浅析工作面内部留巷

1.工作面概况及遇断层时留巷的方法我矿741工作面倾斜165m,煤层倾角平均13o。煤层厚度平均2.5m,顶板为泥岩,工作面采用“三四”排走向棚齐梁式管理顶板。当工作面收作面距收作线还有50m时,在风巷向下20m处收作面遇到落差为4m的走向断层山子断层落差太大,顶板又易漏顶,管理相当困难,如果工作面继续向前回采,不但影响进度和产量,也无法保证在过断处不出安全事故,如果提前把工作面收了,会造成煤炭资源的浪费,最后采用在工作面内部留巷的办法解决了此问题,我们首先把工作面上段25m清理回固好,回收成三梁三柱,并使其“三封闭”,再把工作面链板机…     

大采高综采工作面过破碎带顶帮注浆加固技术

大采高综采为国内新兴的一项厚煤层综合机械化开采工艺,其主要优点是产能高、用人少。用大采高综采的矿井,极易实现高产高效的矿井建设目的。该工艺的局限性在于应对破碎顶板条件的能力差。8102工作面是在2类-Ⅱ型顶板下首次采用4.5米大采高综采工艺,在回采过程中遇到一宽约50米的破碎带,工作面频繁发生片帮,顶板维护非常困难。为保证首采工作面顺利推进,对工作面破碎带的顶帮进行了注浆加固技术并取得了良好的效果。利用化学浆对大采高工作面顶帮进行注浆加固,改善了煤壁与顶板的力学性质,为大采高工作面安全顺利回采提供了有利的条件,为矿井高产高效提供了一项实用技术。     

掘进工作面帮顶控制

随着国家对安全工作的重视程度不断增加,维护掘进工作的安全,减少和有效避免施工事故的发生成为人们关注的重点。有效的掘进工作面帮顶控制,可以切实提升采、掘、修工作面的帮顶管理效率,尤其在特殊地质条件下,掘进工作面帮顶更加难以控制,断层区域、高瓦斯区等都是造成掘进工作面帮顶事故发生的主要原因,该文通过分析煤(岩)层赋存特征,对巷道支护参数进行设计,并实时监控帮顶变化情况,并对监控数据进行分析,最终实现矿井的安全掘进。     

大倾角仰斜开采工作面支护参数的研究

1、引言 在工作面倾角大、仰采角度大等条件下，仰斜开采工作面的顶板控制显得非常重要。当仰斜角大于12°时，工作面顶板的拉破坏及向采空区方向的下滑分力将给工作面的安全生产造成很大影响．合理确定仰采条件下的支护参数，有效控制工作面顶板是安全顺利开采的重要保证。[第一段]     

浅谈断层区域开采技术

本文主要从技术角度论述了大断层附近开采防治方法，在遇到顶板破碎、地包夹石时，采取加强支护、预爆实施顺利开采；在断层区顶板压力较大时，采取爆破卸压、单位支护保证安全开采，并对爆破方法及应对工作面漏顶做了介绍，通过两个工作面的运行实施，摸索出了更加具体、更具操作性的开采经验，非常值得学习和推广。     

大倾角条件下综采工作面过断层回采实践

综采工作面遇断层时,极容易出现片帮、冒顶等顶板事故,尤其是在落差大于采高、大倾角工作面等困难条件下,给安全生产带来巨大的压力和困难,葛泉矿通过长短距离注浆加固、严格的回采工艺措施,实现了大倾角条件下综采工作面顺利通过大落差断层,避免了工作面搬家,杜绝了顶板事故,取得了宝贵的现场经验。     

深井孤岛工作面过探巷技术研究

邢东矿2225工作面为孤岛工作面,承受地压大,回采过程中经过2225探巷,巷道围岩破坏剧烈,尤其是底鼓变形严重,初期采取排木垛、打单体等措施在一定程度上控制了探巷顶板下沉,而工作面临近时在煤帮注化学浆形成锚注加固结构使煤体自身强度及承载能力显著增强,锚注加固结构具有较好的整体性和稳定性,从而实现工作面顺利回采。     

赵庄二号井煤层巷道顶板全锚索支护技术研究

赵庄二号井1305大采高工作面采用一次采全高开采工艺,设备型号尺寸比较大,巷道沿煤层顶底板掘进,要求巷道断面比较大,巷道净宽达5.0m,净高达4.9m,属于超高大断面巷道。加之赵庄二号井巷道直接顶为泥岩,极易风化变形破碎,因此,必须采用强力锚杆支护系统,控制巷道围岩的整体完整性,保持巷道的稳定。对于巷道顶板尽可能采用高预应力强力支护体系,防止顶板的下沉离层,故此采用高预应力全锚索进行支护;对于巷道帮部,采用锚杆锚索联合支护系统控制煤帮的整体完整性。     

凤凰山矿XV4216掘进工作面过断层方案设计

阐述了综掘工作面大坡下山掘进,在遇断层且有淋头水情况下的施工方案设计。经现场实施,顺利通过了此构造断层,为今后掘进工作面通过类似的地质构造提供了设计方案。     

走向长壁高档采煤工作面支护力

1．控顶中距和压力 走向长壁工作面顶板的控制，因老顶强大的压力，直接顶悬臂的距离越大，直接顶弹性下垂量由煤壁至老塘逐渐增大，作用在控顶区单体上，从煤壁到老塘压力巨增，就尽量减少控制顶板的距离，让顶及时冒落。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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