龙厦铁路象山隧道岩溶区段施工技术研究

研究目的:龙厦铁路象山隧道DK 24+083～DK 24+232和YDK 24+098～YDK 24+304段为半封闭岩溶洼地,周边为花岗岩、砂岩全风化地层。溶洞、溶槽、管道相互连通,形成一个巨大的储水构造。隧道采取全断面帷幕注浆后,开挖时发生大规模突水突泥,造成淹井灾害,地表坍陷。通过地表施作洞内"透水不透泥"堵水塞,完成进口端反坡安全抽水。随后对岩溶区段采取信息化综合注浆技术,采取"两端夹击、泄水降压、注浆加固、管棚支护"完成溃口处理。研究结论:(1)通过地表深孔投料注浆,可以实现"透水不透泥"堵水塞结构的施作;(2)信息化综合注浆技术在满足质量的基础上,比全断面帷幕注浆施工速度提高1倍以上;(3)采取"两端夹击、泄水降压、注浆加固、管棚支护"的施工原则,成功地处理了突水突泥溃口。     

甘肃省交通行业重点发展领域人才现状与对策

本文结合甘肃省交通行业重点发展领域的实际情况,介绍了道路运输行业及农村公路建设养护部门人才队伍的现状,指出其中主要存在的问题并且提出了具体的对策和建议.     

Experimental study of drillship resistance performance in open and closed state of moonpool北大核心CSCD

[Objective] This paper carries out an experimental study of a multi-function dirllship model with moonpool structure in towing tank, aiming at analyzing the effects of the moonpool structure on the ship resistance in open and closure condition.[Methods]Taking a dirllship as the research object, the ship motion response in regular and irregular waves is investigated. The resistance of the ship in hydrostatic water and waves is measured with tension sensors, and the acceleration characteristics of the bow, midship and stern are analyzed by acceleration sensors.[Results]The results indicate that hull resistance under light load conditions is greater when open moonpool, while hydrostatic water resistance with closed moonpool is greater under design load conditions. The closed moonpool in regular waves reduces stern acceleration by 58.2%, bow resistance by 46.7% and heave response by 41.8%. The peak of resistance at the bow in irregular waves is about ten times higher than that at the stern, and the peak of resistance occurs more often when the moonpool is open at the same time.[Conclusions]The experimental study shows that the difference in load conditions changes the waterplane area and affects the hull resistance in hyrostatic water. In contrast, the closure of the moonpool not only reduces acceleration and resistance, but also improves surge and heave. As such, this paper can provide references for the structural design of drillships with moonpools. © 2023 Journal of Nanjing Agricultural University. All rights reserved.     

中心城某雨水泵站及初雨调蓄池提质增效探索

国家高度重视水污染工作，面对城市排水泵站的放江水质差的问题，上海规划新建设一批初雨调蓄池。泵站及调蓄池的设计应在进一步削减污染排放、充分对调蓄池内雨水处理和回用、最大程度综合利用土地等方面思考。以上海市中心城区某全地下排水泵站及初雨调蓄池为例，通过泵站海绵化改造、调蓄雨水就地处理、回水全面利用（喷泉景观补水、绿化浇灌、道路清洁）、景观提升开放等全方位改造，探索城市排水系统末端设施提质增效的方式方法。     

一种船体分段翻身架发明设计

针对用传统吊装翻身的方法吊装薄板立体分段的诸多弊端，设计一种船体分段翻身架，解决开放式薄板立体分段翻身变形问题，保证薄板立体分段的精度要求，特别适用于豪华邮船分段建造，同时适用于其他类型船舶分段的翻身。