检索结果-南通市图书馆

Recycled materials in railroad substructure: an energy perspective

Railway Engineering Science 2022年第3期30卷 304-322页

作者： buddhima indraratna Yujie Qi Rakesh Sai Malisetty Sinniah KNavaratnarajah Fatima Mehmood Miriam Tawk Transport Research Centre School of Civil and Environmental EngineeringFaculty of Engineering and Information TechnologyUniversity of Technology SydneySydneyNSW 2007Australia Department of Civil Engineering Faculty of EngineeringUniversity of PeradeniyaPeradeniyaSri Lanka School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongongNSW 2522Australia College of Engineering and Technology American University of the Middle EastEgailaKuwait

Given that the current ballasted tracks in Australia may not be able to support faster and significantly heavier freight trains as planned for the future,the imminent need for innovative and sustainable ballasted tracks for transport infrastructure is *** the past two decades,a number of studies have been conducted by the researchers of Transport Research Centre(TRC)at the University of Technology Sydney(UTS)to investigate the ability of recycled rubber mats,as well as waste tyre cells and granulated rubber to improve the stability of track substructure including ballast and subballast *** paper reviews four applications of these novel methods,including using recycled rubber products such as CWRC mixtures(i.e.,mixtures of coal wash(CW)and rubber crumbs(RC))and SEAL mixtures(i.e.,mixtures of steel furnace slag,CW and RC)to replace subballast/capping materials,tyre cells reinforcements for subballast/capping layer and under ballast mats;and investigates the energy dissipation capacity for each application based on smallscale cyclic triaxial tests and large-scale track model *** has been found that the inclusion of these rubber products increases the energy dissipation effect of the track,hence reducing the ballast degradation efficiently and increasing the track ***,a rheological model is also proposed to investigate the effect of different rubber inclusions on their efficiency to reduce the transient motion of rail track under dynamic *** outcomes elucidated in this paper will lead to a better understanding of the performance of ballast tracks upgraded with resilient rubber products,while promoting environmentally sustainable and more affordable ballasted tracks for greater passenger comfort and increased safety.

关键词： Ballast degradation Recycled rubber Energy dissipation Laboratory testing Rheological model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review of shear strength models for rock joints subjected to constant normal stiffness

引用

Journal of Rock Mechanics and Geotechnical Engineering 2016年第3期8卷 405-414页

作者： Sivanathan Thirukumaran buddhima indraratna Research Centre for Geomechanics and Railway Engineering Faculty of Engineering and Information Sciences University of Wollongong WollongongNSW 2522 Australia Aurecon Australasisa Pty Ltd. Level 2 116 Military Road Neutral Bay NSW 2089 Australia

The typical shear behaviour of rough joints has been studied under constant normal load/stress （CNL） boundary conditions, but recent studies have shown that this boundary condition may not replicate true practical situations. Constant normal stiffness （CNS） is more appropriate to describe the stress-strain response of field joints since the CNS boundary condition is more realistic than CNL. The practical implications of CNS are movements of unstable blocks in the roof or walls of an underground excavation, reinforced rock wedges sliding in a rock slope or foundation, and the vertical movement of rock-socketed concrete piles. In this paper, the highlights and limitations of the existing models used to predict the shear strength/behaviour of joints under CNS conditions are discussed in depth.

关键词： Rock jointsShear strengthDilationAsperity damageConstant normal stiffness (CNS)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An approach to measure infill matric suction of irregular infilled rock joints under constant normal stiffness shearing

引用

Journal of Rock Mechanics and Geotechnical Engineering 2018年第4期10卷 653-660页

作者： Libin Gong Ana Heitor buddhima indraratna School of Civil Mining and Environmental Engineering University of Wollongong

Rock joints infilled with sediments can strongly influence the strength of rock mass. As infilled joints often exist under unsaturated condition, this study investigated the influence of matric suction of infill on the overall joint shear strength. A novel technique that allows direct measurement of matric suction of infill using high capacity tensiometers(HCTs) during direct shear of infilled joints under constant normal stiffness(CNS) is described. The CNS apparatus was modified to accommodate the HCT and the procedure is explained in detail. Joint specimens were simulated by gypsum plaster using threedimensional(3D) printed surface moulds, and filled with kaolin and sand mixture prepared at different water contents. Shear behaviours of both planar infilled joints and rough joints having joint roughness coefficients(JRCs) of 8-10 and 18-20 with the ratios of infill thickness to asperity height(t/a)equal to 0.5 were investigated. Matric suction shows predominantly unimodal behaviour during shearing of both planar and rough joints, which is closely associated with the variation of unloading rate and volumetric changes of the infill material. As expected, two-peak behaviour was observed for the rough joints and both peaks increased with the increase of infill matric suction. The results suggest that the contribution of matric suction of infill on the joint peak normalised shear stress is relatively independent of the joint roughness.

关键词： Infilled rock joints Matric suction High capacity tensiometer (HCT) Three-dimensional (3D) printing Normalised shear stress Unloading rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance of marine clay stabilised with vacuum pressure: Based on Queensland experience

引用

Journal of Rock Mechanics and Geotechnical Engineering 2019年第3期11卷 598-611页

作者： buddhima indraratna Cholachat Rujikiatkamjorn Pankaj Baral Jayantha Ameratunga Industrial Transformation Training Centre(ITTC)for Advanced Technologies in Rail Track Infrastructure&Centre for Geomechanics and Railway Engineering(CGRE) School of CivilMining and Environmental EngineeringUniversity of WollongongWollongong CityNSW 2522Australia School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongong CityNSW 2522Australia Centre for Geomechanics and Railway Engineering University of WollongongWollongong CityNSW 2522Australia Golder Associates Pty Ltd. MiltonQueensland 4064Australia

Stabilising soft marine clay and estuarine soils via vacuum preloading has become very popular in Australasia over the past decades because it is a cost-effective and time-efficient *** recent times,new land on areas outside but adjacent to existing port amenities,the Fisherman Islands at the Port of Brisbane(POB),was reclaimed to cater for an increase in trade activities.A vacuum preloading method combined with surcharge to stabilise the deep layers of soil was used to enhance the application of prefabricated vertical drains(PVDs).This paper describes the performance of this combined surcharge fill and vacuum system under the embankment and also compares it with a surcharge loading system to demonstrate the benefits of vacuum pressure over conventional *** performance of this embankment is also presented in terms of field monitoring data,and the relative performance of the vacuum together with non-vacuum systems is *** analytical solution to radial consolidation with time-dependent surcharge loading and vacuum pressure is also presented in order to predict the settlement and associated excess pore water pressure(EPWP)of deposits of thick soft clay.

关键词： Soft clay Prefabricated vertical drains(PVDs) Vacuum consolidation Membrane-less system Membrane system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The mechanism and effects of subgrade fluidisation under ballasted railway tracks

引用

Railway Engineering Science 2020年第2期28卷 113-128页

作者： buddhima indraratna Mandeep Singh Thanh Trung Nguyen Centre for Geomechanics and Railway Engineering University of WollongongWollongong CityNSW 2522Australia Australian Research Council(ARC)Industrial Transformation Training Centre ITTC-RailUniversity of WollongongWollongong CityNSW 2522Australia

The rapid growth in railway infrastructure and the construction of high-speed heavy-haul rail network,especially on ground that is basically unsuitable,poses challenges for geotechnical engineers because a large part of the money invested in the development of railway lines is often spent on track *** fact around the world,the mud pumping of subgrade fines is one of the common reasons why track performance deteriorates and track stability is *** article presents a series of laboratory tests to examine following aspects of mud pumping:(1)the mechanisms of subgrade fluidisation under undrained condition,(2)the effects of mud pumping on the engineering characteristics of ballast,and(3)the use of vertical drains to stabilize subgrade under cyclic *** undrained cyclic triaxial testing on vulnerable soft subgrade was performed by varying the cyclic stress ratio(CSR)from 0.2 to 1.0 and the loading frequency f from 1.0 to 5.0 *** is seen from the test results that for a specimen compacted at an initial dry density of 1790 kg/m3,the top portion of the specimen fluidises at CSR=0.5,irrespective of the applied loading *** cyclic railway loading,the internal redistribution of water at the top of the subgrade layer softens the soil and also reduces its *** response to these problems,this paper explains how the inclusion of vertical drains in soft subgrade will help to prevent mud pumping by alleviating the build-up of excess pore pressures under moving train loads.

关键词： Mud pumping Ballasted track Subgrade fluidisation Fouled ballast Prefabricated vertical drains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radial consolidation characteristics of soft undisturbed clay based on large specimens

引用

Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1037-1045页

作者： Pankaj Baral Cholachat Rujikiatkamjorn buddhima indraratna Richard Kelly Research Centre for Geomechanics and Railway Engineering Faculty of Engineering and Information SciencesUniversity of WollongongWollongongNSW2522Australia SMEC-Australia and New Zealand Division BrisbaneQueenslandAustralia

In recent years, reconstituted small samples have often been used to assess the performance of radial consolidation due to prefabricated vertical drains(PVDs), but the permeability and compressibility of samples of undisturbed soil often differ from those of the remoulded ones. The problem seems more complex in marine environment due to the presence of random coarse particles including gravels, shells and natural partings. Performing small-scale laboratory experiment with reconstituted samples, especially in marine environment, cannot predict the exact soil behaviour in the field. This paper describes an experimental programme that measures radial consolidation using a conventional Rowe cell and a largescale consolidometer, where the samples of undisturbed soil obtained from a site along the Pacific Highway(north of Sydney) were compared using measured settlements and excess pore ***, this paper highlights the implications of the smear effect and sample size influence, which are imperative in translating the laboratory testing practices to actual real-life behaviour. The effect of vacuum pressure on the coefficient of radial consolidation of a large-scale undisturbed test specimen is also discussed. The paper demonstrates that the extent of smear zone in the field can be very similar to the large-scale laboratory consolidation test using a scaled-down drain and mandrel, but considerably different from the data obtained for small laboratory specimens.

关键词： Consolidation Soft soil Vertical drain Undisturbed clay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

循环荷载水平与加载频率耦合作用下的软粘土特性研究

引用

工程力学 2014年第10期31卷 167-173页

作者：倪静 buddhima indraratna 耿雪玉陈有亮朱颖上海理工大学土木工程系上海200093 澳大利亚卧龙岗大学土木工程系

通过不排水循环三轴试验,并考虑不同循环应力水平及加载频率的影响,研究了软粘土在循环荷载作用下的孔隙水压力及变形特性,分别探讨了这些特性随循环加载时间和加载次数的不同变化规律。研究结果表明,对于相同循环应力水平,相同加载次... 详细信息

通过不排水循环三轴试验,并考虑不同循环应力水平及加载频率的影响,研究了软粘土在循环荷载作用下的孔隙水压力及变形特性,分别探讨了这些特性随循环加载时间和加载次数的不同变化规律。研究结果表明,对于相同循环应力水平,相同加载次数下不同加载频率的软粘土特性有所不同,而相同加载时间下不同加载频率的软粘土特性基本相同。此外,无论加载频率为何数值,一旦循环应力水平超过临界值,软粘土破坏必将发生。为了深入研究应力水平和加载频率的耦合作用,该文从应力控制循环加载试验中的应变速率着手,对软粘土的特性进行了分析。结果表明,在应力水平相同的情况下,软粘土在不同加载频率下的应变速率是基本相同的,由此可得对于软粘土在循环荷载作用下特性的影响,应力水平比加载频率更为重要。

关键词：软粘土循环荷载孔隙水压力应变加载速率

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Performance of alkaline reactive materials in the remediation of acidic groundwater

引用

Chinese Journal Of Geochemistry 2006年第B8期25卷 88-89页

作者： Alexandra N. Golab buddhima indraratna Mark A. Peterson School of Civil Mining and Environmental Engineering University of Wollongong Wollongong Australia

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

粘结式岩石锚杆设计中的解析模型

引用

公路隧道 2002年第1期 19-31页

作者： B．indraratna P．K．Kaiser 刘洪洲熊有言

本文推出了一个解析模型，用来表征静水应力场中圆形地下洞室附近被加固围岩的特性。该模型采用了弹塑性理论，并考虑了地层和粘结式(或摩擦式)锚杆间适当的相互作用机理。它着重探讨了锚杆布置型式对塑性区范围和隧道变形的影响，并引... 详细信息

本文推出了一个解析模型，用来表征静水应力场中圆形地下洞室附近被加固围岩的特性。该模型采用了弹塑性理论，并考虑了地层和粘结式(或摩擦式)锚杆间适当的相互作用机理。它着重探讨了锚杆布置型式对塑性区范围和隧道变形的影响，并引入一个无量纲参数来作为设计工具，它将隧道收敛和给定锚杆长度的锚杆间距联系起来。本文介绍该模型的推求过程，并解释锚杆对洞室周围应力场和位移场的影响．扼要探讨了该模型在隧道设计中的应用。在随后的论文中将详细给出用实验室模拟和现场测试结果检验该模型的情况。

关键词：粘结式岩石锚杆解析模型应力场地下洞室弹塑性隧道设计收敛控制法等效塑性区

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：