Effect of sediment on vertical dynamic impedance of rock-socketed pile with large diameter

Based on the fictitious soil pile model, the effect of sediment on the vertical dynamic impedance of rock-socketed pile with large diameter was theoretically studied by means of Laplace transform technique and impedance function transfer method. Firstly, the sediment under rock-socketed pile was assumed to be fictitious soil pile with the same sectional area. The Rayleigh-Love rode model was used to simulate the rock-socketed pile and the fictitious soil pile with the consideration of the lateral inertial effect of large-diameter pile. The layered surrounding soils and bedrock were modeled by the plane strain model. Then, by virtue of the initial conditions and boundary conditions of the soil pile system, the analytical solution of the vertical dynamic impedance at the head of rock-socketed pile was derived for the arbitrary excitation acting on the pile head. Lastly, based on the presented analytical solution, the effect of sediment properties, bedrock property and lateral inertial effect on the vertical dynamic impedance at rock-socketed pile head were investigated in detail. It is shown that the sediment properties have significant effect on the vertical dynamic impedance at the rock-socketed pile head. The ability of soil-pile system to resist dynamic vertical deformation is weakened with the increase of sediment thickness, but amplified with the increase of shear wave velocity of sediment. The ability of soil pile system to resist dynamic vertical deformation is amplified with the bedrock property improving, but the ability of soil-pile system to resist vertical vibration is weakened with the improvement of bedrock property.

Case analysis of piled raft socketed in weak rock

Piles socketed in soft rock were traditionally regarded as end bearing piles, and the loads transferred from superstructure were assumed in design to be shouldered totally by the piles. This paper was designated to deal with the interaction between the piles socketed in weak rock and surrounding soil through field measurement. The pile head reaction and ground pressure under piled raft foundation were monitored, respectively. The analysis of the data measured in situ shows the characteristics of the pile embedded in weak rock are similar to that of friction pile to some extent. The rock socketed pile, together with the surrounding soil, shoulders the weight of the superstructure. It is suggested that soil bearing should be considered in designing the soft rock socketed piles, which can make the design more economical.

Discussion on“Empirical methods for determining shaft bearing capacity of semi-deep foundations socketed in rocks”[J Rock Mech Geotech Eng 6(2017)1140-151]

A new comprehensive set of data（n = 178） is compiled by adding a data set（n = 72） collected by Arioglu et al.（2007） to the data set（n = 106） presented in Rezazadeh and Eslami（2017）. Then, the compiled data set is evaluated regardless of the variation in lithology/strength. The proposed empirical equation in this study comprises a wider range of uniaxial compressive strength（UCS）（0.15 MPa 〈 σ_（rc） 〈156 MPa） and various rock types. Rock mass cuttability index（RMCI） is correlated with shaft resistance（r_s） to predict the shaft resistance of rock-socketed piles. The prediction capacity of the RMCI versus r_s equation is also found to be in a fair good agreement with the presented data in Rezazadeh and Eslami（2017）. Since the RMCI is a promising parameter in the prediction of shaft resistance, the researchers in the rock-socketed pile design area should consider this parameter in the further investigations.

Empirical methods for determining shaft bearing capacity of semi-deep foundations socketed in rocks

Semi-deep foundations socketed in rocks are considered to be a viable option for the foundations in the presence of heavy load imposed by high-rise structures, due to the low settlement and high bearing capacity. In the optimum design of semi-deep foundations, prediction of the shaft bearing capacity, rs, of foundations socketed in rocks is thus critically important. In this study, the unconfined compressive strength(UCS), qu, has been applied in order to investigate the shaft bearing capacity. For this, a database of 106 full-scale load tests is compiled with UCS values of surrounding rocks, in which 34 tests with rock quality designation(RQD), and 5 tests with rock mass rating(RMR). The bearing rocks for semi-deep foundations include limestone, mudstone, siltstone, shale, granite, tuff, granodiorite, claystone, sandstone, phyllite, schist, and greywacke. Using the database, the applicability and accuracy of the existing empirical methods are evaluated and new relations are derived between the shaft bearing capacity and UCS based on the types of rocks. Moreover, a general equation in case of unknown rock types is proposed and it is verified by another set of data. Since rock-socketed shafts are supported by rock mass(not intact rock), a reduction factor for the compressive strength is suggested and verified in which the effect of discontinuities is considered using the modified UCS, qu(modified), based upon RMR and RQD in order to take into account the effect of the rock mass properties.

基于Socket接口的局域网聊天系统设计

文章在对TCP/IP通信协议研究的基础上,设计一种基于Java平台的局域网即时聊天系统,系统利用Wi-Fi局域网络,采用C/S框架,各Java客户端基于Socket传输文本消息,能够实现注册、登录、在线聊天以及离线消息获取等功能。本系统还采用了多线程技术实现多客户端与服务器的并发式通信,能有效地提高网络资源利用率,以此来缓解服务器的通信压力。

一种基于Socket通信的嵌入式设备测试方案

嵌入式设备的一个主要特征就是其对高实时性的要求。这样嵌入式测试程序就无法在传统的非实时操作系统上运行,而是需要运行在一款实时操作系统上,因此,在嵌入式测试人机交互界面上易用性方面就会受限。目前主流的方案是测试程序采用上位机加下位机分离的体系结构来解决操作和可视问题。研究了一种基于Socket通信的嵌入式设备自动化测试方案,解决了上位机加下位机测试结构上的通信难题。

Superior rectus/levator complex in acquired anophthalmic socket repaired with spheric implant—a computed tomography scan and topographic study

AIM:To determine whether the levator palpebrae superioris(LPS)/superior rectus(SR)muscle complex,can influence the position of the upper lid and fornix in acquired anophthalmic sockets.METHODS:This comparative non-randomized and non-interventional study included retrospective data of 21 patients with unilateral acquired anophthalmic sockets repaired with spheric implants.High-resolution computed tomography(CT)measurements of the LPM/SR muscle complex and clinical topographic position of the upper lid,superior and inferior fornix depth in primary gaze position were evaluated.Demographic data were presented as frequency and percentage proportions and quantitative variables comparing the socket measurements with the normal contralateral orbit was statistically analyzed using non-parametric tests considering P<0.05.RESULTS:The anophthalmic orbits had a significantly shorter LPS length(P=0.01)and significantly thicker SR(P=0.02)than the normal orbit.Lagophthalmos was present in anophthalmic sockets but not in normal orbits(P=0.002),while levator function was normal in both(P>0.05,all comparisons).The superior fornix depth was similar in the anophthalmic socket and the contralateral normal orbit(P=0.192)as well the inferior fornix depth(P=0.351).CONCLUSION:Acquired anophthalmic sockets repaired with spheric implants have shorter LPS,thicker SR,and more lagophthalmos than normal orbits.The relationship of the LPS and SR with other orbital structures,associated with passive or active forces acting in the final position of the lids and external ocular prosthesis should be further investigated.

基于IPv6的Socket网络编程接口技术与实现

本文主要探讨基于互联网协议第6版(Internet Protocol Version 6,IPv6)的Socket网络编程接口技术与实现。首先介绍了IPv6和Socket编程的基础知识,分析了IPv6环境下Socket编程的特点与关键技术。然后讲述了基于IPv6的Socket网络编程接口的实现过程,包括环境搭建、客户端与服务器端的编程实现。最后进行了性能测试与优化分析,为IPv6网络环境下的Socket编程提供了理论与实践的参考。

基于Socket编程的实时网络通信系统设计与实现

在电力通信系统中,实时网络通信是确保数据传输高效和稳定的重要环节。Socket编程作为一种底层网络通信技术,广泛应用于各种实时通信场景。文章详细分析传输控制协议(Transmission Control Protocol,TCP)和用户数据报协议(User Datagram Protocol,UDP)在Socket通信中的应用,并设计了基于Socket编程的实时网络通信系统,介绍了系统的架构设计、多线程并发处理、网络延迟优化等关键技术。经过对比实验,验证了该系统在带宽、延迟、丢包率以及并发处理能力方面的优越性能。

基于Socket和多线程的远程监控系统

探讨了基于Socket以及多线程技术的远程监控系统的设计和实现,介绍了系统设计的总体方案,并在VC++6.0编程环境下实现了一种基于局域网的监控系统。Socket套节字作为目前最流行的网络通信应用程序接口之一,利用它可以方便地实现局域网内的数据传输。传统的单线程程序中,视频数据的编码、解码、传输不能同时进行,导致传输效率很低。为此,提出了多缓冲区多线程结构,有效地提高了视频数据的传输效率。实验证明,系统能有效地实现一点对多点的实时监控。

面向物联网应用平台的Socket设计与优化

在物联网平台的通信层,利用缓冲池、线程池建立多线程并发连接,提出一种高效Socket服务器设计方案,在应对大量的用户和数据请求的同时,最大限度地减少系统开销和缓存的使用。仿真结果表明,引入线程池和缓冲池的Socket服务器可减少线程的创建和销毁时间以及客户端阻塞时间,减少线程的动态生成和销毁过程,从而增强服务器的处理能力。

基于Socket网络编程的局域网上的计算机与MPC860之间的通信

主要介绍了TCP/IP协议下的Socket网络编程及其应用模式，并给出了一个利用它在局域网上成功的实现计算机与MPC860之间通信的实用研究，提出了计算机与MPC860之间通信时的一些特殊问题的解决方案。

基于客户/服务器模式的Socket网络编程

介绍了TCP/IP的Socket接口标准和它的应用模式—客户／服务器模式，并给出了利用Socket开发网络应用程序的基本方法。

远程测控数据传输中的DataSocket技术应用

作为一种新的网络通讯编程技术,DataSocket是利用虚拟仪器技术构建远程、分布式网络测控系统的核心技术之一.DataSocket以TCP/IP为基础,支持多种协议,并对底层进行了高度封装,大大简化了同一台计算机上的应用程序,通过网络实现不同计算机上的动态数据交换.其独特之处在于:为自动化测量应用程序提供了一个易学易用,性能较高的编程接口,实现数据的实时发布和共享.以LabVIEW作为虚拟仪器软件开发平台,基于DataSocket技术组建远程测控系统并利用先进的浏览器技术进行试验,取得了成功,实现了真正意义上的远程测控.

Linux下多线程Socket通讯的研究与应用

Linux操作系统具有良好的稳定性和出色的网络性能,因此被广泛应用于网络服务领域。而在Linux下开发高性能的网络通讯程序,是充分发挥Linux网络特性的一个关键因素。文章通过对Socket通讯模型的分析和比较,阐述了在大规模分布式系统中采用多线程Socket通讯技术的必要性。并且以HT-7数据采集和控制系统中的炮号服务器为例,详细说明了如何在Linux下利用多线程Socket通讯技术进行网络通讯程序的开发。

基于Socket通讯模式下的跨平台数据同步

对当前跨平台数据同步的几种方法进行综合评价 .在企业安全策略的前提下 ,给出了一种基于 C/S模式的 Socket通讯系统框架 ,并给出了在 Intranet自动化工具中的实现方法 .该方法充分利用了 Socket技术的特点和优势 ,客户端发送需要更新的字段名称 ,服务器端利用已有的数据库查询工具完成查询操作 ,返回新的字段内容 .本地应用程序将接收到的新的字段内容对所需要与远端同步的数据库进行数据更新 。

Socket 编程技术

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Java中基于TCPIP的Socket编程

Socket是基于TCP IP的网络上运行的两个程序间双向通讯的一端 ,java.net包中包含Socket类 ,用以快速地开发网络通信程序。通过实例模型探讨基于Java的Socket通信程序的一般结构。对开发一般性的通信软件 ,有一定的参考价值。

SOCKET通信程序模型抽取及可靠性验证

形式化方法是验证并发系统可靠性和安全性的重要手段。对高级语言开发的并发系统自动抽取的模型进行形式化验证是模型检测技术领域中的一个研究热点。鉴于socket函数调用顺序不正确产生的运行时潜在问题(内存泄漏、死锁、边界数据丢失等),针对顺序结构的socket程序,通过描述Promela消息数据结构和通道,构建socket函数的Promela模型,定义socket函数到Promela映射规则,提出socket函数调用序列抽取算法及目标Promela模型生成算法,用线性时态逻辑(LTL)刻画socket函数调用顺序应满足的性质,开发基于SPIN的socket通信程序分析系统。实验结果表明,该系统能有效检测socket通信程序的运行时潜在问题。

基于OpenCV与Socket的网络视频监控系统设计与实现

为了降低开发视频监控系统的成本与时间,提出一种新的、可行的网络视频监控系统方案。该系统使用OpenCV与Socket编程实现,采用的是客户机/服务器(C/S)模型。客户端请求进行视频监控并对视频流图像接收、显示;服务器端采用多进程编程满足多客户的监控请求并将采集到的视频图像以视频流的方式发送到客户端。实验结果表明该系统设计极大降低了视频监控系统的开发时间与开销。