The Effect of Internal Scales in Soil Behavior

土壤和裂隙岩石的性质是由这些介质的离散性质和多个内部尺度的固有存在决定的。事实上，越来越明显的是，土壤参数的均值和方差不足以表征土体和预测其现场行为。此外，为了更好地理解土壤行为，需要理解尺度的微妙而重要的方面以及尺度之间的相互作用。这项研究的目的是在多个内部尺度(空间和时间)共存的情况下辨别土壤中的独特现象，以及它们对土壤宏观尺度行为的影响。建议的研究集中在以下岩土过程：扩散(选择是因为它对内部尺度明显不敏感)、排水应力-应变特性、孔压(产生、耗散和耦合)。这些进程将通过综合实验和分析任务加以处理。一个互补性的研究阶段将推动工程设计程序的发展。这项研究有可能澄清和基本解释在地质力学和地质环境情况下经常观察到的行为，并发现与多个尺度及其相互作用有关的独特现象。这项研究的结果将指导开发解释高分辨率场地特征数据的增强程序(例如，压电CPT和地球物理测试，如探地雷达和层析图像)。此外，这些成果还将促进改进的工程设计方法的发展，这些方法能够识别全球响应的多个内部尺度(基础工程、动态响应、污染和补救、石油地质力学)。

***9908390SantamarinaThe behavior of soils and fractured rocks is determined by the discrete natureof these media and by the inherent presence of multiple internal scales.Indeed, it is increasingly more apparent that the mean and variance of soilparameters are not sufficient to characterize a soil mass and to predict itspotential behavior. Furthermore, subtle yet important aspects of scales andinteractions among scales need to be understood to better comprehend soilbehavior. The goal of this study is to discern unique phenomena in soils given thecoexistence of multiple internal scales (spatial and temporal), and theireffect on macroscale soil behavior. The proposed study centers on the followinggeotechnical processes: diffusion (selected because of its apparentinsensitivity to internal scales), drained stress-strain behavior, porepressure (generation, dissipation and coupling). These processes will beaddressed with integral experimental and analytical tasks. A complementaryresearch phase will be driven towards the development of engineering designprocedures.This research has the potential for the clarification and fundamentalexplanation of frequently observed behavior in geo-mechanic andgeo-environmental situations, and for the discovery of unique phenomena relatedto multiple scales and their interaction. Results from this research will guidethe development of enhanced procedures for the interpretation ofhigh-resolution site characterization data (e.g., piezo-CPT and geophysicaltests such as GPR and tomographic images). Furthermore, these results will alsopromote the development of enhanced engineering design methodologies thatrecognize multiple internal scales in global response (foundation engineering,dynamic response, contamination and remediation, petroleum geomechanics).***