动静条件下隧道爆破建筑结构放大效应特征分析

为了对不同动静条件下隧道爆破地震波对高层建筑结构放大效应的影响情况进行探讨,基于实测数据建立的时程特征分析方法,建立以动静条件下隧道爆破-围岩-建筑结构多场耦合模型,对高层建筑结构放大效应的规律及结论进行探讨与分析。结果表明： 在动静条件下建筑结构的响应特征不相同,放大效应规律也不一样; 静条件下工况相比动条件下放大效应更为明显,而动条件下的放大效应规律更偏向于贴合实测情形且表现更为复杂化; 通过对建筑结构在不同动静条件下的放大倍数进行对比分析,单纯从岩性条件上来评价,可推测出较软围岩工况的放大效应相比较硬围岩工况更为强烈。     

鹞子岩瓦斯突出隧道揭煤工程防突设计

鹞子岩隧道于背斜核部、大断层附近连续六次穿过突出煤层,煤层厚度大、间距小,瓦斯压力大,兼有地下水影响,工程地质条件极其复杂,且为穿越中梁山脉的第一座瓦斯突出隧道,相关设计施工经验欠缺.本文以鹞子岩隧道为工程背景,本着"区域防突措施先行、局部防突措施补充"的指导思想,在充分探明煤层地质特征的基础上,系统制定了极复杂地质条...     

Spreading distinctive insignia benefits from mobile service: evidence from a mobile application of transportation

ABSTRACT

Mobile commerce (m-commerce) faces a growing array of client devices for which applications are designed. Applications developed for general consumer use must be compatible with a wide range of devices. This research investigates how perceived usefulness and enjoyment affect intention to use a mobile application service (T-Express). In this study, we formulate a commitment model from the perspective of the social identity and technology acceptance perspective. Empirical data were collected by conducting a field survey of users of T-Express from Taiwan High Speed Rail Corporation (THSRC) stations in Taiwan. The main findings of the study are that wireless technology provides great value to businesses when it allows consumers to access real-time data to make timely decisions that either decrease costs or increase revenues; and to achieve a higher intention to use mobile applications, there should be a clear communication process between mobile application and passenger. Our findings indicate that one of the more overt illustrations of the power of packaging symbolism involves package design strategies that serve to provide a radical new upscale positioning for the THSRC brand.     

嵌岩灌注桩模型试验几何相似常数的优化设计

模型比尺是模型试验的重要参数,决定了试验成果的精度、可靠性和模型试验的经费投入。通过对嵌岩灌注桩模型试验几何相似常数的优化设计,选定适用的模型比尺,为进一步确定模型桩的合理尺寸、极限承载力指标等参数提供依据。     

Nonlinear wave forces on large-scale submerged tunnel element

This paper presents parametric studies of nonlinear wave forces on large-scale submerged tunnel element. A transportation project of submerged tunnel element under irregular wave conditions is taken as the research background. Three-dimensional diffraction potential and radiation potential associating with the motion of the floating body are utilized, and an efficient three dimensional Green function is implemented to solve the radiation-diffraction problem. A computational method for calculating the nonlinear wave forces of the submerged tunnel element is developed. The present method is validated by the existed methods and experimental data, and good agreements are observed for all test models. The effects of wave parameters and structural parameters on the second-order nonlinear wave forces are studied. Results from the present study can provide valuable recommendations for the weather window and downtime frequencies, the configuration of tugboats, the arrangement of sea-route, and the size and type of the design and construction of the submerged tunnel element.     

不同降雨强度条件下的边坡稳定性分析

高深路堑开挖施工地质复杂,现场机械及人员较多。为了更为准确、详细可靠的分析边坡的稳定状态,实现对施工进度的有效调控,确保施工安全,本文以安徽某公路边坡开挖为工程背景,在室内进行了不同降雨强度条件下的模型试验。结果表明,发现降雨对此类边坡一定深度内的土体有影响,而对深层边坡土体影响不大,不同降雨强度条件下边坡均表现为稳固状态,未出现病害现象。     

中小跨径斜腿刚构式桥的性能特点、适用性和造型探讨

对结构形式相似的几种斜腿刚构式桥从其基本力学性能、特点和桥型构造等方面进行分析、比较 ,找出它们之间的相互联系和关系 ,并对各自的适用条件和造型作探讨     

向量优化问题的严有效解的最优性条件

在局部凸Hausdorff拓扑向量空间中,研究了集值映射向量优化问题的严有效解.首先,在广义锥次似凸集值映射下,获得了向量优化问题的严有效解的标量化的特性,最后,获得了带广义不等式约束向量优化问题的严有效解的Lagrange型最优性条件.     

连续梁桥施工控制浅析

连续梁桥建设成本经济,设计理念成熟,施工工艺完善,广泛应用于各类桥梁建设,其施工质量关系到大桥的安全和使用性能,在施工过程中,对桥梁进行施工监控已经必不可少.文章以扬州市宝应县境内3座连续梁监控为例,结合施工现场实际情况,介绍了连续梁桥施工监控计算和线形控制分析中的若干问题,为今后类似桥梁的建设提供借鉴.     

特殊地质条件下桥梁深桩基钻孔方法的选择

介绍了石家庄市仓安路跨铁路斜拉桥桥址处的地质构造、深桩基础的钻孔方法的选择,以及钻孔施工中出现的问题和解决方法。施工人员在钻孔受挫的困惑中经过不懈的探索和改进，逐步摸索到适合该地区的深桩基钻孔方法，可供同类地质条件施工借鉴。