—150运输大巷跨采段优化注浆加固参数技术研究与应用

介绍了云驾岭矿—150运输大巷跨采段优化注浆加固参数技术研究成果,通过优化注浆加固参数,增强了巷道围岩的自身强度,达到了有效治理巷道变形的目的,满足了该段巷道在12200工作面跨采时的巷道支护强度要求,解放了12200跨采工作面的煤炭资源。     

特厚煤层综放采动下软岩巷道支护技术

采动巷道围岩控制是当今世界地下工程中一项重要而复杂的技术问题,是高应力巷道支护的一个重要分支,而目前对淮北矿业集团芦岭煤矿采动巷道的专门性研究相对较少,造成一些工程失败。-590大巷服务年限比较长,这些地段一旦跨采后破坏严重,修复工作将给矿井生产造成巨大损失,并且对生产安全存在巨大威胁。因此必须提出切实合理的支护方案,并实施跨采前预加固措施,这对于维护巷道的稳定,保证矿井安全生产,具有重要的现实意义。     

下覆煤层组开采大巷围岩稳定性控制技术

巷道受重复采动影响,围岩状况发生恶化,巷道围岩变形是一个动态的拉压交替的过程。为解决下覆煤层组开采过程中巷道围岩稳定性问题,分析了下覆岩活动规律和大巷围岩稳定性特征。基于动态控制过程原则,确定合理的加固技术与加固原则,并对加固后的大巷围岩的稳定性进行合理预测。泉沟煤矿-115大巷的相似材料模拟实验和现场工程实践表明,该技术可行,可以在类似条件的巷道中推广应用。     

跨采巷道的变形破坏与控制关键

本文介绍了动压影响下底板破坏机理，以及不同位置的跨采巷道受工作面回采的应力分布特点，并简单概括了跨采巷道围岩稳定控制的关键。     

受采动影响的底板岩巷围岩治理方法探讨

-700m西大巷担负着矿井二水平西翼的运输任务，其上方为II 1023工作面，由于巷道顶板距工作面煤层法距仅11-23m，II 1023工作面回采后，其采动的超前压力和顶板的周期来压对大巷产生很大的破坏，造成大巷部分地段出现片帮漏顶、底鼓等现象，为后期的修护、通风、行人及运输安全带来很大的难题．因此必须提前对该段巷道进行加固。     

关于采场巷道矿压控制设计问题

本文根据三维相似材料模拟实验、有限元电算模拟和现场实测研究结果,阐述了采场周围煤体上和矸石上压力分布随上复岩层运动发展而变化的规律,特别是低应力区形成的时间和稳定的条件,在此基础上分析了不同开掘位置和时间下顺槽的维护状况,提出了预计其围岩变形量的方法.文章认为,没有巷旁充填维护的留巷及在内应力场中开掘的巷道,其支护阻力都应按对老顶采取"给定变形"工作方案设计,文章着重指出,不同条件下采场的支承压力分布(包括压力高峰位置和内应力场范围大小等)及其显现是不同的,利用井下动态观测研究方法,实测确定老顶岩梁的裂断线位置和显著运动完成的时间,从而确定低应力区的范围和稳定的时间,是决定顺槽开掘的合理位置和时间的关键、文章最后分析了跨大巷回采和跨上山回采时工作面的合理布置方案.文章以现场巷道矿压控制实例或实测巷道矿压显现证实了上述巷道矿压控制设计的原理和方法.     

大埋深跨采巷道变形机理分析

巷道受采动影响时,应力重新分布,围岩处于卸压状态,导致巷道变形严重。针对这一现象,在华恒煤矿-1000m水平副暗斜井,利用现场实时在线监测数据和数值模拟计算,分析了跨采巷道随采煤工作面推进的变形破坏规律。监测数据表明,巷道变形包括顶板下沉、两帮移近和底鼓,其中底板变形破坏最严重。数值模拟分析得出,跨采后的巷道底板和右帮塑性区范围比跨采前有较大增长;在巷道顶底板处,围岩垂直应力处于卸压状态,水平应力出现应力集中现象。垂直应力的卸压和水平应力的横向作用是造成巷道底鼓的力学原因,底板没有采取支护措施是造成底鼓的直接原因。     

大同煤业股份有限公司燕子山矿8#层围岩及支护参数优化

大同煤业股份有限公司燕子山矿巷道顶板稳定性较好,北翼回风大巷、轨道大巷以及运输大巷顶板是石灰岩,底板是细砂岩,两帮全部为煤层。为了合理评价燕子山矿巷道顶板的稳定性,本项目计划采用现场调研、围岩物理力学性质试验分析、理论分析和数值模拟计算等综合研究方法,来进行燕子山矿巷道顶板稳定性分级,据此来优化燕子山矿巷道支护参数。巷道围岩分类及巷道支护参数优化项目研究工作,是通过北翼回风大巷8#煤围岩微观分析、力学性能试验、北翼回风大巷巷道支护参数的优化设计研究等工作。项目主要研究内容包括:巷道围岩物理力学参数测试与分析、巷道围岩顶板稳定性分级、巷道支护设计理论研究、巷道支护参数的优化设计。总之,本项目以矿山岩石力学、弹性力学等理论为指导,结合理论分析、现场调研、常规力学试验和数值模拟等方法,进行燕子山矿8#煤层巷道围岩稳定性分级及巷道支护参数优化设计。     

老鹰山软弱岩层井巷形变观测及矿压显现规律的研究

采用老鹰山煤矿的实测资料，在对老鹰山煤矿受采动影响的1550东大巷矿压观测数据进行统计分析、基本掌握巷道变形和破坏规律的基础上，对引起巷道破坏的主要原因进行探讨，并提出了改善井巷维护条件的相应措施。     

综放面近距离跨采下山分区加固技术

底板巷道围岩加固是近距离跨采应研究的一个关键技术。文中针对龙固煤矿7201工作面赋存特点,根据跨采采动应力对下山影响范围,提出了对跨采下山以小孔径锚索进行"分区加固"的方案。采用非线性数值分析软件UDEC,系统地分析了跨采下山围岩变形机理及支护物应力、应变变化特征。对加固区域巷道围岩收敛进行的观测表明,当工作面与下山垂距为10 m时是巷道水平应力变化的敏感区,以此作为"分区加固"的指标是合理的,加固效果明显,可为类似条件提供参考。     

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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