检索结果-南通市图书馆

Displacement-based back analysis of mitigating the effects of displacement loss in underground engineering

Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2626-2638页

作者： Hui Li Weizhong Chen Xianjun Tan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Displacement-monitoring-based back analysis is a popular method for geomechanical parameter ***,due to the delayed installation of multi-point extensometers,the monitoring curve is only a part of the overall one,leading to displacement ***,the monitoring and construction time on the monitoring curve is difficult to *** the literature,the final displacement was selected for the back analysis,which could induce unreliable *** this paper,a displacement-based back analysis method to mitigate the influence of displacement loss is developed.A robust hybrid optimization algorithm is proposed as a substitute for time-consuming numerical *** integrates the strengths of the nonlinear mapping and prediction capability of the support vector machine(SVM)algorithm,the global searching and optimization characteristics of the optimized particle swarm optimization(OPSO)algorithm,and the nonlinear numerical simulation capability of *** avoid being trapped in the local optimum and to improve the efficiency of optimization,the standard PSO algorithm is improved and is compared with other three algorithms(genetic algorithm(GA),simulated annealing(SA),and standard PSO).The results indicate the superiority of OPSO ***,the hybrid optimization algorithm is applied to an engineering *** back-analyzed parameters are submitted to numerical analysis,and comparison between the calculated and monitoring displacement curve shows that this hybrid algorithm can offer a reasonable reference for geomechanical parameters estimation.

关键词： Rock mass Intelligent back analysis geomechanical parameters Displacement loss Underground engineering

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

Landslide susceptibility mapping using the infinite slope,SHALSTAB,SINMAP,and TRIGRS models in Serra do Mar,Brazil

引用

Journal of Mountain Science 2022年第4期19卷 1018-1036页

作者： Thiago Machado do PINHO Oswaldo AUGUSTO FILHO University of Sao Paulo Sao CarlosSP13566-590Brazil

Slope failure triggered by heavy rainfall is very common in tropical and subtropical regions and a cause of major social and economic *** susceptibility maps can be generated using geographical information systems(GIS)and limit equilibrium slope stability models coupled or not to hydrological *** study investigated the efficacy of four models used for slope stability analysis in predicting landslide-susceptible areas in a GIS *** selected models are the infinite slope,the shallow slope stability model(SHALSTAB),the stability index mapping(SINMAP),and the transient rainfall infiltration and grid-based regional slope-stability(TRIGRS).For comparisons,the authors(a)included the infinite slope equation in all models,(b)clearly defined input parameters and failure triggering mechanisms for each simulation(soil depth,water table height,rainfall intensity),(c)determined appropriate values for each model to obtain stability levels that represented similar hydrogeotechnical conditions,and(d)considered upper-third areas of landslide scars to estimate the reliability of susceptibility maps using validation *** intense rainfall event occurred in Serra do Mar,Brazil in January 2014 triggered hundreds of landslides and was used for back analysis and evaluation of the slope stability analysis *** rainfall intensity is not considered,the four models produced very similar *** most reliable landslide susceptibility map was generated using TRIGRS and considering the granite residual granite soils geological-geotechnical unit,subjected to a rainfall intensity of 210 mm for 2 h under unsaturated conditions.

关键词： Geographical information system Safety factor Heavy rainfall geomechanical parameters Residual soils of phyllite and granite Serra do Mar

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

Empirical analysis for the characterization of geo-mechanical strength and pressure regime:Implications on hydraulic fracturing stimulation

引用

Petroleum 2019年第3期5卷 260-270页

作者： Dorcas S.Eyinla Michael A.Oladunjoye Department of Earth Sciences Adekunle Ajasin UniversityNigeria Department of Geology University of IbadanNigeria

Among the several activities involved in oil exploration are the determination of hydrocarbon in-place and mechanical competency of the oil *** pressure regimes of the formation have also become vital properties which must be well known to ensure preliminary awareness of the hydraulic *** study seeks to adopt a prediction strategy of the overall geo-mechanical competency and strength of the formation,using a less stressful computational process and an empirical analysis,developed using three wells from ED BON area in parts of Niger *** constants such as Poisson Ratio,Young's,Shear and Bulk moduli which are the parameters for characterizing rock mechanical properties were estimated,as well as the subsurface formation pressures and the associated fracture gradient using P-wave sonic and density *** results from the analysis showed that there is correlation between elastic strength and fracture pressure.

关键词： Elastic strength Hydraulic fracturing Competency Prediction strategy geomechanical parameters

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

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

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：