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Seepage-stress coupling constitutive model of anisotropic soft rock

Journal of Central South University 2009年第1期16卷 149-153页

作者：张向霞杨林德闫小波 Research Center for Urban Safety and Security Kobe University 1-1 Rokkodai-cho Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University College of Civil Engineering Fuzhou University

To provide a seepage-stress coupling constitutive model that can directly describe the seepage-stress coupling relationship, a series of one-dimensional seepage-stress coupling tests on two kinds of soft rock (argillaceous siltstone and brown mudstone) were performed by using an MTS-815.02 tri-axial rock mechanics test system, with which the stress-strain curves according to the seepage variation were obtained. Based on the experimental results and by employing Hooke's law, the formulation of the coefficient of strain-dependent permeability was presented and introduced to establish a coupling model. In addition, the mathematical expression and the incremental formulation for coupling model were advanced, in which five parameters that can be respectively determined by using the experimental results were included. The calculated results show that the proposed coupling model is capable of simulating the stress-strain relationship with considering the seepage-stress coupling in the nonlinear elastic stage of two kinds of soft rock.

关键词： soft rock stress--strain relation seepage-stress coupling constitutive model coefficient of permeability

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Geotechnical Perspective of the Causes of Cracks in Building of University Campus(Sindh University Jamshoro Sindh Pakistan)

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Journal of Building Material Science 2021年第1期3卷 51-57页

作者： Mushtaque Amed Pathan Maryam Maira Arif Khaskheli Agha Jamshed Center for Pure&Applied Geology University of SindhJamshoroPakistan Institute of Environmental Engineering&management Mehran UniversityJamshoroPakistan Material Engineer Prof.Dr.G.B Khaskheli Civil Engineering Lab.JamshoroPakistan Deparment of Architecture Engineering Mehran UniversityJamshoroPakistan

The building construction throughout world faces the defects from normal to heavy and destructive like cracks and fractures which cause damages and eventually collapses to heavy life losses alongside economical and *** cracks like structures are found in wall and columns *** the aim of the study,the international experts have classified the minimum allowable standards of those defects which can not be harmful to buildings and other people living *** research study has been administered to research the most reasons to research the causes of cracks during a newly completed and used buildings in where some distinct cracks appeared immediately and after some *** these cracks seem in almost in walls,columns,beams,and so-like structures having different *** foremost useful and customary methods consisting of reconnaissance survey;building inspection and laboratory testing were wont to investigate the causes of those distinct cracks which will cause the formation of cracks were considered and analyzed by the utilization of reconnaissance survey,factors like width,pattern,and conditions of the cracks were identified during the building inspection stage and therefore the soil properties associated with the creation of cracks were determined during the laboratory *** the results of the study;there was no distinct evidence of things like a matured system which will cause the creation of cracks within the building;The pore water pressure during this sort of soil takes longer time to fade,which may be expressed by the very low value of the coefficient of permeability(1.90x 10-7 to 2.15 x 10-7 m/s)acquired from different soil samples collected from the study *** the cracks during this sort of building were found to be caused by the settlement of the building thanks to the character of the predominant soil type that was found within the study area,all the cracks are active cracks with their width increasing with time and the

关键词： Buildings Cracks Plasticity indices coefficient of permeability Pore water pressure Moisture content Differential settlement

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