碎带大断面软岩巷道变形，并可取得较好的经济效益。     

高应力破碎带大断面巷道支护技术

运用锚网支护基本理论,计算选择锚网支护参数,采用大型岩土工程分析软件FINAL对预应力群锚加固机理与加固效果进行了多方案、多参数的数值仿真研究,确定锚索参数。试验表明,采用“锚网 锚索 注浆”的联合支护技术,安全地支护了高应力破碎带软岩巷道,取得了良好的支护效果和经济效益。     

复杂地质条件下预应力锚索和注浆联合支护技术

阐述了对高应力区破碎松软岩层大断面巷道进行锚网支护的同时,采用预应力锚索和注浆联合支护进行加固的理论研究、施工工艺、技术要求和支护效果。     

不同条件下锚杆支护技术

结合实际对锚杆支护技术问题进行了分析，重点探讨了松软围岩巷道锚注加固、复合顶煤巷锚带网(锚杆、钢带、金属网)加锚索联合支护、综放顺槽采用锚杆锚索联合支护、综放面末采中应用锚网支护等技术问题。     

极破碎软岩巷道失稳机理与动态迭加耦合支护技术研究

基于赵庄矿极破碎软岩巷道长期矿压监测、围岩力学参数测试与矿物成分分析及松动圈测试等成果,分析了巷道围岩变形破坏的特点,揭示了极破碎软岩巷道变形失稳机理;针对该矿极破碎软岩巷道提出了由预留变形量、锚网索喷耦合支护、二次锚注加固组成的动态迭加耦合支护技术方案,并通过相似模型试验和井下工程实践对该技术方案的支护效果进行了验证。研究表明：通过预留变形量释放围岩中的变形能和高应力,顶板高预应力锚索、帮部高预应力锚杆和低预应力锚索实现“控顶卸压”,低压浅孔充填和高压深孔渗透注浆相结合形成积极有效的锚注支护结构和多层组合拱(梁)结构,底角和底板锚注有效控制巷道底鼓,从而实现对极破碎软岩巷道围岩变形的有效控制。     

深井高应力非常规断面动压巷道支护技术研究

目前,国内关于高应力动压巷道非常规段面掘进技术方面的文献较少.本文分析了巷道所处区域水文地质条件和应力分布情况,并参考了数值模拟结果,对翟镇煤矿11103E高应力动压巷道采用了非常规断面掘进,锚带网初次支护只挂顶网,回采时锚带网加强支护挂帮网,特殊地段锚索注浆加固的方法;最终就巷道围岩表面位移、巷道围岩深部位移和锚杆(索)锚固力等矿压监测结果,进行了支护效果检验,结果表明支护技术安全有效.     

马路坪矿深部白云岩巷道支护方式数值分析

开磷集团马路坪矿自从进入深部开采以来,深部白云岩越来越破碎,岩石整体性越来越差.通过巷道在锚网加锚索联合支护方式、钢筋混凝土支护方式、锚杆加锚索支护条件下的应力分析得出,采用锚网加长锚索联合支护时巷道的顶板、底板及侧帮的应力均较小,同时支护成本较低、施工方便,则锚网加长锚索支护方式为最佳支护方式.     

三锚联合支护技术在深井掘进过断层带施工中的应用

针对深井高地应力巷道过大范围断层破碎带施工与支护难题,滕东生建煤矿合理确定支护参数和施工工艺,关键采用了"三锚"联合支护技术,即巷道开挖后立即进行锚网喷、锚索一次支护,然后进行锚注支护加固破碎围岩,确保安全顺利地通过了断层破碎带,取得了良好的支护效果。     

锚、网、带＋锚索联合支护技术在全煤巷道中的应用

介绍了忻州窑矿锚、网、带＋锚索联合支护技术在全煤巷道的应用情况，分析了锚、网、带＋锚索联合支护技术的原理，探讨了锚、网、带十锚索联合支护的方案设计、参数选择、以及支护效果和经济效益。     

不同地质条件下的锚杆支护技术

影响巷道围岩完整性和稳定性的主要因素有巷道围岩强度、地应力、巷道断面形状和巷道断面尺寸等。不同地质条件下锚杆支护技术主要包括:松软围岩巷道锚注加固;复合顶煤巷锚带网加锚索联合支护;综放顺槽采用锚杆锚索联合支护;综放面末采锚网支护。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium