非固结储水系统形变的体积互换机理及意义

VOLUMES EXCHANGE MECHANISM AND SIGNIFICANCE FOR DEFORMATION OF UNCONSOLIDATED GROUNDWATER DEPOSIT SYSTEM

从不同假定条件下质量守恒方程的物理意义分析入手 ,提出了反映非固结储水系统形变量与地下水补排水量关系的体积互换机理的理论 ,为抽注地下流体导致的地形变量的计算及允许开采量的确定提供了理论依据 ,阐明了储水层形变的水动力学原因在于渗流的非稳定过程。从环境地质及水文地质角度探讨了由于体积互换机理导致的非固结储水层的形变模型与水流模型耦合的必然性以及重新定义非固结储水层随时间变化的导储水参数的必要性。研究成果加深了对地层形变尤其是人类抽注地下流体导致的地层形变灾害 (如地裂缝、地面沉降、井管折损等地质灾害 )产生机理的理解 ,为进一步完善地层形变与渗流理论指出了新的研究方向。

After the physical meaning of mass balance equations based on different assumptions has been analyzed, the volumes exchange mechanism theory, which reflects the relationship between deformation quantity of unconsolidated groundwater deposit system and the relation of groundwater recharge-discharge is developed. The mechanism is the theorectical basis for calculating the deformation quantity,for explaining why groundwater deposit layer deformation results from unsteady seepage process according to hydrodynamics and for determining the allowed exploitation. Inevitability for coupling deformation model and groundwater flow model and necessity for redefinition of timevarying hydraulic conductivity and storage are emphasized in light of environmental geology and hydrogeology. These research results help us to understand theoretically the mechanisms of layer deformation disasters (land subsidence, ground fissures and well pipe damage) related to pumping/infusing fluid from/to underground, and point out further research directions for layer deformation theory and seepage theory.