裂隙-孔隙岩体双渗流时效性结构组分差异机制研究——理论模型与实验验证

A complicated process of fluid flow is occurred in a double permeability rocks with assumption of a fracture-matrix model. Making a reasonable simulation is a key to solve a lot of issues of science and engineering. Presently, although there were many achievements related with the theory of fluid flow within fractured porous rocks, the issues about the time-effect of fluid flow in double permeability rocks were hardly explained better from current theories. Based on double porosity model and system analysis principle, in this project, the research group plans ot set up a theoretical model of fluid flow within a fractured porous rock, suggest a group of general expressions in consideration of the mechanism of time-effect occurrence of fluid flow herein, and reveal the porosity-variability mechanism leading to the time-effect. Another, on basis of a series of experiments of 1-D fluid flow along double porosity continuum, the theoretical model of fluid flow will be corrected and verified from a laboratory-scale. On combining with practical engineering from the existing or published cases, and by simulating the process of evolution of fluid flow under the action of environmental loads, a series of evaluation methods and statistic models for engineering-scale rock, which are based on the proposed theoretical model and appropriate to practical engineering, will be sum up. By means of the researches recommended in this project, the theoretical basis of simulating hydraulic behaviors of fluid flow within a fractured porous rock will be provided. This work would be meaningful and positive theoretically to improve and develop the sciences of underground water and geological engineering.

地下水在裂隙-孔隙双渗透岩体介质中将发生复杂渗流过程，有效模拟这些过程是解决许多重大科学和工程问题的关键。目前有关岩体渗流及其理论研究虽有众多成果，但对裂隙-孔隙双渗透岩体的渗流作用及其时间效应问题还远未达到应有的理论认识高度。本项目基于双重介质模型及系统分析原理，建立裂隙-孔隙双渗透岩体介质渗流理论模型，提出能考虑裂隙-孔隙双渗流时间效应产生机制的一般表达式，揭示裂隙-孔隙双渗流时间效应产生的岩体结构组分差异机制；开展室内一维双渗流试验，从试验尺度对所建双渗流时间效应理论模型进行校正和验证；结合本地区工程实际和已公布的工程案例，模拟环境荷载作用下工程岩体双渗流演化过程，总结一套以所建理论模型为基础，工程岩体双渗流模拟评价方法及其时效性特征统计规律模型。本研究将为模拟裂隙-孔隙双渗透岩体介质渗流演化的水力行为提供理论基础，对完善和发展地下水科学及地质工程学科具有积极的理论意义。

地下水在裂隙-孔隙双渗透岩体介质中将发生复杂渗流过程，有效模拟这些过程是解决许多重大科学和工程问题的关键。目前有关岩体渗流及其理论研究虽有众多成果，但对裂隙-孔隙双渗透岩体的渗流作用及其时间效应问题还远未达到应有的理论认识高度。本项目基于双重介质模型及系统分析原理，建立了裂隙-孔隙双渗透岩体介质渗流理论模型，提出了能考虑裂隙-孔隙双渗流时间效应产生机制的一般表达式，揭示裂隙-孔隙双渗流时间效应产生的岩体结构组分差异机制；开展了室内一维双渗流试验，从试验尺度对所建双渗流时间效应理论模型进行校正和验证；结合本地区工程实际和已公布的工程案例，模拟环境荷载作用下工程岩体双渗流演化过程，总结了一套以所建理论模型为基础，工程岩体双渗流模拟评价集总分析方法。本研究将为模拟裂隙-孔隙双渗透岩体介质渗流演化的水力行为提供理论基础，对完善和发展地下水科学及地质工程学科具有积极的理论意义。