巷道支护分析

通过运用顶板运动规律和锚杆支护的作用机理,对锚杆参数的确定和支护效果进行了论述,并通过实例对现有巷道顶板维护方式进行分析,提出合理的支护方式,以期达到降低巷道支护费用的目的.     

浮顶罐内原油温降计算方法研究

目前国家石油战略储备库工程已陆续启动和建成。浮顶罐内原油的凝结问题是制约储备库安全经济储油的瓶颈之一。本文在研究国内外各种浮顶罐内原油温度计算方法的基础上建立了一套计算方法体系,为了方便工程应用,还编制了原油温降计算软件,在已知气象数据、原油物性参数和储罐技术参数的前提下,可计算原油的温度变化。实际算例表明,计算结果与实际值较接近,能够反映原油随储存时间等因素变化的趋势。     

浅析油毡卷材屋渗漏原因与防治

油毡卷材渗漏是影响建筑工程质量的重要原因。该文通过对油毡卷材屋渗漏原因的具体分析 ,提出了防止油毡卷材屋渗漏的具体措施     

Influence of the composition of artificial turf on rotational traction and athlete biomechanics

Artificial turf advances have enabled surfaces to behave like natural grass, however, debate remains as to whether artificial turf is as safe as natural grass. To reduce injury risk, sport surfaces should have low rotational traction with artificial surfaces having a potential advantage as components can be manipulated to change surface properties and traction. The purpose of this study was to investigate the influence that different components of artificial turf have on rotational traction and athlete lower extremity joint loading. Twelve surfaces underwent mechanical testing to determine the influence of fibre density, fibre length, infill composition and compaction on rotational traction. Following mechanical testing, Control, Low and High Traction surfaces were selected for biomechanical analysis, where sixteen athletes performed maximum effort v-cuts while kinematic/kinetic data were recorded on each surface. Mechanically, fibre density, type of infill and compaction of the surface each independently influenced traction. The traction differences were substantial enough to alter the athlete kinematics and kinetics. Low traction surfaces reduced ankle and knee loading, while high traction surfaces increased ankle and knee loading . Reducing the rotational traction of sport surfaces is possible through alterations of individual components, which may reduce the joint loading at the knee and ankle joint.     

Skin friction related behaviour of artificial turf systems

The occurrence of skin friction related injuries is an issue for artificial turf sports pitches and remains a barrier to their acceptance. The purpose of this study was to evaluate the current industry standard Securisport® Sports Surface Tester that measures skin surface related frictional behaviour of artificial turf. Little research has been published about the device and its efficacy, despite its widespread use as a standard FIFA test instrument. To achieve a range of frictional behaviours, several “third generation” (3G) carpet and infill combinations were investigated; friction time profiles throughout the Securisport rotations were assessed in combination with independent measurements of skin roughness before and after friction testing via 3D surface scanning. The results indicated that carpets without infill had greatest friction (coefficients of friction 0.97–1.20) while those completely filled with sand or rubber had similar and lower values independent of carpet type (coefficient of friction (COF) ≈0.57). Surface roughness of a silicone skin (s-skin) decreased after friction testing, with the largest change on sand infilled surfaces, indicating an “abrasive” polishing effect. The combined data show that the s-skin is damaged in a surface-specific manner, thus the Securisport COF values appear to be a poor measure of the potential for skin abrasion. It is proposed that the change in s-skin roughness improves assessment of the potential for skin damage when players slide on artificial turf.     

大采高综采工作面顶板控制技术

为了保证两硬大采高综合机械化采煤工作面安全生产,在掌握采面矿山压力显现规律的基础上,选择ZZ9900/29.5/50支撑掩护式液压支架控制采场顶板,针对两硬特点,8402大采高工作面选择自然垮落结合人工强制放顶技术控制顶板,取得了良好的技术经济效益,为同煤集团公司其它条件类似采面提供了可靠的顶板控制技术和管理经验。     

振兴水泥厂石灰石均化库钢结构折线型86m大屋架的安装

振兴水泥厂石灰石均化库钢结构８６ｍ跨折线型大屋架，设计新颖，造型独特，吊装方案科学、严谨、合理、经济，为本市近二十年来，独具特色的吊装工程之一。对今后钢结构大跨度的吊装工程，具有良好的参考价值。     

屋顶花园构造及几个关键环节的处理

从屋顶花园的构造出发,结合屋顶花园的功能、国内外发展现状和趋势,讨论和阐述了屋顶花园建设过程中荷载、培养基质、防水防风和使用安全等几个关键环节出现问题的原因,提出了解决这些问题的对策。     

浅谈屋面渗漏的原因及其控制措施

根据有关的理论研究和分析资料介绍了土建工程的屋面渗漏的主要原因,并结合施工单位及监理单位的实践经验,提出了适合于中国国情的解决屋面渗漏的质量控制措施的思路     

大倾角煤层仰斜开采顶板管理问题的研究

根据张庄煤矿开采实践，分析了在煤层倾角较大条件下，采用炮采仰斜开采时工作面顶板管理产中存在的支柱的迎山角、初撑力与工作阻力、支拄钻底、工作面支架稳定性、工作面煤壁片帮、上下端头支护等问题，提出了技术管理措施。