INCREASE IN UNDRAINED SHEAR STRENGTH OF CLAY WITH RESPECT TO RATE OF CONSOLIDATION

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概要

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• Estimating increase in undrained shear strength s_u of clay is an important purpose of consolidation analysis as well as settlement prediction when multi stage loading for construction of earth structures on soft clay is concerned. The present paper investigates the increase in s_u with regard to rate of consolidation. Since values of s_u are usually evaluated as a function of effective vertical stress σ'_v, rate effect on shear strength increment ratio in normally consolidated state s_<un>/σ'_v is first discussed considering the fundamental concept expressed by the equation of s_<un>/σ'_v=s_<uf>/σ'_y, in which s_<uf> is in-situ undrained shear strength and σ'_y is consolidation yielding stress. The paper also describes two case histories where actual increases in s_u were observed in soft clay deposits. The first site is located offshore Osaka-bay where a large-scale seawall was constructed, and soft clay in the site was improved by sand drains. The second is a reclaimed land in Yanai City where a sand fill and a subsequent test embankment were conducted on a soft clay deposit without improvement by vertical drains. It is found from the study that: (1) rate effect on s_<un>/σ'_v cancels rate effect on σ'_y, and the equation mentioned above is valid regardless of the rate of consolidation, and (2) the in-situ values of s_<un>/σ'_v observed in the two sites vary from 0.27 to 0.37 as consolidation progresses, and they are well related to rate of consolidation. According to the experience at the two construction sites, values of s_<un>/σ'_v with regard to rate of consolidation are proposed for design use at field/construction sites.

• 社団法人地盤工学会の論文

著者

• Yasuhara Kazuya

  Department Of Urban And Civil Engineering Ibaraki University

• SUZUKI KOJI

  Design Department, Civil Engineerring Headquarters, Toa Corporation, Japan.

• Suzuki Koji

  Design Department Civil Engineering Division Toa Corporation

関連論文

• RELIABLE LAND SUBSIDENCE MAPPING USING A SPATIAL INTERPOLATION PROCEDURE BASED ON GEOSTATISTICS
• TWO CASE STUDIES OF CONSOLIDATION SETTLEMENT ANALYSIS USING CONSTANT RATE OF STRAIN CONSOLIDATION TEST(Closure)
• INCREASE IN UNDRAINED SHEAR STRENGTH OF CLAY WITH RESPECT TO RATE OF CONSOLIDATION
• PERFORMANCE OF BAND SHAPED VERTICAL DRAIN FOR SOFT HAI PHONG CLAY

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