检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2023年第3期44卷 411-430页

作者： Sha XIAO zhongqi yue Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education Beijing University of TechnologyBeijing 100124China Department of Civil Engineering The University of Hong KongHong KongChina

The paper develops and examines the complete solutions for the elastic field induced by the point load vector in a general functionally graded material(FGM)model with transverse *** FGMs are approximated with n-layered *** of the n-layered materials is homogeneous and transversely *** complete solutions of the displacement and stress fields are explicitly expressed in the forms of fifteen classical Hankel transform integrals with ten kernel *** ten kernel functions are explicitly expressed in the forms of backward transfer matrices and have clear mathematical *** singular terms of the complete solutions are analytically isolated and expressed in exact closed forms in terms of elementary harmonic *** results show that the computation of the complete solutions can be achieved with high accuracy and efficiency.

关键词： functionally graded material(FGM) transverse isotropy elasticity closedform singular solution Green's function point load vector

In situ strength profiles along two adjacent vertical drillholes from digitalization of hydraulic rotary drilling

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 146-168页

作者： Xuefan Wang Peng Peng Zhigang Shan zhongqi yue Department of Civil Engineering The University of Hong KongHong KongChina PowerChina Huadong Engineering Corporation Limited HangzhouChina

Drilling speed and associated analyses from factual field data of hydraulic rotary drilling have not been fully *** paper provides the reference and comparison for the utilization of drilling information from two adjacent vertical drillholes that were formed with the same hydraulic rotary drilling machine and *** analysis of original factual data is presented to obtain the constant drilling speed during net drilling *** to the factual data along two adjacent drillholes,the digitalization results respectively include 461 linear zones and 210 linear zones with their constant drilling speeds and associated drilling *** digitalization results can accurately present the spatial distributions and interface boundaries of drilled geomaterials and the results are consistent with the paralleled site *** weighted average drilling speeds from 2.335 m/min to 0.044 m/min represent 13 types of drilled geomaterials from soils to hard *** quantitative relation between drilling speed and strength property is *** digitalization results can statistically profile the basic strength quality grades of III to VI from soils to hard *** thickness distributions of four strength quality grades are presented for each individual type of geomaterials along two *** total,50.2%of geomaterials from drillhole A are grade IV and 57.4%of geomaterials from drillhole B are grade *** digitalization results can offer an accurate and cost-effective tool to quantitatively describe the spatial distribution and in situ strength profile of drilled geomaterials in the current drilling projects.

关键词： Drilling process monitoring(DPM) Hydraulic rotary coring process Constant drilling speed Coring-resistant strength

Digital monitoring of rotary-percussive drilling with down-the-hole hammer for profiling weathered granitic ground

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1615-1636页

作者： Wendal Victor yue Siyuan Wu Manchao He Yafei Qiao zhongqi Quentin yue Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Department of Civil Engineering Faculty of EngineeringThe University of Hong KongPokfulam RoadHong KongChina State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

Rock and geotechnical engineering investigations involve drilling holes in ground with or without retrieving soil and rock samples to construct the subsurface ground *** the basis of an actual soil nailing drilling for a slope stability project in Hong Kong,this paper further develops the drilling process monitoring(DPM)method for digitally profiling the subsurface geomaterials of weathered granitic rocks using a compressed airflow driven percussive-rotary drilling machine with down-the-hole(DTH)*** transducers are installed on the drilling machine and record the chuck displacement,DTH rotational speed,and five pressures from five compressed airflows in real-time *** mechanism and operations of the drilling machine are elaborated in detail,which is essential for understanding and evaluating the drilling data.A MATLAB program is developed to automatically filter the recorded drilling data in time series and classify them into different drilling processes in sub-time *** processes include penetration,push-in with or without rod,pull-back with or without rod,rod-tightening and *** drilling data are further reconstructed to plot the curve of drill-bit depth versus the net drilling time along each of the six *** curve is found to contain multiple linear segments with a constant penetration rate,which implies a zone of homogenous geomaterial with different weathering *** effect from fluctuation of the applied pressures is evaluated *** analyses are presented for accurately assess and verify the underground profiling and strength in weathered granitic rock,which provided the basis of using DPM method to confidently assess drilling measurements to interpret the subsurface profile in real time.

关键词： Drilling process monitoring(DPM) Down-the-hole(DTH)hammer Percussive-rotary drilling Weathering granitic rocks

Rapid profiling rock mass quality underneath tunnel face for Sichuan-Xizang Railway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2024年第6期19卷 138-152页

作者： Siyuan Wu Min Qiu Zhao Yang Fuquan Ji zhongqi Quentin yue Department of Civil Engineering The University of Hong KongHong Kong 999077China CCCC Second Harbor Engineering Company Ltd. Wuhan 430000China Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure Wuhan 430000China

The Sichuan-Xizang Railway is a global challenge,surpassing other known railway projects in terms of geological and topographical *** paper presents an approach for rapidly profiling rock mass quality underneath tunnel face for the ongoing construction of the Sichuan-Xizang *** adopts the time-series method and carries out the quantitative analysis of the rock mass quality using the depth-series measurement-while-drilling(MWD)data associated with drilling of blastholes.A tunnel face with 15 blastholes is examined for *** results include identification of the boundary of homogeneous geomaterial by plotting the blasthole depth against the net drilling time,as well as quantification of rock mass quality through the recalculation of the new specific *** new specific energy profile is compared and highly consistent with laboratory test,manual logging and tunnel seismic prediction *** consistency can enhance the blasthole pattern design and facilitate the dynamic determination of charge placement and *** paper highlights the importance of digital monitoring during blasthole drilling for rapidly profiling rock mass quality underneath and ahead of tunnel *** upgrades the MWD technique for rapid profiling rock mass quality in drilling and blasting tunnels.

关键词： Measurement-while-drilling Drilling and blasting Rock mass quality New specific energy Constant penetration rate Sichuan-Xizang railway Tunnelling

Extended wet sieving method for determination of complete particle size distribution of general soils

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 242-257页

作者： Shengnan Ma Yi Song Jiawei Liu Xingyu Kang zhongqi Quentin yue Department of Civil Engineering The University of Hong KongHong KongChina

The traditional standard wet sieving method uses steel sieves with aperture?0.063 mm and can only determine the particle size distribution(PSD)of gravel and sand in general *** paper extends the traditional method and presents an extended wet sieving *** extended method uses both the steel sieves and the nylon filter cloth *** apertures of the cloth sieves are smaller than 0.063 mm and equal 0.048 mm,0.038 mm,0.014 mm,0.012 mm,0.0063 mm,0.004 mm,0.003 mm,0.002 mm,and 0.001 mm,*** extended method uses five steps to separate the general soil into many material sub-groups of gravel,sand,silt and clay with known particle size *** complete PSD of the general soil is then calculated from the dry masses of the individual material *** extended method is demonstrated with a general soil of completely decomposed granite(CDG)in Hong Kong,*** silt and clay materials with different particle size ranges are further examined,checked and verified using stereomicroscopic observation,physical and chemical property *** results further confirm the correctness of the extended wet sieving method.

关键词： Particle size distribution(PSD) General soil Silt Clay Wet sieving Physical and chemical properties

Tidal flat erosion of the Huanghe River Delta due to local changes in hydrodynamic conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第7期33卷 116-124页

作者： JIA Yonggang ZHENG Jiewen yue zhongqi LIU Xiaolei SHAN Hongxian Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China First Institute of Oceanology State Oceanic Administration Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology First Institute of Oceanography State Oceanic Administration Department of Civil Engineering University of Hong Kong

An ideal nature system for the study of post-depositional submarine mass changing under wave loading was selected in the intertidal platform of the subaqueous Huanghe River Delta, a delta formed during period from 1964 to 1976 as the Huanghe River discharged into the Bohai Gulf by Diaokou distributary. A road embankment constructed for petroleum recovery on the inter-tidal platform in 1995 induced the essential varieties of hydrodynamic conditions on the both sides of the road. With both sides sharing similarities in （1） initial sedimentary environment, （2） energetic wave loading, （3） differential hydrodynamic conditions in later stages, （4） enough long-range action, and （5） extreme shallow water inter-tidal platforms; the study is representative and feasible as well. Two study sites were selected on each side of the road, and a series of measurements, samplings, laboratory experiments have been carried out, including morphometry, hydrodynamic conditions, sediment properties, granularity composition, and fractal dimension calculation of the topography in the two adjacent areas. It was observed that in the outer zone, where wave loading with high magnitude prevailed, the tidal flat was bumpy and exhibited a high erosion rate and high fractal dimension. Further, the fractal dimension diminished quickly, keeping with the enlarging of calculative square size. However in the inner zone, where the hydrodynamic condition was weak, the tidal fiat was fiat and exhibited a low erosion rate and low fractal dimensions; the fractal dimension diminished with the enlarging of calcu- lative square size. The fractal dimensions in the different hydrodynamic areas equalized increasingly as the calculative square size accreted to threshold, indicating that the hydrodynamic condition plays a significant role in topography construction and submarine delta erosion process. Additionally, the later differentiation of sediment properties, granularity composition, microstructure characteristi

关键词： hydrodynamic conditions coastal erosion sea-bed topography in-situ measurement fractal calculation

Application and reliability analysis of DPM system in site investigation of HK weathered granite

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2005年第6期12卷 481-488页

作者： Zhuoying Tan Meifeng Cai zhongqi yue L.G. Tham C.F. Lee State Key Laboratory of High-Efficient Mining and Safety of Metal Mines （University of Science and Technology Beijing） Ministry of Education Beijing 100083 China Department of Civil Engineering University of Hong Kong Pokfulam Road Hong Kong China

A drilling process monitor （DPM） for ground characterization of weathered granite is presented. The monitor is portable and can be mounted on a hydraulic rotary drilling rig to record various drilling parameters in real time during normal subsurface investigation. The identification method for dominative and subsidiary interfaces has been established. The study reveals that the monitored drilling parameters are dependent on geotechnical materials and can be further applied to characterize ground interfaces. The t-test between manual logging and DPM logging has been carried out. The results show that the DPM has high accuracy in interfaces detection and well agreement with the manual logging. The findings show that the device and data analysis method are of potential application in subsurface drilling exploration in weathered granites. It also seems to have prospective uses in the determination of orebody boundary as well as in the detection of geohazards.

关键词： drilling process monitoring hydraulic rotary drill instrumented borehole drilling geotechnical engineering weathered granite

基于数字图像的真实细观非均质岩土力学分析数值方法

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2022年第1期65卷 108-118页

作者：岳中琦香港大学土木工程系中国香港

本文介绍基于真实非均质岩土材料的数值方法与研究进展.这些方法运用新发展的数字图像技术,获取真实岩土和混凝土材料的细观非均质分布,再进行定量细观结构研究,采用数值计算程序,定量分析它们的物理力学响应,为解决限制岩土和混凝土力... 详细信息

本文介绍基于真实非均质岩土材料的数值方法与研究进展.这些方法运用新发展的数字图像技术,获取真实岩土和混凝土材料的细观非均质分布,再进行定量细观结构研究,采用数值计算程序,定量分析它们的物理力学响应,为解决限制岩土和混凝土力学进一步发展的非均质材料假设问题提供了有效途径.本文介绍该方法的研究背景和三项主要内容.包括真实细观非均质岩土材料力学数值分析方法,非均质岩土材料数值网格计算方法,和非均质岩土材料力学响应重要规律.

关键词：数字图像处理岩土力学地质力学数值方法非均质岩土材料混凝土

岩土细观介质空间分布数字表述和相关力学数值分析的方法、应用和进展

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

岩石力学与工程学报 2006年第5期25卷 875-888页

作者：岳中琦香港大学土木工程系

介绍和总结近十多年来研究实际岩土细观介质空间分布的方法,以及基于实际细观介质空间分布数学表述而建立的力学数值计算网格自动生成的方法和应用,该项研究可为解决岩土力学主流方法常遇到的岩土模型与参数给不准和本构关系模型种类繁... 详细信息

介绍和总结近十多年来研究实际岩土细观介质空间分布的方法,以及基于实际细观介质空间分布数学表述而建立的力学数值计算网格自动生成的方法和应用,该项研究可为解决岩土力学主流方法常遇到的岩土模型与参数给不准和本构关系模型种类繁多这两个重要问题提供可行途径。该可行途径主要包括采用数字图像技术来对岩土材料内部细观不同介质的空间分布进行精确测量和数值表述以及采用相应的数值计算方法。研究结果表明,数字图像技术可以用来准确量测和表述岩土内部各种介质的实际空间分布,这些空间分布数据可以用来建立岩土内部不同细观介质的空间分布和相应数值计算网格,并通过与现有的数值计算方法如有限元法或有限差分法相结合来实现考虑真实岩土材料不同种细观介质及其空间分布的力学数值分析和预测。进一步探讨如何应用该方法来建立微观–细观–宏观不同尺度耦合的真实岩土力学分析和预测方法与理论。SCI论文检索结果表明,所提出的方法和途径是岩土力学相关研究和探索的最新进展。

关键词：数值分析岩土力学细观数字图像网格自动生成有限元法有限差分法

Waterproof of rock joint with lead strip for splitting tuff sheet in ancient China quarrying caverns

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第4期55卷 960-969页

作者： YANG ZhiFa ZHANG LuQing yue zhongqi ZHANG ZhongJian YANG TianYao LIN XianJian TAO KeJie ZHU JieWang Key Laboratory of Engineering Geomechanics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Department of Civil Engineering University ofHong Kong Hong Kong China Shepandao Hotspring Resort Co. Ltd. Sanmen 317100 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Civil Engineering Institute Shandong Construction University Jinan 250001 China

This paper presents the relics of rock joints caulked with lead strips, unearthed by the authors in 2007 and 2008. The relics were in ancient quarry caverns in Shepan Island, Zhejiang Province, eastern China. The quarry activities were mainly carried out for production of regular tuff stone plates about 800 years ago. Each of the lead strips was sealed into a rock joint by punching manually and carefully. At present, the lead strips still contact tightly with the rock joints and new mineral cerussite is found to have formed at the contact surfaces between the lead strip and its caulked rock joint. The use of lead strips caulking rock joints in quarry caverns is found for prevention of water from seeping out of the country rocks into quarry cavern bases, where all of the in-situ intact tuff rock was manually and near-horizontally split into thin rock sheets one by one for production of regular tuff plates. Furthermore, it is found that the tensile splitting of tuff sheets at the cavern base required the intact rocks at the cavern base had to be dry. Through this horizontal base splitting for tuff sheets from the top to the bottom, a dome-shape interior space was formed for each rock cavern with the near horizontal imprints of thin sheet layers permanently on the sidewalls.

关键词： rock cavern lead strips sealant joints waterproof tuff splitting quarry