【摘 要】
：
Restricted to size of access tunnel,ducts and power of ventilation equipment,dust,carbon oxides and nitrogen oxides heap up after tunnel blasting,especially in the case of multi working faces being co
论文部分内容阅读
Restricted to size of access tunnel,ducts and power of ventilation equipment,dust,carbon oxides and nitrogen oxides heap up after tunnel blasting,especially in the case of multi working faces being constructed simultaneously in the underground LPG storage cavern group engineering.In order to solve this urgent problem,gallery-type network ventilation technique(GNVT),refined from theories of operation ventilation for road tunnel and mining ventilation network,is proposed to conduct construction ventilation in this paper.Taking advantages of shafts and tunnels as air ducts,GNVT takes in fresh air from one outcrop and exhausts dirty wind from the other outcrop,which allows air to circulate effectively.As an advisable and economic construction ventilation method,it is first applied in Jinzhou underground LPG storage project.The results turn out that GNVT not only saves costs of middle construction ventilation shafts and traditional air ducts,but also offers convenience to construction.
其他文献
The dynamics of a two-span continuous bridge with uniform cross sections under a moving force are studied analytically by Modal Superposition(MS)method combined with the approximated modes of the brid
沌口长江公路大桥是目前长江上首座特大跨径8 车道钢箱梁斜拉桥，主梁宽度达46m.以该桥为背景建立梁壳混合有限元模型，分别研究主梁在恒、活载作用下的剪力滞效应沿纵向的分布规律.研究表明，考虑剪力滞影响后，塔梁交汇区、辅助墩区主梁应力控制结构设计，设计应重点关注.研究结果为拓展宽幅钢箱梁斜拉桥的应用提供参考.
The hot gas induced by the fire in naturally ventilated tunnels is exhausted from the vertical shaft due to the buoyancy,the behaviour of which is significantly different from the smoke development in
A smart SHM system with 46 sensors installed at 15 floors of the 492 m high Shanghai World Financial Center(SWFC)in China was developed.The efficiency of the system was validated through the analysis
本文依托“一带一路”标志性项目——中马友谊大桥工程。基于三维势流理论,采用流体动力学软件SESAM,对主桥20＃墩承台基础波浪荷载展开研究,计算不同波浪周期、承台吃水、浪向角情况下的承台荷载,分析承台波浪荷载的变化规律。通过物理模型试验,对部分数值模拟结果进行验证。相关结论对现场施工有重要意义。
To meet the current needs of urban blasting engineering automatic monitoring,we designed an automatic blasting-vibration monitoring system based on a TC6850 network blasting-vibration measuring instru
以宁波舟山港的一座大跨度双塔单索面变宽度组合梁斜拉桥(57+108+340+108+57)m 为工程背景，该桥主梁宽高比大，主梁构造复杂，剪力滞效应显著。为研究该斜拉桥剪力滞效应及主梁变宽对剪力滞效应的影响，采用梁－壳－实体混合有限元方法分析了主梁局部构件的主要力学行为和应力分布特征，进一步分析了主梁顶、底在成桥状态下的应力和剪力滞系数分布。分析结果表明，斜拉桥单箱三室主梁截面顶、底板剪力滞效应显
In this paper,the non-linearity of the gravelly and clayey soils in Japan is investigated based on KiK-net down-hole array seismic observations.Shear modulus reduction ratios at 18 sites under 165 str
作用在公路桥梁上汽车荷载效应具有高度随机性，为改善对汽车荷载效应样本的统计拟合，采用广义极值分布适线法拟合车辆荷载效应区间最大值样本。通过建立均值、偏差系数和变差系数与广义极值分布的形状参数、尺度参数和位置参数的一一对应关系，建立了广义极值分布适线法，通过实例验证，在样本数量较少时，适线法结果优于最大似然法。采用广义极值分布适线法拟合汽车荷载效应样本分布更能反映超重车辆荷载效应的影响。
Based on ANSYS FLUENT,a fluid-structure interaction(FSI)model has been developed to investigate the limit cycle flutter(LCF)characteristics of a bridge deck.Its accuracy is verified by simulating the