边坡稳定可靠度分析的并行随机有限元方法

将Monte-Carlo随机方法与并行有限元方法结合,设计了基于PC机群的并行随机有限元算法,每一次随机模拟产生一个随机场,作为一个样本,代入有限元进行稳定性计算,发挥并行有限元计算量大、计算速度快的特点,克服了Monte-Carlo方法计算时间长的缺点。用C++语言结合MPI消息传递接口开发了相应的计算软件,计算了1 000个随机样本的边坡可靠度问题,验证了程序的可靠性及高效性。     

软件工程中并发测试的研究与实践

随着计算机技术和Internet的发展，相对于以前的单机版的应用软件，目前已有众多的网络版应用软件犹如雨后春笋，不断的涌现出来，这对传统的测试方法和理论提出了新的挑战。这里重点介绍了基于Internet网络版应用程序的并发测试方法研究与技巧，提供了一些实践经验，总结了在并发测试时应该注意的一些实际问题。     

油压夯管技术及油压夯管设备的研究

在阐述油压夯管技术及特点的基础上,说明了油压夯管锤结构及工作原理,建立了油压夯管锤数学模型,进行了较深入的内部工作华而不实结构参数的优选,介绍了油压夯管设备的研制内容及过程。     

基于CUDA技术的矿产储量计算

插值计算是矿产储量计算中的重要环节,但由于计算量大,经常需要在插值密度和计算时间之间进行权衡。本项研究通过最新的CUDA技术,将插值运算转换到显卡上进行并行化计算,极大地提高了计算速度。以紫金山铜矿数据为研究对象,进行了方法技术的实验,与基于CPU的计算相比,基于GPU下CUDA的计算速度提高了67倍。     

Computation of Probabilistic Seismic Hazard for the GHSAP Test Area ‘Caucasus’

As a result of work carried out during the first two stages of the Global Seismic Hazard Assessment Program (GSHAP) for the Test Area Caucasus, a uniform earthquake catalogue was compiled and a Seismic Source Zones Model was designed. At the final stage of the program, the computation of seismic hazard was done by different methods.The results of a computation done using the Probabilistic Seismic Hazard Assessment methodology, as well as primary intermediate steps and preparatory work are given in the present paper. Peak horizontal ground acceleration is chosen as the parameter representing seismic hazard. Final computer calculations were done with the SEISRISK III program. The two final Seismic Hazard maps for different return periods are presented. The work was carried out at the National Survey for Seismic Protection of the Republic of Armenia.     

双线并行隧道施工中影响地表沉降的因素分析

近年来为满足规划、平面线型要求,受地形、地质、地面构筑物的影响,双线地铁隧道呈迅猛增加的趋势。且大多数地铁区间隧道中,通常在同一埋深地层平行修筑两条隧道。广州轨道交通5号线淘金―区庄区间隧道具有穿越地层复杂、隧道断面、间距、埋深均随里程而变化的特点。两条隧道的开挖将导致地表沉降相互影响,沉降预测更加困难。在概化地质模型的基础上,利用反演得到地层参数,选择典型隧道断面及地质剖面,采用数值方法分析不同间距、隧道埋深以及地层情况对地表沉降的影响。得出一定的规律,预测隧道施工引起的地表沉降,以指导实际工程的安全施工。     

盾构法隧道施工对邻近摩擦单桩影响的研究

采用对隧道洞室周边及开挖面的土体施加由盾构机引起的各种荷载的方法模拟盾构施工,通过变化隧道埋深、隧道数量及开挖顺序研究盾构法开挖隧道对邻近摩擦单桩的影响。计算结果表明,隧道与桩的水平距离不变时,隧道埋深存在一个临界值,当隧道埋深为此临界值时隧道开挖引起的桩顶沉降、桩身侧移最大;隧道埋深较小时,隧道开挖会使桩产生较小的上移;隧道与桩的水平距离缩小相同值时,隧道埋深越小,开挖引起的桩顶沉降增加量越大;双隧道开挖引起的桩顶最终沉降量大于单隧道开挖引起的桩顶最终沉降量;双隧道同时开挖引起的桩顶沉降量、桩顶最大侧移大于双隧道先后开挖引起的桩顶沉降量、桩顶最大侧移;无论是同时开挖还是先后开挖,垂直双隧道引起的桩顶沉降量明显小于平行双隧道引起的桩顶沉降量。     

Three‐dimensional beam‐truss model for reinforced concrete walls and slabs – part 1: modeling approach,validation, and parametric study for individual reinforced concrete walls

A three‐dimensional beam‐truss model for reinforced concrete (RC) walls developed by the first two authors in a previous study is modified to better represent the flexure–shear interaction and more accurately capture diagonal shear failures under static cyclic or dynamic loading. The modifications pertain to the element formulations and the determination of the inclination angle of the diagonal elements. The modified beam‐truss model is validated using the experimental test data of eight RC walls subjected to static cyclic loading, including two non‐planar RC walls under multiaxial cyclic loading. Five of the walls considered experienced diagonal shear failure after reaching their flexural strength, while the other three walls had a flexure‐dominated response. The numerically computed lateral force–lateral displacement and strain contours are compared with the experimentally recorded response and damage patterns for the walls. The effects of different model parameters on the computed results are examined by means of parametric analyses. Extension of the model to simulate RC slabs and coupled RC walls is presented in a companion paper. Copyright © 2016 John Wiley & Sons, Ltd.     

L波段测风雷达探测应注意的问题

正确选取对比观测的时间,观测前做好经纬仪的水平、方位、焦距的调整,提高经纬仪的观测精度,确保经纬仪观测与雷达观测的误差的精确度,进一步确保雷达观测的精度,保证高空气象资料的准确性。