A unified model for estimating the in-situ small strain shear modulus of clays, silts, sands, and gravels

作者：Carlton Brian D^*; Pestana Juan M

来源：Soil Dynamics and Earthquake Engineering, 2016, 88: 345-355.

DOI：10.1016/j.soildyn.2016.01.019

• Shear modulus
• Small strain
• In-situ
• Mixed effects regression

This paper proposes a unified model to estimate the in-situ small strain shear modulus of clays, silts, sands, and gravels based on commonly available index properties of soils. We developed a model to predict the laboratory small strain shear modulus (G(max,lab)) using a mixed effects regression of a database that contains 1680 tests on 331 different soils. The proposed model includes the effect of void ratio, effective confining stress and overconsolidation ratio as well as plasticity index, fines content, and coefficient of uniformity. We compiled a second database to estimate the in-situ small strain shear modulus (G(max,in-situ)) from laboratory (G(max,lab)) measurements. This study validated and compared the resulting model with other existing models using a third database of measured G(max,in-situ) values. The residuals of the proposed model had a mean and median closer to zero and the smallest standard deviation of all the models considered. By including a statistical description of the residuals, this work allows uncertainty of the small strain shear modulus to be included in probabilistic studies.

• 出版日期2016-9