oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 41 )

2018 ( 445 )

2017 ( 462 )

2016 ( 365 )

Custom range...

Search Results: 1 - 10 of 28209 matches for " ZHU Hehua "
All listed articles are free for downloading (OA Articles)
Page 1 /28209
Display every page Item
Natural neighbour method based on the algorithm of local search
基于局部搜索算法的自然邻接点方法

Cai Yongchang Zhu Hehua,
蔡永昌
,朱合华

力学学报 , 2004,
Abstract: 自然邻接点方法(NNM)采用自然邻接点形函数进行插值,其插值形函数具有严格定义,且与有限元形函数一样形式简洁、性能优良,因而避免了EFG法里难以准确施加位移边界条件和材料不连续条件等诸多主要困难.但是从形式上看自然邻接点方法仍然属于有网格的方法,其研究和应用受到了较大的限制.为了克服这个缺点,对于任意给定的数值积分点,提出了一种基于局部搜索自然邻接点的寻找算法对NNM进行改进.改进后的NNM与无单元伽辽金法(EFG)的插值和求解过程类似,兼具有EFG的真正无网格特性及NNM的便于处理边界和材料不连续条件等优点.所得计算结果表明,改进后的NNM的计算精度和计算时间与NNM相当,是一种比较理想的数值求解方法.
AN ADVANCED METHOD TO CALCULATE THE RESPONSE OF LAYERED HALFSPACE TO ARBITRARY INCIDENT SEISMIC WAVES
分析层状半空间对入射地震波响应的改进模型

Chen Qingjun,Zhu Hehua,
陈清军
,朱合华

力学学报 , 1997,
Abstract: In this paper, an efficient analysis method to calculate the response of layered halfspace subjected to arbitrary incident seismic waves is presented in algebraic matrix forms. The method is based on the substructure technique. The interaction between layered soil and halfspace is considered through the relationship between displacement and force at the interface which is solved together with the discrete equations of layered soil. The result shows that the method developed in this paper has the advantage of high accuracy and suitable for computer program.
DIGITAL UNDERGROUND SPACE AND ENGINEERING
数字地下空间与工程

ZHU Hehua,LI Xiaojun,
朱合华
,李晓军

岩石力学与工程学报 , 2007,
Abstract: After a comprehensive review on the exploitation of information technology in geotechnical engineering and underground engineering,a concept of digital underground space and engineering(DUSE) is proposed. The objectives of DUSE are strategically targeted to provide a way to obtain and organize information about underground space and engineering as follows:(1) a framework in which to publish information;(2) a set of standards about data;(2) new software and services to process useful information out of these data;and (4) new visualization tools to display all relevant information. Then,a theoretical framework of DUSE,which describes the system architecture of DUSE from the viewpoint of engineering,information,services and software system, are put forward. Thus,a taxonomy of all the data in the system is defined. Modeling of 3D space geometrical objects is divided into three categories,which are geological modeling,pipeline modeling and underground structure modeling. Accordingly,the modeling methods of each category are discussed;and spatial query tools and spatial analysis methods are examined. Some basic principles that should be followed in the process of employing visualization and virtual reality technology are also given. Finally,a case study of Shanghai Yangtze River tunnel project is provided. Research results show that DUSE is an innovative new information platform for the whole cycle life of underground space and engineering. DUSE is also a digital museum of the underground space and engineering. By employing the concept,the method and the techniques provided in DUSE,a more realistic and transparent underground space and engineering could be built;huge amount of data could be easily managed and effectively visualized. Therefore,useful information of these data can be processed,improving working efficiency and promoting the implementation of intelligent decision about the engineering project. In addition,some research topics that need to be further addressed are also discussed.
CONCEPT OF DIGITALIZATION OF UNDERGROUND ENGINEERING AND ITS PRELIMINARY APPLICATION
地下工程数字化的概念及其初步应用

LI Xiaojun,ZHU Hehua,XIE Fuqi,
李晓军
,朱合华,解福奇

岩石力学与工程学报 , 2006,
Abstract: Digitalization of underground engineering is part of the development strategy of digital earth, and it is also one of the main new developing fields in the research of underground engineering. This paper first examines the concept and research of the terms such as 3D GIS, digital stratum, 3D strata visualization, and virtual reality of underground engineering. Then the concept of digitalization of underground engineering is clearly defined, that is, based on digital stratum and the technology of informatization, digitalization of underground engineering provides an integrated and effective way for the data management of underground investigation, design, construction, monitoring etc. in the construction process, and an information sharing and analytical platform for the building, management, running, maintenance and disaster prevention of underground engineering. The objective of digitalization of underground engineering is to build a digital museum of underground engineering for all life cycle. According to the concept, a system architecture of digitalization of underground engineering is then put forward. The system architecture is comprised of five levels, which are data layer, modeling layer, representation layer, analysis layer and application layer, and functionality of each layer is also described. It is also proposed that the software development of each layer should be implemented by component technology. Finally, some preliminary application examples of digitalization of underground engineering are put forward, and some research trends in thefuture are discussed, too.
TECHNIQUE OF SYNTHETIC GEOLOGIC PREDICTION AHEAD IN TUNNEL INFORMATIONAL CONSTRUCTION
隧道信息化施工中综合超前地质预报技术

QU Haifeng,LIU Zhigang,ZHU Hehua,
曲海锋
,刘志刚,朱合华

岩石力学与工程学报 , 2006,
Abstract: Technique of geological prediction ahead is one of the important parts in tunnel informational construction,especially for important projects,it is very significant with accurate and instantaneous geological prediction.Many have been studied from different angles with new techniques and methods.Lots of methods have been acquired such as ground penetrating radar(GPR) and tunnel seismic prediction(TSP).However,engineers cannot obtain satisfied results from single prediction method.Based on this background,geological prediction techniques are discussed and studied.And then,according to ground geologic survey,GPR and TSP,a synthetic geologic prediction method is put forward.The problems such as inaccurate and even improper geological prediction,which were found during geological prediction,are discussed and the merits and weaknesses of the three main methods are analyzed.The synthetic prediction method is discussed in detail.And then the realization process is put forward.Finally,the application of the synthetic geological prediction method to the geological prediction ahead of Guangrenling tunnel is illustrated.Two faults are forecasted successfully and the precision reaches 95%.
NON-CONTACT MEASUREMENT OF ROCK MASS DISCONTINUITY OCCURRENCE WITH BINOCULAR SYSTEM
双目系统的岩体结构面产状非接触测量方法

ZHOU Chunlin,ZHU Hehua,ZHAO Wen,
周春霖
,朱合华,赵文

岩石力学与工程学报 , 2010,
Abstract: A modified pose acquiring method is advanced,which can realize non-contact measurement of rock mass discontinuities occurrence with following steps:(1) setting camera on the cloud platform,adjusting to let camera coordinate system and cloud platform coordinate system be coincidence and fixing them;(2) reducing the number of pose parameters with regular photographing procedure,and getting them from the occurrence of platform extended plane;and (3) translating 3D digital model of rock mass generated by binocular system from local coordinate system to world coordinate system and measuring the discontinuities occurrences. After the above-mentioned steps,propagation error caused by pose measuring error is analyzed. The suggested method is used to survey the rock mass discontinuities occurrences of slope and rock tunnel excavation face in field. Compared with traditional method,the proposed method is convenient to be used in field to achieve complete non-contact measurement with good precision,and the precision can be advanced easily. With this method,the measuring range of rock mass discontinuity occurrence is expanded,and the efficiency can be advanced;and the risk of survey crew exposing under rock mass can also be avoided.
EXPERIMENTAL STUDY ON ACOUSTIC WAVE PROPAGATION CHARACTER OF WATER SATURATED ROCK SAMPLES
饱水岩样声波传播规律的试验研究

ZHOU Zhiguo,ZHU Hehua,CHEN Wei,
周治国
,朱合华,陈 伟

岩石力学与工程学报 , 2006,
Abstract: 先将板岩、花岗片麻岩、黑云母片麻岩3种岩样烘干后在3个方向进行声波试验,然后将上述岩样在饱水条件下进行同样测试,通过纵横波透射测试得到岩石内部结构的一些信息,从而对3种岩样的饱水和烘干条件下声波传播规律进行研究。通过对岩石岩样声波波形、波幅衰减规律和波谱特征分析发现:(1)3种岩样吸水率均较低,平均饱和吸水率一般为0.100%~0.212%,其纵横波波速受水的影响较小。(2)3种岩样饱水后纵波的衰减速率大大降低,而横波饱的衰减速率明显增强,饱水对纵横波衰减速率的影响趋势截然相反。(3)板岩和黑云母片麻岩的声波衰减各向异性特征明显:而花岗岩片麻岩声波衰减各向异性特征不明显;3种岩样的声波衰减各向异性特征差异很大,岩样种类不同,则饱水对声波衰减速率的影响也完全不同。(4)3种岩样饱水状态下纵横波主频明显比烘干状态下要降低许多;对声波信号3层db1小波包分解后发现,3种岩样饱水后最低频率范围内纵波信号能量所占比例增加,较高频率段纵波信号能量所占比例降低。
OPTIMUM ANALYSIS OF CONSTRUCTION SCHEME OF MULTI-ARCH TUNNEL WITH EIGHT TRAFFIC LANES
双向八车道连拱隧道施工方案优化分析

XU Chongbang,XIA Caichu,ZHU Hehua,
许崇帮
,夏才初,朱合华

岩石力学与工程学报 , 2009,
Abstract: 利用有限元计算法对双向八车道连拱隧道IV,V级围岩的2种施工方法(双侧壁导坑和CRD法)进行模拟.计算和比较这2种施工方法下围岩应力和位移控制效果,结果表明,双侧壁导坑法可以更好地发挥围岩自身承载能力和初期衬砌支护作用,有利于提高二次衬砌的安全储备;CRD法对隧道两侧边墙水平位移控制比较有利,但对隧道顶部围岩沉降控制不如双侧壁导坑法有效.从总体上分析结果可知,双侧壁导坑法更适合于双向八车道连拱隧道施工.
FORWARD AND INVERSE ANALYSES OF WATER FLOW INTO TUNNELS
隧道涌水量的预测及其工程应用

Wang Jianxiu,Zhu Hehua,Ye Weimin,
王建秀
,朱合华,叶为民

岩石力学与工程学报 , 2004,
Abstract: Dynamic design and information-based construction are often adopted in deep buried tunnels in rocks abounding with in groundwater. The most important information collected in the course is the flowrate of groundwater. The flowrate from the surrounding rocks is calculated by forward and inverse methods,with practical examples. The calculation results show that the forward and inverse analyses of water flow into tunnels are essentially different from each ofter. At the pre-design stage,the flowrate can be obtained by the forward method,engineering judgement,and numerical or analytical calculations. During the dynamic design-construction stage,the flowrate can be obtained with the inverse approach based on the measured data to improve the prediction and design.
NEW ELEMENT FORM IN THE NUMERICAL SIMULATION OF BOLT-REINFORCED STRUCTURE
一种用于锚杆支护数值模拟的单元处理方法

Cai Yongchang,Zhu Hehua Li Xiaojun,
蔡永昌
,朱合华,李晓军

岩石力学与工程学报 , 2003,
Abstract: A new element form, which is based on the displacement interpolation function of triangular or quadrangular solid element and the stiffness matrix of one-dimensional truss element, is introduced into the analysis on bolt-reinforced underground structure. By using the new developed method, the bolt can be freely added or removed at the arbitrary excavation step in the finite element analysis of underground structure, and the bolt nodes need not be previously considered or arranged in the mesh generation procedure, so that the work of pre-process or mesh division procedure in finite element method can also be much reduced.
Page 1 /28209
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.