采空区输气管道弹性变形分析

近年来输气管道工程的大规模建设,其不可避免地要通过一些煤矿采空沉陷区和地质构造复杂区域。煤矿采空沉陷区的地表移动变形必然会使上覆的输气管道发生变形、甚至破坏,因此,分析与预测煤矿采空区地埋输气管道的安全性具有重要意义。本文以西气东输一线为例,依据弹性理论分析计算,当管道下伏分别为土体和岩体时,输气管道破坏时的岩土体垮塌宽度,并统计在垮塌影响范围一定的条件下,岩土体垮塌宽度与管道变形及最小曲率半径之间的规律。结果表明,管道的弯曲变形与垮塌宽度之间呈递增关系。     

金州短水准观测和资料分析中的若干重要问题

对金州短水准观测和资料分析中常易引起争议或新出现的若干重要问题进行论论，其结果对跨断层形变测量具有普遍意义。     

Influence of earthquake ground‐motion duration on damage estimation: application to steel moment resisting frames

This paper presents an analytical study evaluating the influence of ground motion duration on structural damage of 3‐story, 9‐story, and 20‐story SAC steel moment resisting frame buildings designed for downtown Seattle, WA, USA, using pre‐Northridge codes. Two‐dimensional nonlinear finite element models of the buildings are used to estimate the damage induced by the ground motions. A set of 44 ground motions is used to study the combined effect of spectral acceleration and ground motion significant duration on drift and damage measures. In addition, 10 spectrally equivalent short‐duration shallow crustal ground motions and long‐duration subduction zone records are selected to isolate duration effect and assess its effect on the response. For each ground motion pair, incremental dynamic analyses are performed at at least 20 intensity levels and response measures such as peak interstory drift ratio and energy dissipated are tracked. These response measures are combined into two damage metrics that account for the ductility and energy dissipation. Results indicate that the duration of the ground motion influences, above all, the combined damage measures, although some effect on drift‐based response measures is also observed for larger levels of drift. These results indicate that because the current assessment methodologies do not capture the effects of ground motion duration, both performance‐based and code‐based assessment methodologies should be revised to consider damage measures that are sensitive to duration. Copyright © 2016 John Wiley & Sons, Ltd     

深圳市电信管线断面详查及图形数据库建设

以深圳市电信管线断面详查工程为背景,论述了电信管线断面详查的要求、方法、技术和内容,以将成果融入深圳市规划国土局地下管线管理信息系统为目标,讨论了电信管线断面图形数据库的设计与建立.     

Vision-based system of AUV for an underwater pipeline tracker

This paper describes a new framework for detection and tracking of underwater pipeline,which includes software system and hardware system.It is designed for vision system of AUV based on monocular CCD camera.First,the real-time data flow from image capture card is pre-processed and pipeline features are extracted for navigation.The region saturation degree is advanced to remove false edge point group after Sobel operation.An appropriate way is proposed to clear the disturbance around the peak point in the process of Hough transform.Second,the continuity of pipeline layout is taken into account to improve the efficiency of line extraction.Once the line information has been obtained,the reference zone is predicted by Kalman filter.It denotes the possible appearance position of the pipeline in the image.Kalman filter is used to estimate this position in next frame so that the information of pipeline of each frame can be known in advance.Results obtained on real optic vision data in tank experiment are displayed and discussed.They show that the proposed system can detect and track the underwater pipeline online,and is effective and feasible.     

唐山西郊地区地下水多年动态变化分析

唐山西郊地区有唐山赛德热电有限公司水源地及唐山自来水公司西郊水厂大张刘水源地,是唐山西部主要的生产用水及生活用水的供水水源地,各水源地现状主要开采层为第四系深层水及奥陶系岩溶水。通过对西郊地区多年地下水动态统计分析,水位基本上呈逐年下降态势,尚未对上覆第四系孔隙水、周围的农业用水构成较大影响。     

海底管道整体式止屈器性能研究与穿越压力预测

整体式止屈器可有效抑制海底管道屈曲传播并避免管道的大规模屈曲失效。为探究整体式止屈器的止屈特性,预测其穿越压力,利用ABAQUS软件建立有限元模型,分析了整体式止屈器厚度、长度、径厚比等参数对穿越压力和穿越形式的影响机制,揭示了整体式止屈器的止屈特性。研究结果表明:在平行穿越阶段,增加止屈器厚度、有效长度可明显提升穿越压力;而在垂直穿越阶段,穿越压力增长速率明显放缓。结合有限元模拟结果,拟合得到了整体式止屈器在不同穿越形式下的穿越压力预测公式,其相较于已有经验公式准确性更高,对整体式止屈器的设计和建造具有重要的指导意义。     

南三河沉管工程基槽开挖对海域水环境的影响

南三河沉管是鉴江供水枢纽工程中的一处跨海管道工程,管道基槽开挖会对周围海域水质产生影响。基于建立的二维非稳态水环境数学模型,利用同步水文水质监测数据对模型参数进行率定,并反演得到SS源强浓度,继而预测施工期SS对海域水环境的影响范围及程度。结果表明:距基槽中心50 m范围的SS源强浓度达到70 mg/L;SS会对基槽中心线上下游各700 m范围内的水域产生影响(增量≥10 mg/L),影响程度以挖槽为中心线向两侧递减。     

下翼缘摩擦式自定心钢框架梁柱节点抗震性能的数值模拟

介绍了一种新型的铜框架梁柱节点形式,其中预应力钢绞线提供了结构在地震作用下的复位功能（自定心）,设置在梁端下翼缘的摩擦件则为结构提供了耗能能力;介绍了下翼缘摩擦式自定心钢框架粱柱节点的构造和工作原理,以节点的低用反复加载试验结果为依据,利用面向对象的开放式计算程序OpenSees建立了节点的数值模型,并侧重于模拟节点在地震作用下的张开/闭合、自定心、摩擦耗能以及螺栓受剪等特性。由计算结果与试验结果对比可知,所建立的数值模型对节点的抗震性能具有良好的模拟效果。     

45Mn_2钻杆接头热处理工艺研究

探讨了４５Ｍｎ２钻杆接头的各种热处理工艺降综合机械性能，应用断裂力学优选最佳热处理工艺，并已投入生产。