煤巷顶板锚杆支护及机理研究

从巷道顶板锚杆支护在国内外研究、应用现状出发,基于煤矿巷道顶板稳定性和锚杆支护机理分析,结合对不同锚固方式和杆体材质的评价,对锚杆选择进行了优选。运用锚杆支护理论,对煤巷顶板锚杆支护参数进行了设计计算,并最终确定了煤巷顶板的锚杆支护参数,为矿井煤巷支护设计提供参考。     

浅谈锚杆支护理论及设计方法的应用与发展

对传统锚杆支护理论进行了简要评价,阐述了新的锚杆支护理论,结合晋城矿区锚杆支护的应用,论述了锚杆支护设计方法的发展过程。     

新型塑料膨胀金属锚杆在回采巷道支护中的应用

介绍了一种用于煤矿回采巷道支护的新型锚杆。通过分析该锚杆的工作原理、锚杆在回采巷道工业性试验中的力学性能及支护特性,对巷道进行支护设计。对巷道试验段进行的支护监测结果显示了该新型锚杆在支护技术和作用上的优越性;该锚杆的支护效果与其他支护形式的技术经济比较,表明了该锚杆的实用性。     

隧道围岩锚杆支护参数优化分析

隧道围岩锚杆支护参数的选取是支护结构设计的关键因素,是关系到锚杆支护是否安全可靠的重要问题。下文结合工程实际,对隧道IV级围岩段的锚杆支护进行数据模拟,对锚杆长度及锚杆环向间距进行优化分析,得出适合本工程项目的锚杆长度及环向间距值。     

基于事故树分析法的矿山巷道顶板锚杆支护危险性评价

运用事故树分析法,对矿山巷道顶板锚杆支护危险性进行了评价。对引发矿山巷道顶板锚杆支护失效的各种因素进行了定性分析,从而确定了导致锚杆支护失效的关键因素,为矿山企业优化巷道锚杆支护提供了可靠的依据。     

针对特殊地质条件下的煤巷锚杆支护

煤巷锚杆支护是一种不同于岩巷及其它地下工程的特殊支护,研究了煤巷锚杆支护,明确锚杆支护在煤巷支护中的作用,以及特殊的地质条件如何进行有效的巷道支护。根据不同的地质条件进行合理的锚杆支护,打造一个安全的工作环境。     

复杂地质条件下锚杆联系链的围岩锚固机理探讨

介绍一种与锚杆联合使用的锚杆联系链及其组合支护方式,重点研究其围岩锚固机理,采用数值模拟和现场试验的方法对锚杆联系链组合支护效果进行分析。结果表明,锚杆联系链、锚杆和混凝土喷层三者之间的有机结合提高了围岩的自支撑能力;锚杆联系链组合支护具有作业时间短、安装方便、结构简单、成本低等优点;在兼具喷锚网支护优点的同时,锚杆联系链组合支护也弥补了喷锚网支护的不足,是对矿山现行支护方式的补充和改进。     

煤巷锚杆支护安全问题探讨

从煤巷锚杆支护设计方法和锚杆施工质量等方面对影响锚杆支护安全的有关问题进行了分析,并有针对性地提出了提高锚杆支护质量的具体措施。     

锚杆预紧力的影响因素与确定

锚杆支护的主动、及时支护,主要体现在锚杆支护体系对巷道围岩施加较大的、及时的初期支护阻力,此初期支护阻力,提高了围岩的自承能力、有效地控制了巷道围岩变形。锚杆支护体系的初期支护阻力是由锚杆的初锚力产生的,锚杆的初锚力则是由安装锚杆时施加在锚杆上的预紧力产生的。锚杆预紧力是体现锚杆支护的主动性、及时性的主要指标。合理的预紧力可提高岩层的自支撑能力,保证整个锚杆支护体系充分发挥支护效能。     

岩质边坡锚杆支护的三维稳定分析及工程应用

结合实际工程提出了一种岩质边坡锚杆支护的三维极限平衡分析方法,分析了锚杆的倾向对边坡稳定性的影响.采用所提方法对一个45 m高边坡的实际工程进行了稳定分析,并使用锚杆支护方法进行施工.锚杆上的测力计监测数据表明支护措施是安全可靠的,从而验证了所提方法的正确性.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.