Articles techniques et présentations

In plate tectonics, the relative motion between plates at a plate boundary generates tectonic stress, and most earthquakes occur at these plate boundaries. However, only a small proportion of earthquakes occur in plate interiors, such as the 1811–12 New Madrid Earthquake (8.1 Mw) in the ... En savoir plus

Ice flows because at low stresses it deforms viscously; the viscosity depends upon the stress. The lubrication approximation (LA) states shear stress is proportional to the product of the ice depth and surface slope. At ice divides the slope and shear stress are zero meaning the ... En savoir plus

Bentonite based materials (BBM) are considered as ideal buffer materials for deep geological repository (DGR) for nuclear wastes because of several desirable properties, such as low permeability, high adsorption capacity and proper swelling ability (Guo and Fall 2018). However, gas ... En savoir plus

Subduction, the process through which the cold and dense oceanic lithosphere sinks into the highly viscous mantle, is the main driving force of plate tectonics and is important for recycling the Earth's materials. Active subduction has not been observed in any other planet in our solar ... En savoir plus

Deep geological repositories (DGRs) are currently being proposed in several countries to deal with the nuclear waste. The safe long-term disposal of the waste is guaranteed by a multi-barrier system, which includes a natural barrier (host rocks) and an engineered barrier system. Large ... En savoir plus

Geological Carbon Storage (GCS) is viewed as a viable option to reduce Carbon Dioxide (CO2) emissions. In particular, CO2 injection into deep saline formations (DSF) has been the subject of numerous investigations during the last decade, including pilot and demonstration projects [Reiner ... En savoir plus

In a pumping test the drawdown of the water table in a piezometer is recorded, as response to pumping from a nearby well. Pumping tests belong into the common toolbox of hydro-geologists, used to obtain basic parameters for aquifer characterization. There are various approaches to ... En savoir plus

了解山地峡谷的风场特性是进行山区建筑规划、桥梁和风力涡轮机的选址等的重要前提。然而目前国内外的研究主要集中在理想化简单山体模型对应的风场特性，实际复杂山体的风场特性研究还较为缺乏。本研究利用Comsol Multiphysics 5.2软件导入高程数据并参数化曲面生成实际峡谷模型，再利用湍流k-ε接口模拟三种不同类型的实际峡谷（平行型，前窄后宽型，前宽后窄型）对应的稳态的风速场，分析并对比其风场特性。模拟结果表明，在进口风速一致的情况下，峡谷越窄的地方风的加速效应越明显，前窄后宽型峡谷内的风场较前宽后窄型峡谷内的风场更加安全。 En savoir plus

Bentonite is a versatile material that is, among other things, envisaged in designs for radioactive waste repositories to protect the waste canisters against groundwater. The thermo-hydraulic-mechanically coupled process of bentonite saturation is commonly based on two-phase flow and a ... En savoir plus

瓦斯与煤自燃复合共生灾害是多尺度、多时度和多物理过程耦合作用的结果，本文开展了井下煤层和采空区松散体等裂隙场中瓦斯与煤自燃共生环境下多场耦合致灾理论的研究，建立了瓦斯与煤自燃复合致灾的判定准则和瓦斯抽采安全度模型，理论揭示了易自燃煤岩体裂隙场瓦斯抽采过程中，CH4浓度场、O2 浓度场和温度场多场交汇致灾过程和控制机理。进一步，基于comsol with matlab软件，集成了瓦斯与煤自燃耦合作用的多模块模型，开发了煤矿煤层、采空区跨尺度裂隙场瓦斯与煤自燃复合共生多场耦合模拟软件，成功应用于煤层和采空区瓦斯抽采案例，获得了瓦斯抽采中煤层和采空区区域安全度的动态演化 ... En savoir plus