流-固耦合坝体渗透率的演变机理
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摘要
假设坝体岩土为双孔隙度介质,分析了坝体在流体孔隙压力变化和地应力的耦合作用下力学性能的变化和渗透性的演变规律。通过研究流体在岩土层内流动的规律、岩体变形以及力学强度的变化情况,为坝体稳定性与安全性提供参考。建立了基于流体运动、岩体骨架变形以及渗透率变化的数学模型,并根据模型分析地压与渗透率(孔隙度)变化的规律,为解决工程中的坝体稳定性问题提供理论参考。
The rock of the dam is supposed to be dual-porosity medium and pore pressure in fracture and micro-pores are coupled with the stress in dam.The evolution of the permeability is studied by analyzing the hydraulic pressure and the deformation of the rock.Mathematical models are built to quantify the fluid flow,the deformation of rock skeleton and the net change of permeability.The relations between the pore pressure and permeability(porosity)are also been analyzed and they offer new ideas to solve dam stability problems in engineering.
The rock of the dam is supposed to be dual-porosity medium and pore pressure in fracture and micro-pores are coupled with the stress in dam.The evolution of the permeability is studied by analyzing the hydraulic pressure and the deformation of the rock.Mathematical models are built to quantify the fluid flow,the deformation of rock skeleton and the net change of permeability.The relations between the pore pressure and permeability(porosity)are also been analyzed and they offer new ideas to solve dam stability problems in engineering.
引文
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[8]Chen Zhongwei,Liu Jishan,Elsworth Derek.Impact ofCO2 injection and differential deformation on CO2injectivity under in-situ stress conditions[J].InternationalJournal of Coal Geology 2010,81:97-108.
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[2]Clarkson C R Bustin R M Variation in permeability withlithotype and maceral composition of cretaceous coals ofthe Canadian Cordillera[J].International Journal of CoalGeology,1997,33:135-151.
[3]徐献芝,李培超,李传亮.多孔介质有效应力原理研究[J].力学与实践,2001,23(4):42-45.
[4]Palmer I,Mansoori J.How permeability depends on stressand pore pressure in coal beds:A new model[J].SPEReserv Eval Eng,1998(6):539-544.
[5]薛世峰,宋惠珍.非混溶饱和两相渗流与孔隙介质耦合作用的理论研究—I数学模型[J].地震地质,1999,21(3):243-252.
[6]Yi Jun,Akkutlu I Yücel,Karacan C魻zgen,et al.Gassorption and transport in coals:A poroelastic mediumapproach[J].International Journal of Coal Geology,2009(77):137-144.
[7]Bai Mao,Elsworth Derek.Coupled processes in subsurfacedeformation,flow,and transport[R].Washington DC:American Society of Civil Engineers,2000:30-36.
[8]Chen Zhongwei,Liu Jishan,Elsworth Derek.Impact ofCO2 injection and differential deformation on CO2injectivity under in-situ stress conditions[J].InternationalJournal of Coal Geology 2010,81:97-108.
[9]Warren J,Root P.Behavior of naturally fractured reservoirs[J].Trans Soc Petrol Eng J,1963,228:245-55.
[10]朱冠美,周守贤.三峡二期围堰塑性砼变形性能及影响因素的研究[J].长江科学院院报,1997,14(4):70-73.
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