Collaborative Research: Coupled Thermal-Hydrological-Mechanical-Chemical-Biological Experimental Facility at DUSEL Homestake

该项目将为一个大型地下实验设施开发一个初步设计和工作分解结构，以研究深部裂隙岩石中的耦合thermal-hydrological-mechanical-chemical-biological过程。该实验将是南达科他州Homestake矿拟建的深部地下科学与工程实验室(DUSEL)的一部分。许多天然和工程地球系统涉及岩石中多种过程的耦合，这些过程在不同的尺度上有所不同。地球上最普遍的过程？S地壳产生强耦合现象的是流体(水、二氧化碳、碳氢化合物、岩浆)在应力作用下通过断裂的加热岩石的流动。在广泛的地质工程和地质科学工作中，了解流体渗入的岩石的反应性、变形性、生命维持和运输性质的变化是重要的。尽管有这种基本的重要性，但相互作用仍然很难理解。该项目将：(1)确定霍姆斯塔克岩石的性质：地质、地球化学、机械、热、同位素和反应性。(2)放大这些数据，以阐明传输机制(传导和对流)、裂缝中的自然反应速率和微生物群落进化。(3)评估监测策略、现场探头和取样方法以及必要的措施。(4)选择用于评价耦合过程的候选站点。(5)建立工作分解结构。(6)开发一个耦合的数值模型，以评估对岩体的潜在影响以及优化的加热器配置、功率和井眼方向的监测。这些实验的模型和见解将对工程系统具有广泛的适用性，例如增强型地热系统、二氧化碳封存和地下污染物传输。教育外展将包括参观设施和旅行基准？模型？演示实验。

This project will develop a preliminary design and work-breakdown-structure for a large-scale subsurface experimental facility to investigate coupled thermal-hydrological-mechanical-chemical-biological processes in fractured rock at depth. The experiment will be part of the proposed Deep Underground Science and Engineering Laboratory (DUSEL) in the Homestake Mine, South Dakota. Many natural and engineered earth systems involve coupling of multiple processes in rocks that vary across a wide range of scales. The most pervasive process in the Earth?s crust that gives rise to strongly coupled phenomena is the flow of fluids (water, CO2, hydrocarbons, magmas) through fractured heated rock under stress. Understanding changes in the reactivity, deformability, life-supporting and transport properties of rocks that fluids infiltrate is important in a broad range of geological engineering and geological science endeavors. Despite this fundamental importance, the interactions remain poorly understood.The project will: (1) Determine properties of Homestake rocks: geological, geochemical, mechanical, thermal, isotopic, and reactivity. (2) Upscale these data to elucidate transport mechanisms (conductive versus convective), natural reaction rates in fractures, and microbial community evolution. (3) Evaluate monitoring strategies, in-situ probes and sampling methods, and necessary measurements. (4) Select a candidate site for the evaluating coupled processes. (5) Develop a work-breakdown-structure. (6) Develop a coupled numerical model to evaluate potential effects on the rock mass and optimal heater configuration, power, and monitoring borehole orientations.The models and insight from these experiments will have broad applicability to engineered systems, e.g., enhanced geothermal systems, CO2 sequestration and subsurface contaminant transport. Educational outreach will involve facility tours and a traveling benchscale ?mock-up? demonstration experiment.