水泥、石灰稳定土施工工艺

青银高速公路沿线所征用的土场中，大部分土为低塑指土。经多次试验，这种低塑指土适用于水泥稳定或水泥、石灰综合稳定，针对此种情况，有必要在施工中对其采用科学、合理的施工工艺。     

软土地下建筑物地震易损性分析

提出了软土地下建筑物地震易损性的分析的思路.根据软土结构动力反映理论,建立易损性分析的动力模型,结合场地的地震危险性分析得到的地震设防标准和动力参数以及结构抗震性能参数,进行软土结构动力分析.利用累积损伤模型进行软土地基液化概率分析,根据液化概率判断地基液化破坏等级.采用JC拟静力方法进行结构抗震失稳的动力可靠性分析,根据失效概率判定结构抗震失稳破坏等级.     

三维植被网路基边坡防护工艺

三维立体植被网作为一种塑料新型的坡面防护材料问世,它具有较好的使用性能和推广价值,本文中突出介绍了其结构特点及施工工艺等内容。     

溶剂法回收利用聚苯乙烯泡沫塑料技术研究

采用优选配方的复合溶剂对泡沫塑料进行回收再利用，经红外光谱分析，回收成品为聚苯乙烯，回收过程速度快，能耗低，所用溶剂回收率高，并可循环使用。     

Cyclic plastic deformation of overbend pipe during deepwater S-lay operation

In deepwater S-lay operations, the combined influences of stinger curvature, axial tension and roller support force can induce very large plastic deformation in the pipe. Dynamic loads from vessel motion and pipe sliding down the stinger lead the cyclic plastic deformation. This paper investigates the cyclic plastic stress history of the overbend pipe subjected to the dynamic pipelaying loading. The dynamic roller support forces are obtained through an innovative large scale hybrid substructure experiment constructed to simulate the pipe-stinger impact behavior. The measured roller forces are used to verify a 3D finite element analysis results developed with ABAQUS/Standard to observe the dynamic pipe stress history. The results confirm that the roller support can induce stress concentration in the pipe and the combined dynamic pipelaying loadings can cause extensive cyclic plastic deformation.     

STUDY ON PARISON CAD OF PLASTIC CONTAINER AND DESIGN FOR ITS CONTROL SYSTEM

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An investigation on flexible pipes birdcaging triggering

An investigation on triggering mechanisms for the birdcaging failure mode of flexible pipes, used in offshore oil and gas production, is carried out. From previous experimental observations, a conjecture is made: the local axisymmetric instability of the external plastic layer, caused by the high radial loading which is internally applied due to the helical armor wires tendency to expand when the pipe is subjected to compression, would be this trigger. A simple instability onset criterion for the external plastic layer, namely, the polymer intrinsic yielding limit stress, is proposed and assessed, analytically, numerically and experimentally for HDPE tubes. Then, previous birdcaging experimental observations are investigated further, focusing on the flexible pipe external plastic layer, to assess the proposed criterion. Strong evidences of validity are obtained.     

强度折减有限元法分析码头岸坡稳定

岸坡稳定问题一直是工程技术界很关心的研究课题。至今,已出现了较多的岸坡稳定分析方法,如极限平衡法、有限元法等。文中就采用有限元法中的强度折减法对某码头岸坡土体的稳定性进行了分析,土体采用弹塑性D-P屈服准则,并考虑了多层土的存在,最终给出该码头岸坡土体的稳定安全系数、土体应力、塑性区和位移场。其分析获得的土体应力、塑性区和位移场是按传统极限方法进行分析所无法得到的。     

轮载下车辆甲板塑性承载能力利用程度研究

目前针对车辆甲板,各船级社的板厚设计已经考虑了塑性承载能力,但塑性承载能力的利用程度并没有明确说明.本文采用数值模拟方法,依据各船级社规范,选取有代表性的车辆甲板货物载荷进行板厚设计,考察了设计板厚下板格的应力水平及离散程度;结果表明计算板格最大应力均值都大于弹性许用应力,而且超过了材料的屈服应力.最后从应力水平角度出发,分析了车辆甲板考虑塑性承载能力的程度.     

论塑料排水板处理软土路基施工工艺

塑料排水板具有较多的优良性能,是软土加固工程理想的排水固结材料。通过介绍该工艺施工设备的选用、施工前的准备工作、施工工艺的实施与技术标准的控制及施工中应注意的问题,以期为工程技术人员提供参考和借鉴。