解析红柳林煤矿中巷道超前支护液压支架的应用

巷道超前支护液压支架主要由金属结构件、液压系统组成，它具有支护强度高、安全性高、支护速度快的优点，能有效的满足高效综才工作面生产的要求，还可以保证煤矿开采安全、高效的进行，因此被应用到包括红柳林煤矿在内的很多的大型现代化煤矿中。本文主要分析了巷道超前支护液压支架的结构，探讨了红柳林煤矿中巷道超前支护液压支架的应用。     

煤矿软岩巷道掘进支护技术探讨

在煤矿软岩巷道的施工建设中,其掘进支护技术的应用关系到整个巷道的稳固性,对于保证煤矿开采人员的人身安全具有重要意义。在煤矿软岩巷道掘进支护施工过程中,由于软岩强度低,围岩应力水平较高,岩层中的粘土矿物质会吸水膨胀,影响到支护结构的稳定性,需要通过提高围岩强度、围岩支护表力等方式来降低岩层变形对掘进支护施工的影响,目前普遍采用的软岩巷道支护技术锚杆联合支护技术与锚网喷支护技术,需要根据煤矿开采区域的地质特点来选择合适的掘进支护方式。     

煤矿深井支护对策研究

随着煤矿开采深度的不断增加,深井巷道受到的地下水水头也会增大,同时巷道近场围岩有效应力也会随之增大,致使围岩应力超过其强度发生破坏失稳。本文就煤矿深井支护的一般对策进行了一定的分析,首先分析了当前煤矿掘进支护的发展现状与问题,在此基础上,从两个不同的角度分析了煤矿深井支护的对策,包括深井高应力软岩回采巷道支护对策,以及如何利用混凝土进行永久性支护,具有一定的实用性。     

井筒围岩应力分布及支护强度相似模拟

为了对井筒围岩应力分布及支护强度进行分析,采用相似材料模拟实验对龙家堡煤矿立井井筒围岩应力分布状态进行了模拟,并结合理论计算结果及数值模拟结果对支护强度进行了分析.实验结果表明,井筒围岩应力分布呈南北向居大,支护强度与实测强度吻合,能够满足井筒支护要求.同时也为矿井投产后巷道支护提供了有利依据.     

大采高综采工作面回采巷道围岩控制的探讨

探讨了煤矿大采高综采工作面回采巷道围岩稳定性控制方案,分析了支护方案选择,详细阐述了锚固形式、锚杆长度、锚杆直径、锚杆强度等支护参数设计,不仅丰富了大采高工作面巷道围岩稳定性控制的理论和实践,而且将促进煤矿尽快实现高产高效。     

不连沟煤矿工作面辅助运输巷道围岩控制技术

巷道支护选择设计直接影响到巷道围岩的控制效果。针对不连沟煤矿工作面辅助运输巷道煤体竖向裂隙发育、侧帮围岩破碎严重等问题,通过分析不连沟煤矿F6103工作面巷道维护的现状和原支护设计,提出以增强支护强度和加固破碎岩体为目标的控制优化方案。工程实践显示了采用支护优化方案,提高了围岩的稳定性,解决了巷道变形和失稳难题。     

复杂地质条件下的煤矿掘进支护技术应用解析

社会经济发展,对煤炭资源的需求量不断攀升,然而随着煤矿开采强度与开采深度的增加,煤矿开采所面临的地质问题日趋复杂,在复杂地质条件下进行煤矿开采活动,影响煤矿掘进速度及安全的因素较多,如地质断层、地质褶曲等问题。为保障复杂地质下煤矿开采活动的安全性,结合工程案例,对复杂地质条件下影响煤矿安全生产的因素进行探索,提出复杂地质条件下煤矿掘进支护关键技术,探索综掘锚网支护过断层技术,通过安全支护,保障巷道掘进支护的安全性与可靠性。     

某煤矿顺槽巷道锚网支护系统研究方案

本文介绍了某煤矿17煤顺槽巷道锚网支护系统,通过分析可以看出,该支护系统具有良好的经济效益与社会效益,在煤矿巷道的支护中有一定的推广价值。     

复合顶板条件下的大跨径大间排距预拉力锚网索支护实践

以新庄孜煤矿56204顺槽为例，系统地介绍了复合顶板条件下的大跨径、大间排距预拉力锚网索支护方案、煤层巷道围岩稳定性特征分析、支护思想，提出根据地质备件强化顶板，减缓两帮压力，加强高帮侧支护强度，加大初期支护投入是支护成功的有力保证。     

岩体参数确定与顶板锚固技术应用

针对波兰煤矿地下开采中的锚杆支护应用实践 ,提出了统一的采矿地质和技术条件的评价方法。用修定的RMR岩体量化指数从给定公式中确定岩体强度和应变参数。基于虎克 -布朗强度准则给出了岩体及顶板锚固的数值模型。在不同的采矿地质条件下 ,进行了多种顶板锚固应用研究。这些支护实验表明 :这种方法应用于巷道的初次支护和顶板加强支护是安全可靠的     

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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