共查询到20条相似文献,搜索用时 359 毫秒
1.
2.
大梁山隧道是浙江金丽温高速公路线上地质最复杂的隧道,隧道出口掘进至K3+020时遭遇岩溶涌水突泥,导致开挖面被淹,严重影响了正常施工,通过地质钻探等综合预测预报手段并结合涌出物分析,决定采用全断面预注浆技术进行封堵,有效地堵住了地下水,并对围岩进行了加固,恢复了正常施工。 相似文献
3.
介绍了水下抛石断面快速检测系统的工作原理及组成,分析了该系统进行作业时外部数据采集、内部处理流程,并结合具体工程实例进行了应用,检测方案可行,结果正确。 相似文献
4.
5.
为提高河道断面测量精度,本次研究引入雷达探测技术,开展对其测量方法的设计研究。先合理选择GNSS、机载三维激光扫描仪等测量所需仪器设备,然后利用雷达探测技术实现机载激光雷达测量,最后根据测量结果完成对河道地层底界面深度的计算,并进一步实现对河道断面面积、体积的测定。以某水利工程项目为研究对象,将新的测量方法对其河道断面进行测量,得出结果误差较小,测量精度满足要求,具备极高的可行性。 相似文献
6.
湿喷碳素纤维混凝土在大断面黄土隧道中的应用 总被引:1,自引:0,他引:1
黄嶂3号隧道是新建太中银铁路全线最大断面黄土隧道,最大断面面积为193.73m^2,洞身穿越地层主要为老黄土,受黄土软弱性、离散性、湿陷性和膨胀性影响,洞周出现较大变形,造成喷射混凝土支护的破坏和失效。结合实际情况,选用碳素纤维作为湿喷混凝土的添加料,研究了配套施工工艺和质量控制方法。现场应用表明,湿喷碳素纤维混凝土能够减少喷射混凝土的回弹率,改善洞内施工环境,有力保证喷射混凝土的质量并提高喷射混凝土的残余强度。此项技术在隧道施工中起到了积极的作用,对类似工程有较强的借鉴意义。 相似文献
7.
本文以普光气田刘家坡隧道为例,针对特长小断面大坡度管道隧道特点,通过隧道中部增开平洞,减小施工难度,采用光面爆破、卷扬机有轨运输、小型挖掘机顺坡扒渣,洞内反坡排水,泵送混凝土等一系列措施,有效解决了隧道施工过程中的各种难题。 相似文献
8.
《中国水运》2019,(9)
本研究之目的在于揭示隧道断面的几何形状对隧道抗震力学性能的影响。以某高烈度地震区浅埋公路隧道洞口段作为研究对象,建立了地震荷载作用下洞口段动力响应的有限元数值分析模型,对不同断面形状隧道衬砌的抗震力学性能进行比较研究,实现隧道设计断面的优选。研究选择了三心圆、四心圆、扁四心圆以及尖四心圆加等四种断面进行比较分析,并采用ABAQUS软件进行建模。研究结果表明:在地震荷载作用下,隧道采用不同断面形式所产生的位移响应值相差很小;而衬砌内力的差异明显,其中三心圆断面的受力情况最优,而四心圆和尖四心圆的受力状况较差。隧道断面越接近于圆形,能够有效改善地震荷载作用下的隧道受力状况。 相似文献
9.
10.
11.
12.
对上海洋港区 2 0 0 0 - 0 1~ 2 0 0 1- 0 1固定断面实测水深资料进行了整理分析 ,得出以下结论 :该海区夏秋季冲刷 ,冬春季淤积 ,全年冲淤平衡略有淤积。根据对实测资料的整理分析 ,进一步提出了封堵小洋山~镬盖塘汊口的必要性 相似文献
13.
修造船分段制作过程中的生产工艺是保证生产顺利进行,不发生安全事故的技术保障。文章从修造船小组立制作过程中最为重要的起重吊装和装配工艺技术两方面,举例介绍工艺技术在安全生产中的重要作用。 相似文献
14.
15.
沉管管节预制是沉管隧道工程的重要环节。文章介绍4种不同混凝土管节预制方式及工程应用实例,结合港珠澳大桥沉管隧道工程的实际情况,重点对干坞法和工厂法进行了深入比选研究,最后对港珠澳大桥管节预制实施方案提出建议。 相似文献
16.
17.
高墩大跨连续刚构桥墩项的截面形式既有空心截面,也有实心截面。通过对比研究,分析了某高墩大跨连续刚构桥墩顶分别采用空心、实心截面后墩顶部位的受力特点。结果表明,在满足设计规范的前题下,选择实心截面有利于满足主梁施工搭设托架,方便施工。 相似文献
18.
分析了隧道火灾报警领域几种常见的火灾探测技术的原理及其优缺点,包括双波长火灾探测技术、光纤喇曼散射感温火灾探测技术和光纤光栅感温火灾探测技术。后2种技术同属光纤传感技术,重点对这2种技术进行了比较,得出光纤光栅感温火灾探测技术更适合隧道火灾报警领域应用的结论。 相似文献
19.
M. K. Rahman
J. B. Caldwell
《Marine Structures》1992,5(6):467-490A rule-based overall design methodology for midship structures of small inland waterways vessels is presented. It is shown how the designer, under conflicting requirements, can select the optimum design by using a combined objective function with priority factors assigned to individual design criteria. The concept of optimization, in large-scale structural design problems, is extended to the local members (the stiffening elements) of the ship structure, so that the stiffeners can be specified by their actual dimensions instead of section moduli. The effects of price-structure (labour rate to material price ratio) and the choice of type of stiffener on design are investigated. Standard sections and optimized fabricated sections are taken as the alternative options for selecting the stiffeners. Conversion of exact mathematical optimum solutions into production-oriented designs is also demonstrated in a series of practical applications of the proposed method. 相似文献
20.
Using the SKAGEX dataset for evaluation of ocean model skills 总被引:1,自引:0,他引:1
Numerical ocean models are now being applied in numerous oceanographic studies. However, the qualities of the model results are often uncertain and there is a great need for standards and procedures for evaluation of the skills of numerical general circulation models. In this paper measurements from repeated hydrographical sections across Skagerrak taken in 1990, the SKAGEX dataset, are used to evaluate the skills of two σ-coordinate ocean models and to study the sensitivity of these models to model parameters. A methodology for quantification of model skills based on observations from repeated hydrographical sections in general is suggested. Area averages of absolute differences are for Skagerrak completely dominated by the discrepancies in the upper few meters of the ocean and may not be used to assess models' abilities to reproduce the fields in the larger and deeper part of the ocean. Therefore, discrepancies between average values in time from the observed fields and time averaged values from model outputs are related to the natural variability of the fields. The numbers produced with the suggested measure are relative numbers that will be specific for each section and for each series of observation. Ideally we would therefore like to see the measures computed for a number of sections for various models and choices of model parameters in order to assess model skills. The value of the SKAGEX dataset as a tool for model improvements is demonstrated. Evidence to support the importance of applying non-oscillatory, gradient preserving advection schemes in areas with sharp density fronts is given. The method is used to identify that the forcing/initial values/boundary values for the temperature field are inferior to the corresponding values for the salinity field. With the present coarse resolution, 11 layers in the vertical, it is shown that it is far from obvious that the quality of the model results improve when replacing simple Richardson number formulations for vertical mixing processes with higher order turbulence closure in the Skagerrak area. 相似文献