Determination method of e-logp' curves of soil bodies after being disturbed

Abstract

The invention belongs to the field of geotechnical engineering, and discloses a determination method of e-logp' curves of soil bodies after being disturbed. The determination method of the e-logp' curves of the soil bodies after being disturbed comprises the steps that the division information, physical and mechanical information and engineering design parameters of soil layers are obtained; consolidation compression test is carried out, and e-logp' curves of undisturbed soil and remolded soil are drawn, the preconsolidation pressure, the compression index and rebound index of the undisturbedsoil and the compression index of the remolded soil are is determined; indoor undrained triaxial compression tests are conducted to obtain q-gamma<s> curves of the soil bodies of the soil layers underdifferent confining pressure, the failure shear strain is determined; a three-dimensional numerical model is established to simulate the construction process, and the soil shear strain of the soil bodies after being disturbed is determined; the disturbance degree of the soil bodies after being disturbed is determined; apparent self-weight stress, apparent yield stress, the compression index and rebound index of the soil bodies after being disturbed are determined; and the e-logp' curves of the soil bodies after being disturbed are determined. According to the determination method of the e-logp' curves of the soil bodies after being disturbed, a more reasonable basis is provided for prediction of soil body deformation in actual engineering.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a method for determining the e-logp' curve of soil after being disturbed. Background technique [0002] For large-scale projects on soft soil foundations, such as railways, highway embankments, airport runways, housing construction, subway tunnels, dams, bridges, etc., the foundation settlement after construction is the key to the success of the project, and excessive settlement deformation may cause structural damage, dumping, etc. Serious engineering accident. Usually, the post-construction settlement needs to be determined at the beginning of the design, and the foundation settlement calculation method used is established based on the compressive properties of the soil and the e-logp' curve of the soil. Generally speaking, engineering construction will inevitably cause disturbance to the foundation soil. After the soil is disturbed, its engineering properti...

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Problems solved by technology

Although Hong and Onitsuka et al. proposed the e-logp' curve after soil disturbance in "A method of correcting yield stress and compression index of Ariake clays for sample disturbance" published in "Soils and Foundations" in 1998, but the curve It is only a general trend, and does not give a specific method of determination

[0004] From the perspective of engineering practice, there are currently two main problems: first, only based on the indoor research results of reshaping soil samples without considering the changes in engineering properties after the soil is disturbed, the soil resistance will be underestimated The ability to deform and destroy, so that the design is more secure, resulting in economic waste; second, only recognize the characteristics of low compressibility of natural soft clay in a lower stress state, but ignore when the stress level exceeds the yield stress and The rapid increase in compressibility of the soil after being disturbed will overestimate the ability of soft clay to resist deformation, which will bring hidden dangers to engineering safety

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