A PROBABILISTIC APPROACH TO EVALUATE SHEAR STRENGTH OF HETEROGENEOUS STABILIZED GROUND BY DEEP MIXING METHOD

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概要

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• The strength of stabilized ground by the "deep mixing method" (D.M.M.) using cement base hardening agent randomly varies from point to point. For example, the coefficient of variation is about 0.3,and almost as same as that of unconfined compressive strength of natural cohesive soils. And its strength shows about 1000〜6000 kN/m^2 which is between those of natural cohesive soils and concrete. On the other hand, the material properties of stabilized soil by D.M.M. have intermediate characteristics between those of natural cohesive soils and concrete. In design, this heterogeneity in the material properties of the stabilized soil makes it difficult to evaluate strength of the stabilized soil as a mass. This paper proposes a method of determining its design strength by using a probabilistic failure model.At first, the unconfined compressive strength of stabilized soils is statistically analized in order to examine the characteristics of its heterogeneity. Then a probabilistic failure model is proposed taking account of its material properties. A bundle model is introduced which is between the average model and the weakest link model. This model is based on the more general assumptions than the conventional models, while the solution is obtained only from numerical integration. An experiment is performed to examine the proposed model. In this experiment, by applying the Monte Carlo method, the heterogeneity of the soil mass is expressed by making some small holes randomly on the direct shear specimens. The experimental results show that the proposed model gives good prediction of the failure probability of the stabilized soil mass. Finally, a practical procedure for determining design strength of the stabilized soil mass is proposed.

• 社団法人地盤工学会の論文
• 1982-03-15

著者

• 本城 勇介

  Gifu University

• 本城 勇介

  Nagaoka University Of Technology

• 本城 勇介

  Division Of Geotechnical And Transportation Engineering Asian Institute Of Technolgy

• 本城 勇介

  TAKENAKA Technical Research Laboratory

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• DETERMINATION OF PARTIAL FACTORS FOR A VERTICALLY LOADED PILE BASED ON RELIABILITY ANALYSIS
• ESTIMATION OF SUBGRADE REACTION COEFFICIENT FOR HORIZONTALLY LOADED PILES BY STATISTICAL ANALYSES
• APPLICATION OF INFINITE ELEMENTS TO SEEPAGE ANALYSIS IN GEOTECHNICAL PERSPECTIVE
• 無限要素の地下水解析への応用(『土質工学会論文報告集』Vol.33,No.1 (1993年3月発行)掲載論文の概要)
• APPLICATION OF INFINITE ELEMENTS TO SEEPAGE ANALYSIS IN GEOTECHNICAL PERSPECTIVE
• 土木分野における性能設計の取り組み
• PREDICTION OF SINGLE PILE SETTLEMENT BASED ON INVERSE ANALYSIS
• PREDICTION OF SINGLE PILE SETTLEMENT BASED ON INVERSE ANALYSIS
• A NEW LOOK AT FLUCTUATING GEOTECHNICAL DATA FOR RELIABILITY DESIGN
• ON THE OPTIMUM DESIGN OF A SMOOTHING FILTER FOR GEOPHYSICAL TOMOGRAPHY
• A NEW LOOK AT FLUCTUATING GEOTECHNICAL DATA FOR RELIABILITY DESIGN
• A PROBABILISTIC APPROACH TO EVALUATE SHEAR STRENGTH OF HETEROGENEOUS STABILIZED GROUND BY DEEP MIXING METHOD

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