裂隙围岩隧道开挖扰动效应分析

节理裂隙岩体隧道开挖具有围岩稳定性差、施工风险高、诱发涌水突泥可能性大等特点.基于离散元理论,以青坪隧道为工程背景,针对裂隙围岩隧道施工过程中的围岩变形机理展开了研究,分析了隧道开挖围岩扰动效应性.为实际工程提供了较好技术支持.     

专业重点课程建设探索与实践

重点课程是专业建设的有力支撑,充分发挥课程建设各要素的综合效益,对于加强适应任职岗位需要的专业建设具有积极意义。本文结合专业重点课程建设实际,从课程建设思路、阶段划分,建设实践三个方面,对课程建设的探索与实践进行了初步总结,为后续工作奠定基础。     

试验研究作用于准椭圆沉箱群墩上的不规则波波浪力（英文）

An experimental investigation of irregular wave forces on quasi-ellipse caisson structures is presented. Irregular waves were generated based on the Jonswap spectrum with two significant wave heights, and the spectrum peak periods range from 1.19 s to 1.81 s. Incident wave directions relative to the centre line of the multiple caissons are from 0° to 22.5°. The spacing between caissons ranges from 2 to 3 times that of the width of the caisson. The effects of these parameters on the wave forces of both the perforated and non-perforated caissons were compared and analyzed. It was found that the perforated caisson can reduce wave forces, especially in the transverse direction. Furthermore, the relative interval and incident wave direction have significant effects on the wave forces in the case of multiple caissons.     

二甲醚闪急沸腾喷雾的实验研究(英文)

The high-speed digital imaging technique is applied to observe the developing process of flash boiling spray of dimethyl ether at low ambient pressure, and the effects of nozzle opening pressure and nozzle hole diameter on the spray shape, spray tip penetration and spray angle during the injection are investigated. The experimental results show that the time when the vortex ring structure of flash boiling spray forms and its developing process are determined by the combined action of the bubble growth and breakup in the spray and the air drag on the leading end of spray; with the enhancement of nozzle opening pressure, the spray tip penetration increases and the spray angle decreases. The influence of nozzle hole diameter on the spray tip penetration is relatively complicated, the spray tip penetration is longer with a smaller nozzle hole diameter at the early stage of injection, while the situation is just opposite at the later stage of injection. This paper establishes that the variation of spray angle is consistent with that of nozzle hole diameter.     

流速可控式新型生态鱼道的概念设计与数值模拟

鉴于传统鱼道适用范围窄、引鱼措施不完善、过鱼种类单一以及鱼道淤沙问题严重等缺陷,提出了一种流速可控式新型生态鱼道的概念设计模型,并结合大型通用流体力学计算软件Fluent对该新型生态鱼道进行数值模拟仿真研究。结果表明:通过调整鱼道中可旋转式隔板与边壁的夹角角度,从而改变鱼道中水流的流速大小,进而满足不同洄游鱼类对不同水流流速的适应要求。     

直立式岸壁折角处泊位长度优化研究

随着船舶大型化的发展,运用《海港总平面设计规范》中直立式岸壁折角处船长系数计算大型码头泊位长度时,易造成一定的岸线资源浪费。在原规范制定思路的基础上,分析和推导了在不同角度、不同船型、不同靠泊状态下直立式岸壁折角处船船(岸)间距与船舶尺度的关系和规律;细化了折角处不对称靠泊情况下的船长系数取值。同时,结合实际操船经验对大型船舶在不同折角情况下的船长系数进行优化和修正,在保证船舶操船安全的前提下,适度减少折角处泊位的富裕长度,达到节约岸线资源的目的。     

船用双电枢直流电力推进系统的稳定性研究

为了解决船用双电枢直流推进系统的稳定性问题,本文首先介绍一型具体的船舶直流电力推进系统数学模型,对系统模型进行了分析,并确定系统的最佳控制器模式。在计算仿真的基础上,确定控制器的具体参数,通过仿真及系统试验验证了系统的稳定性及控制器参数的合理性。     

基于PBL-栓钉组合剪力键的钢-UHPC组合桁式拱桥节点拉拔性能研究

为研究概念设计的1000 m钢-UHPC组合桁式拱桥新结构中拱肋-腹杆节点构造形式、UHPC强度对节点拉拔性能的影响,及新型PBL-栓钉组合剪力键应用于拱肋-腹杆节点的有效性,设计制作缩尺比为1∶5的4种采用不同剪力键形式(1对PBL剪力键+2排栓钉、2对PBL剪力键+3排栓钉、2对PBL剪力键、3排栓钉)的拱肋-腹杆...     

西安市公共交通枢纽布局规划研究

针对西安市公共交通枢纽发展现状以及存在的问题,结合西安市综合交通体系规划,确定西安市公共交通枢纽的规划目标。比较和借鉴国内其他城市公共交通枢纽的分类方法,提出西安市公共交通枢纽的总体布局以及规模确定的方法和流程。     

桥涵工程施工监理要点分析

详细分析了桥涵施工过程中的监理要点,为桥涵施工中的监理工作提供参考。