检索结果-南通市图书馆

Combination of effective color information and machine learning for rapid prediction of soil water content

Journal of rock Mechanics and Geotechnical engineering 2023年第9期15卷 2441-2457页

作者： Guanshi Liu Shengkui Tian Guofang Xu Chengcheng Zhang Mingxuan Cai State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Guangxi Key Laboratory of rock and Soil Mechanics and engineering Guilin University of TechnologyGuilin541004China

Soil water content(SWC)is one of the critical indicators in various fields such as geotechnical engineering and *** avoid the time-consuming,destructive,and laborious drawbacks of conventional SWC measurements,the image-based SWC prediction is considered based on recent advances in quantitative soil color *** this study,a promising method based on the Gaussian-fitting gray histogram is proposed for extracting characteristic parameters by analyzing soil images,aiming to alleviate the interference of complex surface conditions with color information *** addition,an identity matrix consisting of 32 characteristic parameters from eight color spaces is constituted to describe the multi-dimensional information of the soil ***,a subset of 10 parameters is identified through three variable analytical ***,four machine learning models for SWC prediction based on partial least squares regression(PLSR),random forest(RF),support vector machines regression(SVMR),and Gaussian process regression(GPR),are established using 32 and 10 characteristic parameters,and their performance is *** results show that the characteristic parameters obtained by Gaussian-fitting can effectively reduce the interference from soil surface *** RGB,CIEXYZ,and CIELCH color spaces and lightness parameters,as the inputs,are more suitable for the SWC prediction ***,it is found that 10 parameters could also serve as optimal and generalizable predictors without considerably reducing prediction accuracy,and the GPR model has the best prediction performance(R^(2)≥0.95,RMSE≤2.01%,RPD≥4.95,and RPIQ≥6.37).The proposed image-based SWC predictive models combined with effective color information and machine learning can achieve a transient and highly precise SWC prediction,providing valuable insights for mapping soil moisture fields.

关键词： Soil water content(SWC) Digital image Soil color Color space Machine learning

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

Indo-norwegian Initiative for Enhanced Use of Mineral Waste in Indian Cement and Concrete Industry

引用

武汉理工大学学报 2010年第17期32卷 246-251页

作者： ENGELSEN C J JUSTNES H PAWAN L sintef Building and Infrastructure Oslo 0314Norway sintef Building and Infrastructure Trondheim 7465Norway National Environmental engineering Research Institute Nehru Marg Nagpur 440020India

The industry-oriented-bilateral project ( "Environmental friendly strategy for Waste Management in India Utilising Cement and Concrete Production Technology" ) between India and Norway was established in 2009 and will continue to the end of 2011. It aims to further increase the utilisation of mineral wastes in Indian cement and concrete industry in an environmentally and scientifically sound way in order to ensure sustainable energy and resource management. The project intends to advance the state of the art regarding blended cement and concrete technology as well as provide practical solutions and guidelines. Emphasis are given to the synergies achieved by using ternary binder systems in concrete mixes as well as the use of appropriate admixtures in order to integrate certain waste materials at higher levels than today's practice. The prioritised materials are coal combustion residues,slag and C&D waste. The background,project concept and the current status are presented.

关键词： concrete additive tottom ash fly ash pond ash mineral waste

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

Spatial distribution modeling of subsurface bedrock using a developed automated intelligence deep learning procedure:A case study in Sweden

引用

Journal of rock Mechanics and Geotechnical engineering 2021年第6期13卷 1300-1310页

作者： Abbas Abbaszadeh Shahri Chunling Shan Emma Zall Stefan Larsson Division of rock engineering Tyréns ABStockholmSweden Johan Lundberg AB UppsalaSweden Division of Soil and rock Mechanics KTH Royal Institute of TechnologyStockholmSweden

Due to associated uncertainties,modelling the spatial distribution of depth to bedrock(DTB) is an important and challenging concern in many geo-engineering *** association between DTB,the safety and economy of design structures implies that generating more precise predictive models can be of vital *** the present study,the challenge of applying an optimally predictive threedimensional(3D) spatial DTB model for an area in Stockholm,Sweden was addressed using an automated intelligent computing design *** process was developed and programmed in both C++and Python to track their performance in specified tasks and also to cover a wide variety of diffe rent internal characteristics and *** comparison to the ordinary Kriging(OK) geostatistical tool,the superiority of the developed automated intelligence system was demonstrated through the analysis of confusion matrices and the ranked accuracies of different statistical *** re sults showed that in the absence of measured data,the intelligence models as a flexible and efficient alternative approach can account for associated uncertainties,thus creating more accurate spatial 3D models and providing an appropriate prediction at any point in the subsurface of the study area.

关键词： Automated intelligence system Predictive depth to bedrock(DTB)model Three-dimensional(3D)spatial distribution

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

Slope failure simulations with MPM

引用

Journal of Hydrodynamics 2017年第3期29卷 445-451页

作者： Philip J.Vardon Bin Wang Michael A.Hicks Geo-engineering Section Faculty of Civil Engineering and GeosciencesDelft University of Technology State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences

The simulation of slope failures,including both failure initiation and development,has been modelled using the material point method（MPM）.Numerical case studies involving various slope angles,heterogeneity and rainfall infiltration are *** is demonstrated that,by utilising a constitutive model which encompasses,in a simplified manner,both pre-and post-failure behaviour,the material point method is able to simulate commonly observed failure *** is a step towards being able to better quantify slope failure consequence and risk.

关键词： Heterogeneity material point method(MPM) rainfall-induced slope failure strain softening

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

Development of nonlinear cross-anisotropic model for sands based on state parameter

引用

Journal of Central South University 2013年第7期20卷 1992-2000页

作者：陈成周正明 State Key Laboratory of Geomechanics and Geotechnical engineering (Institute of rock and Soil Mechanics Chinese Academy of Sciences)

Numerous experimental studies reveal that the mechanical and deformational behaviors of sands are dependent on the combined effect of void ratio and stress. To predict this complex behavior of sands, a hypo-elastic model is developed based on the cross-anisotropic elasticity model, which involves four parameters: bulk module, tangent Young's module, volume deformation coefficient and Poisson ratio. A parameter defined as virtual peak deviatoric stress dependent on state parameter is introduced into hyperbolic stress strain relationship to determine tangent Young's module. In addition, an existing fitting equation for isotropic compression curves and an existing dilatancy equation, which can consider the effect of state of sands, are employed to determine bulk module and volume deformation coefficient. Thirteen model constants are involved in the proposed model, the values of which are fixed for a sand over a wide range of initial void ratios and initial confining pressures. Well known experimental data for drained and undrained triaxial compression tests of Toyoura sand are successfully modeled.

关键词： sand state parameter strain work-softening nonlinear elasticity

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 differentiated approach for justification of advanced manufacturing technologies

引用

Advances in Manufacturing 2016年第3期4卷 257-267页

作者： Natalia Iakymenko Erlend Alfnes Maria Kollberg Thomassen Department of Production and Quality engineering Norwegian University of Science and TechnologyTrondheim Norway Industrial Management SINTEF Technology and SocietyTrondheim Norway

European companies rely on advanced manu- facturing technologies （AMTs） in order to succeed in an environment of high labour costs, increasing competition and rising customer expectations. AMT implementation is often a high-risk investment. Many companies experience a misalignment between the installed functionality and pro- duction needs. There is a need for decision support in order to take into account all possible advantages and disad- vantages of the technology implementation, and ensure that the technology meets the requirements of the production processes. In this article, a differentiated technology justi- fication approach is introduced. The approach suggests a combination of strategic, financial and risk justification methods. The recommended number and type of methods depend on the integration level of the technical system under consideration, ranging from stand-alone machines to large and integrated production systems. The approach was developed based on a literature review and a case study. The application of the approach was presented in a case where several types of pipe bending technology were evaluated.

关键词： Automation - Advanced manufacturing -Technology selection Technology justification - Pipebending

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

An improved three-dimensional spherical DDA model for simulating rock failure

引用

Science China(Technological Sciences) 2015年第9期58卷 1533-1541页

作者： JIAO YuYong HUANG GangHai ZHAO ZhiYe ZHENG Fei WANG Long State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences School of Civil and Environmental engineering Nanyang Technological University

In this paper, a discontinuous numerical model, namely SDDARF3D(three-dimensional spherical discontinuous deformation analysis for rock failure), is proposed for simulating the whole process of rock failure. Firstly, within the framework of the classical discontinuous deformation analysis(DDA) method, the formulation of three-dimensional spherical DDA(3D SDDA) is deduced; secondly, a bonding and cracking algorithm is constructed and the SDDARF3 D model is proposed; thirdly, corresponding VC++ calculation code is developed and some verification examples are calculated. The simulated results can intuitively reproduce the failure phenomena of rock mass, indicating that the proposed SDDARF3 D numerical model is correct and effective.

关键词： rock failure three-dimensional spherical discontinuous deformation analysis crack propagation bonding and cracking algorithm

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

Influence of water content and shear rate on the mechanical behavior of soil-rock mixtures

引用

Science China(Technological Sciences) 2018年第8期61卷 1127-1136页

作者： WEI HouZhen XU WenJie WEI ChangFu MENG QingShan State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences State Key Laboratory of Hydroscience and Hydraulic engineering Department of Hydraulic EngineeringTsinghua University

Soil-rock mixtures(S-RMs) are widely distributed in the nature. The mesoscopic deformation and failure mechanisms as well as the macro-mechanical behaviors of the S-RMs depend largely upon the rate of deformation, water content and particle sizes. In this research, a series of large-scale direct shear tests with different water contents and different grain-size distributions were conducted to study the influence of the aforementioned factors on the mechanical properties of the S-RMs. Due to the effect of the rock blocks' breakage in the S-RMs, the relationship between the shear strength and the vertical stress of S-RM follows a power law instead of a linear one. It is found that there exists a threshold value for the vertical stress during the shearing process,below which the soil strength is mainly determined by the inter-locking of particles and the re-arrangement of meso-structure,and otherwise large-sized rock blocks are gradually broken into smaller fragments, resulting in a decrease in the soil *** shear rate can also significantly influence the degree of particle breakage and the meso-structural rearrangement of the SRMs, namely, under low shear rate, the particles of the samples are fully broken resulting in enhanced macro-strength. As a result, the lower the shear rate, the higher the macroscopic strength. So under unsaturated conditions, the water content will affect the strength of the S-RMs by reducing the strength of rock blocks. As the water content increases, the soil strength decreases gradually, and assumes a moderate value when the water content reaches 8%. At the same water content, the soil strength increases with the sizes of large rock blocks. For the occlusion, breakage and structure re-arrangement of the oversized rock blocks inside S-RM, which have a huge influence on the mechanical characteristics of the samples.

关键词： soil-rock mixture(S-RM) direct shear test water content shear rate particle breakage

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 new double reduction method for slope stability analysis

引用

Journal of Central South University 2014年第3期21卷 1158-1164页

作者：白冰袁维李小春 State Key Laboratory of Geomechanics and Geotechnical engineering(Institute of rock and Soil Mechanics Chinese Academy of Sciences)

The core of strength reduction method(SRM) involves finding a critical strength curve that happens to make the slope globally fail and a definition of factor of safety(FOS). A new double reduction method, including a detailed calculation procedure and a definition of FOS for slope stability was developed based on the understanding of SRM. When constructing the new definition of FOS, efforts were made to make sure that it has concise physical meanings and fully reflects the shear strength of the slope. Two examples, slopes A and B with the slope angles of 63° and 34° respectively, were given to verify the method presented. It is found that, for these two slopes, the FOSs from original strength reduction method are respectively 1.5% and 38% higher than those from double reduction method. It is also found that the double reduction method predicts a deeper potential slide line and a larger slide mass. These results show that on one hand, the double reduction method is comparative to the traditional methods and is reasonable, and on the other hand, the original strength reduction method may overestimate the safety of a slope. The method presented is advised to be considered as an additional option in the practical slope stability evaluations although more useful experience is required.

关键词： slope stability strength reduction method double strength reduction method factor of safety limit equilibrium method

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

Coupled thermo-hydro-mechanical-migratory model for dual-porosity medium and numerical analysis

引用

Journal of Central South University 2011年第4期18卷 1256-1262页

作者：张玉军杨朝帅 State Key Laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences

A coupled thermo-hydro-mechanical-migratory model of dual-porosity medium for saturated-unsaturated ubiquitous-joint rockmass was established,in which the stress field and the temperature field were single,but the seepage field and the concentration field were double,and the influences of sets,spaces,angles,continuity ratios,stiffnesses of fractures on the constitutive relationship of the medium were ***,the relative two-dimensional program of finite element method was *** a hypothetical nuclear waste repository as a calculation example,the case in which the rockmass was unsaturated dual-porosity medium and radioactive nuclide leak was simulated numerically,and the temperatures,negative pore pressures,saturations,flow velocities,nuclide concentrations and principal stresses in the rockmass were *** results show that the negative pore pressures and nuclide concentrations in the porosity and fracture present different changes and *** though the saturation degree in porosity is only about 1/10 that in fracture,the flow velocity of underground water in fracture is about three times that in porosity because the permeability coefficient of fracture is almost four orders higher than that of *** value of nuclide concentration in fracture is close to that in porosity.

关键词： ubiquitous-joint rockmass dual-porosity medium thermo-hydro-mechanical-migratory coupling model numericalanalysis

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

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

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

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：