Longitudinal vibration characteristics of a tapered pipe pile considering the vertical support of surrounding soil and construction disturbance

This research is concentrated on the longitudinal vibration of a tapered pipe pile considering the vertical support of the surrounding soil and construction disturbance.First,the pile-soil system is partitioned into finite segments in the vertical direction and the Voigt model is applied to simulate the vertical support of the surrounding soil acting on the pile segment.The surrounding soil is divided into finite ring-shaped zones in the radial direction to consider the construction disturbance.Then,the shear complex stiffness at the pile-soil interface is derived by solving the dynamic equilibrium equation for the soil from the outermost to innermost zone.The displacement impedance at the top of an arbitrary pile segment is obtained by solving the dynamic equilibrium equation for the pile and is combined with the vertical support of the surrounding soil to derive the displacement impedance at the bottom of the upper adjacent segment.Further,the displacement impedance at the pile head is obtained based on the impedance function transfer technique.Finally,the reliability of the proposed solution is verified,followed by a sensitivity analysis concerning the coupling effect of the pile parameters,construction disturbance and the vertical support of the surrounding soil on the displacement impedance of the pile.

Discussion on Construction Technology of Subway Tunnel Expansion under Bridge Foundation

As the urban populations grow,the number and size of subway construction projects are increasing while also meeting higher construction standards.So,subway construction projects must have a better understanding of construction technology.This article focuses on the construction technology of the subway tunnel expansion under the bridge foundation.By analyzing the engineering characteristics of the bridge foundation and using a project as an example,this article provides a detailed discussion of the construction process of tunnel expansion under a bridge foundation.This article aims to serve as a reference for subway tunnel construction in China to ensure the key points of construction technology are understood,thus improving construction quality and laying a solid technical foundation for the sustainable development of urban rail engineering.

Construction Technology of Deep Foundation Pit Support in Municipal Civil Engineering Foundation Construction

Municipal civil engineering is the key content of municipal construction,and the construction scale is usually large.The quality of the project plays an important role in the development of urban economy.Due to the rapid increase of high-rise buildings,skyscrapers and underground buildings,the construction technology of deep foundation pit support has gradually become an indispensable construction technology.Therefore,the selection of foundation pit support construction technology is crucial in ensuring that whether the foundation is firm and stable,and whether the subsequent construction activities can be carried out smoothly.In view of this,the article discusses the application of deep foundation pit support construction technology in municipal civil engineering,aiming to provide reference for subsequent projects.

Comparison of School Building Construction Costs Estimation Methods Using Regression Analysis, Neural Network, and Support Vector Machine

Accurate cost estimation at the early stage of a construction project is key factor in a project’s success. But it is difficult to quickly and accurately estimate construction costs at the planning stage, when drawings, documentation and the like are still incomplete. As such, various techniques have been applied to accurately estimate construction costs at an early stage, when project information is limited. While the various techniques have their pros and cons, there has been little effort made to determine the best technique in terms of cost estimating performance. The objective of this research is to compare the accuracy of three estimating techniques (regression analysis (RA), neural network (NN), and support vector machine techniques (SVM)) by performing estimations of construction costs. By comparing the accuracy of these techniques using historical cost data, it was found that NN model showed more accurate estimation results than the RA and SVM models. Consequently, it is determined that NN model is most suitable for estimating the cost of school building projects.

Application Strategies of Shotcrete Anchor Support Technology in Highway Bridge and Tunnel Engineering

This article analyzes the application strategies of shotcrete anchor support technology using a highway bridge-tunnel construction project as an example.The article covers various strategies,including support plan formulation,mortar shotcrete anchor construction,grid steel frame construction,steel mesh construction,and concrete support construction.This analysis aims to provide a guideline for those interested in applying this technology and improving the quality and safety of highway bridges and tunnels construction.

An Examination on the Support of Library Information to the Construction of National Research Organizations

The country’s economic development determines the political and cultural status.At the present time,China’s rapid economic development has greatly improved the country’s international prominence.Although China has high economic and political achievements,China’s cultural soft power is still in a weak position.Cultural soft power is of great significance in improving the country’s overall national strength and international competitiveness.Research organizations are an important part of the country’s soft power and are of great significance to the strengthening of national soft power.Research organizations are the“peripheral brain”in the decision-making process of the government.National government agencies need democratic science in making decisions,and the adopted policy methods must have positive and effective outcomes on the people.Therefore,the national government agencies cannot achieve this without the help of research organizations.This resulted in the development and rising construction of research organizations.With the comprehensive development and construction of research organizations,whilst making progress,has also exposed several shortcomings.The construction of China’s research organizations requires various supports;especially the intelligence agencies and access to library information,which has a unique advantage in promoting the construction of research organizations[1].This paper first introduces the definition,classification and characteristics of a research organization.It will also provide a preliminary understanding of research organizations.The paper will then highlight and analyze the problems encountered by the research organization.Finally,through the grasp of the advantages of the library and intelligence agencies,a solution is proposed.

Research on Financial Support of New Countryside Construction in China

The cpc＇s 13th Five-Year comprehensive plan put forward a major historic task of building a new socialist countryside. This is the comprehensive implementation of urban and rural development to increase industrial agriculture, move the city to support the countryside, accelerate urbanization and narrow the gap between urban and rural areas. To solve the ＂three rural issues＂, the comprehensive construction ofa well-offsociety, has a very important strategic role to ease the contradiction of China＇s rural and urban ecnomic structure. In the process of building a new socialist countryside, the financial policy, as an important means ofmacroeconomic regulation and control, should play a leading role in solving the effective allocation ＆funds. Due to various factors affected by the current supply of rural financial market constraints, system defects and environmental constraints, there is a large gap between the level of the existing rural financial services and the requirements of the new rural construction which is to be improved urgently.

The Effection Analysis of Geotechnical Investigation on Foundation Pit Supporting Construction

With the continuous development of the construction industry,the density of engineering construction and the difficulty of underground construction are also increasing.As an important construction protection measure,foundation pit support construction is widely used in underground construction.Starting from the characteristics of foundation pit support construction,this paper analyzes the influence of geotechnical investigation on foundation pit support construction,and analyzes the problems that need to be paid attention to in the survey process.

Analysis on Discipline Construction and Development Strategy of National-level Professional Research Institutes

Discipline construction is development core of a professional research institute. The paper describes function,guiding ideology,and construction of discipline construction,based on giving a national-level professional research institute directly under the Ministry of Science and Technology,as an example. Furthermore,according to current situation of discipline construction in a professional research institute,the paper discusses development ideas of discipline construction. The final goal of the paper is to provide basis and reference for reinforcing discipline construction of professional research institutes.

Optimization of anchorage support parameters for soft rock tunnel based on displacement control theory

In the construction of a soft rock tunnel,it is critical to accurately estimate the pre-stressed anchor support parameters for surrounding rock reinforcement;otherwise,engineering disasters may occur.This paper presents a support parameter selection method that aims to allow deformation as a control objective,which was applied to the tunnel located in Muzailing Highway,Min County,Dingxi City,Gansu Province,China.Through theoretical analysis,we have identified five factors that influence pre-stressing anchorages.The selection of mechanical parameters for the rock mass was carried out using an inverse analysis method.Compared with the measured data,the maximum displacement error of the numerical simulation results was only 0.07 m.The length of anchor cable,circumferential spacing of anchor cable,longitudinal spacing,and pre-stress index are adopted as the input parameters for the support vector machine neural network model based on particle swarm optimization(PSO-LSSVM).Besides,the vault subsidence and the maximum deformation of surrounding rock are considered as output values(performance indices).The goodness of fit between the predicted values and the simulated values exceeds 0.9.Finally,all support parameters within the acceptable deformation range are calculated.The optimal support variables are derived by considering the construction cost and duration.The field application results show that it is feasible to construct the sample database utilizing the numerical simulation approach by taking the displacement as the control target and using the neural network to specify the appropriate support parameters.

Application of GIS in New Socialist Countryside Construction

Survey and research of new socialist countryside construction in Hebei Province are favorable for determining approaches and construction mode of new socialist countryside in other areas,and favorable for advancing the urban and rural integration in Hebei Province. With the aid of GIS technology,it is able to create spatial information database,correlate with rural statistical data and spatial information. Then,in the form of thematic map,it can visually indicate current situations of rural economy,and existing problems of development. Finally,it is expected to promote rural information construction and guide new countryside planning,to facilitate inquiry and search of information,and to provide supporting decisions for new socialist countryside construction.

Development of an Effective System for Selecting Construction Materials for Sustainable Residential Housing in Western Australia

Urbanization and living comfort have revolutionized the construction industry. Many techniques and strategies have been used to improve the overall efficiency of construction and to reduce waste during and after the construction activity;some are cost effective and some not. Sustainable construction strategies have addressed these issues by proposing relatively more cost effective and environment-saving solutions. One strategy is to select sustainable construction materials at the building design stage. This article involved a questionnaire survey to collect data about local technical stakeholders’ (architects, designers, engineers, estimators, and managers) awareness of environmental sustainability and current practices for selecting construction materials. A sustainability index (SI) was developed using SPSS (Statistical Package for the Social Sciences) for the complex statistical analysis. These data were used to develop a decision support system (DSS) using the multi-criteria decision making (MCDM) technique, the TOPSIS. The support system was validated by applying it to sustainable roof products in a pilot case study—these materials are frequently used in local markets for residential construction in West Australia. So the main objective was to get insight to local market trends and features involved in construction materials selection. Data analysis was carried out to develop a decision support system to help technical stakeholders in construction materials selection process.

Design and construction of high and large span cast-in-place reinforced concrete cantilever flowering frame beam

The high and large span cast-in-place reinforced concrete cantilever structure of the office building of some court, which is located I-steel at the cantilever and used steel pipe scaffold as the support, has guaranteed the frame body and structure security by the frame body calculating, on-site test and reasonable construction order.

Practice and Exploration of New Rural Construction in West Bank of Taiwan Strait Led by Spark Science and Technology

According to practice and exploration of spark program for 26 years in Quanzhou,the main model and their effects of new rural construction in west bank of Taiwan Strait led by spark science and technology were expounded. Six spark program systems were established,consisting of policy support guide,science and technology project lead,experts' intelligence support,spark science and technology training,scitech information service and spark program demonstration. Five spark projects were implemented to promote new rural construction in the west bank of Taiwan Strait,such as constructing the national spark industrial zone,organizing the new rural construction led by science and technology,constituting spark sci-tech innovation center,developing the rural informatization,and establishing science and technology commissioner bases. Finally,enlightenment of spark program and its development ways in the future were put forward.

土壤废弃农膜综合治理考核体系建设与实践——以新疆生产建设兵团为例

为科学治理土壤废弃农膜,检验废弃农膜综合治理成效,构建了一套完备的新疆生产建设兵团(以下简称兵团)土壤废弃农膜治理考核体系,制定了各师年度考核目标任务,提出了土壤废弃农膜考核抽测全流程方法,形成了包括组织结构、财政补贴、回收利用、督促检查、受理举报、执法及宣传在内的考核评价指南,建立了包含基础支撑层、数据层、应用层和用户层4个方面的全流程信息化管理系统。实践结果表明:兵团土壤废弃农膜残留量明显降低,综合治理体系逐步完善,产业化发展模式基本形成。探索形成的该套覆盖废弃农膜综合治理考核全过程的技术体系和组织实施模式,可为其他地区废弃农膜综合治理成效评估提供参考和借鉴。

新型电力系统主动构网机理与技术路径

随着新一代“双高”电力系统的发展,新能源并网变换系统逐渐由随网型向构网型演变,当新能源机组集群运行时,并网情况将更加复杂。变换器的构网能力需亟待研究,同时也是电力能源转型需承担的重要使命。该文立足并网系统内外形态的全局性和传统并网变换系统性能分析的局限性,对并网变换器的主动构网支撑机理进行再揭示。首先,对虚拟同步技术与构网机理进行简要评述;其次,就集群并网系统的建模问题、多机集群并网运行时的耦合交互问题、支撑构网能力的储能配置和运行边界等3个关键技术问题,进行深入研究;最后,针对上述3个关键技术问题,进行技术路径探索和研判。该文的思路为形成适用于未来新能源集群并网运行的系统化理论和实用化方法奠定一定基础。

内生型农村互助养老的运行机制及其社会基础——以浙江罗村为例

外生型农村互助养老模式在地方实践中面临可持续发展困境,因此,如何激活村庄互助养老内生动力具有重要意义。通过对浙江省中部罗村的田野调查,分析内生型互助养老运行机制的构建路径,阐明引导和约束运行机制的社会基础。研究发现,新乡贤、村集体及(新)村民等多元主体构建起组织建设、资金筹措、文化浸润以及行为激励四重运行机制。依托乡村精英的工具理性与价值理性、熟人社会的相互信任与面子竞争、地方知识的关联建构与拓展应用等乡村社会基础促进内生型互助养老实践生成,以软性约束方式保障实践长效运行。基于此,加强乡村社会建设、通过农民自组织互助养老应是建设内生型互助养老模式的核心要义。

Construction of human Fab library and screening of a single-domain antibody of amyloid-beta 42 oligomers

Screening humanized antibodies from a human Fab phage display library is an effective and quick method to obtain beta-amyloid oligomers. Thus, the present study prepared amyloid-beta 42 oli- gomers and constructed a have human Fab phage display library based on blood samples from six healthy people. After three rounds of biopanning in vitro, a human single-domain antibody that spe- cifically recognized amyloid-beta 42 oligomers was identified. Western blot and enzyme-linked im- munosorbent assay demonstrated this antibody bound specifically to human amyloid-beta 42 tetramer and nonamer, but not the monomer or high molecular weight oligomers. This study suc- cessfully constructed a human phage display library and screened a single-domain antibody that specifically recognized amyloid-beta 42 oligomers.

数据驱动儿童专科医院大型医疗设备运行评价体系建设

目的探索通过数据采集及分析评价儿童专科医院大型医疗设备运行水平的方法,提出大型医疗设备使用及配置建议。方法通过物联网终端采集设备运行数据,结合医院HIS、RIS、HRP等系统数据,建立儿童专科医院大型医疗设备评价指标体系,运用CRITIC法对单类、单台设备数据进行量化评价。结果医院大数据平台实现了对单台大型设备运行数据纵向分析并形成可视化图表,通过PC端及移动端展示。申康市级平台数据分析,实现对儿童专科医院大型设备运行水平的综合量化评价及使用配置建议。结论通过数据采集及分析,实现儿童专科医院大型设备运行评价体系建设,提升大型设备管理水平。

深部破碎软岩巷道超前控顶加固及控制爆破技术

随着矿山开采深度逐渐增加,深部破碎围岩工程地质条件转为复杂多变,极大程度上影响巷道等工程施工过程及后续使用安全;为确保深部破碎软岩巷道施工过程中安全及质量,提出了软岩巷道超前控顶加固及控制爆破技术。针对钟九铁矿-550 m水平6号交岔点岩体裂隙极为发育、稳定性差等特点,拟采用超前控顶措施加固顶板围岩,提高深部破碎软岩巷道的承载力。为便于6号交岔点掘进施工,沿6号交岔点东北侧方向划分17个掘进区,并采用“四步”台阶法分段施工。针对同段起爆数码电子雷管,起爆器系统可随机设置单发雷管起爆间隔时间为3~5 ms,实现同段炮孔单孔单响,降低爆破振动对6号交岔点影响。根据不同掘进区总体岩性情况,优化支护方式(管棚支护、W型钢带及锚索支护等联合支护方式等),确保6号交岔点后续使用期安全。试验结果表明:采用超前控顶加固、控制分区爆破技术,降低破碎软岩巷道顶板偏帮、下沉,保证6号交岔点断面成型效果,削减其支护、后期维护等综合成本达8.7%,该技术可为类似巷道施工提供一定指导建议。