undrained
3.Fundamental behavior and constitutive modeling of a CDG residual soil under undrained shear
4.A nearly level area at the bottom of an undrained desert basin, sometimes temporarily covered with water.
5.Based on a series of isotropically consolidated-undrained tests (CIU) on Hangzhou clay a linear relationship between the normalized initial tangent modulus number,Ei, and stress-path parameter, a, is found for four different stress paths, and stress-path dependent modulus equations derived.
6.According to the test results of localization and shear bands formation under the consolidated undrained plane strain compression tests on soft clay in Shanghai, it was found that the deviator stress of shear band beginning to form was very close to its yield point in clay soils.
7.According to theunconfined compression test, the triaxial test and the consolidated undrained shear test,the paper studies the properties of the cement-bess at Longxi region, discusses itsstress-strain relations, shear strength and the factors which affect its stress-strainrelations.
8.The undrained behaviors of a compacted clay with positive dilatancy and a medium sand with negative dilatancy wera predicted using above-mentioned three models, Duncan EB and linear elastic model with parameters determined from the CD test data.
9.Through years of practice in Huanghua Lough,a set of static cone penetration test formula has been obtained for vacuum preloading foundation in soft soil area by researching on the correlativity among cone point resistance,physico-mechanical indexes in 11 projects. The set of formula has important reference sense to calculate the foundation bearing capacity,modulus of compressibility,undrained shear strength,ultimate side resistance of pile,and to assess the character of vacuum preloading foundation in soft soil area.
10.This paper is emphasized on studying the law of consolidation and creep strain when simple load or repeated load is applied under the drained or undrained condition on the basis of indoor test, the law of decreasing of coefficient of earth pressure at rest K_O(t)under drained state and the law of soil shear stress relaxation, as well as the law of increasing of lateral pressure coefficient during relaxation. Application of those laws in practical engineering is also introduced in this paper.
