报告人：美国 科罗拉多矿业大学 土木与环境工程系 Ning Lu（卢宁）教授

报告题目： What Is the Range of Soil Water Density? Critical Reviews With a Unified Model

                      Soil Sorptive Potential: Root of Matric Suction

报告时间：2018年12月24日 (周一)  上午9: 00

报告地点：信阳师范学院 贤林讲坛

Lecture #1: What Is the Range of Soil Water Density? Critical Reviews With a Unified Model

Abstract. Critical reviews are provided on the experimental and theoretical methodologies on soil water density to identify their limitations, flaws, and uncertainties. Some recent findings on intermolecular forces, interfacial interactions, and soil water retention mechanisms are synthesized to clarify molecular-scale physicochemical mechanisms governing the soil water density. A unified model to quantify soil water density variation is presented.

Lecture #2: Soil Sorptive Potential: Root of Matric Suction

Abstract. Soil water interaction involves two physical mechanisms: capillarity and adsorption. As such, matric potential or the negative of matric suction should reflect both mechanisms.  However, the common definition of matric potential, being the pressure difference between pore water and pore air pressure, overlooks the adsorption.  The adsorption can be captured in a new concept called soil sorptive potential. A general definition of matric potential or matric suction is postulated. This new definition of matric suction provides thermodynamic ways to bridge the gap between pore water pressure and soil sorptive potential, and to quantify soil freezing curve, soil water density, and soil water cavitation.

Biographical Sketch

Ning Lu is professor of civil and environmental engineering at Colorado School of Mines (CSM) and the director of the joint CSM/US Geological Survey Geotechnical Research Laboratory in Golden, CO. He is a recipient of the ASCE 2007 Norman Medal, of the ASCE 2010 Croes Medal, of the ASCE 2017 Ralph B. Peck Award, and of the ASCE 2017 Maurice Biot Medal, as well as a fellow of ASCE, Engineering Mechanics Institute, and Geological Society of America. His primary research interests are flow and stress laws in multiphase porous media, rainfall-induced instability of natural and engineered slopes, geologic hazards, energy storage in porous media, and subsurface nuclear waste isolation. He is the senior author of the widely used textbook Unsaturated Soil Mechanics (John Wiley and Sons, 2004) and the textbook Hillslope Hydrology and Stability (Cambridge University Press, 2013). Both books are translated into Chinese and published by The Chinese Higher Education Press.