Calculation Method for Lateral Extrusion Deformation of Subgrade Under Subgrade Load
A technology of roadbed and foundation, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., to achieve the effect of simple calculation, accurate calculation results and few parameters
Active Publication Date: 2020-10-13
CHINA RAILWAY 19TH BUREAU GRP 1ST ENG +1
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to solve the shortcomings of the existing measurement methods, and proposes to use the Poisson’s ratio of the observed settlement and the corresponding load state as the basis, and calculate the lateral extrusion deformation corresponding to the observed settlement through a specific formula
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Embodiment
[0031] Example: The main soil layer in this case area is: the surface layer is mostly clay, silty clay, hard plastic to hard shape, 2-8m thick, and partly pebble gravel soil. Below the surface is the alluvial soil layer: cohesive soil, sand, gravel and pebble soil, the alluvial thickness is generally 5-30m, and the local thickness exceeds 50m. Subgrade filler shall be filled with A and B group fillers, the designed filling height of the subgrade is 6.4m, the subgrade width B=46m, and the slope is 1:1.5. The groundwater level is 4.0m, and the foundation is normally consolidated soil;
[0032] 2. Determination of Poisson's ratio indoor test:
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The invention relates to a method for measuring and calculating lateral extrusion deformation of a middle-compressibility normally consolidated soil foundation under a subgrade load, particularly a method for synchronous measurement and calculation of lateral extrusion deformation of a foundation under a subgrade slope toe through measured vertical sedimentation of a sedimentation plate in a middle-compressibility normally consolidated soil foundation. The method is designed for solving a problem that modeling and calculation utilizing finite element and finite difference software at present are high in error. The changing rule of the Poisson ratio of in-situ soil along with confining pressure at each depth is determined through in-situ sampling and an indoor triaxial test, the Poisson ratio is determined according to a subgrade load and an overlaying soil layer load, and the lateral extrusion deformation area of the foundation under the slope toe at each layer is determined through anequation. The method achieves correction based on a high number of local layering sedimentation observation results and a theoretical calculation result so that a theoretical correction coefficient in a layering sedimentation percent is utilized to determine a value for a normally consolidated soil area, and the lateral extrusion deformation of a middle-compressibility normally consolidated soilfoundation in the area is determined. The method has an advantage of a more precise measuring and calculating result.
Description
Technical field: [0001] The invention relates to a method for synchronously measuring and calculating the lateral extrusion deformation of the foundation at the foot of a roadbed slope by using the vertical settlement measured by a settling plate in a moderately compressible consolidated soil foundation. Background technique: [0002] The bearing capacity of medium compressive soil foundation is higher, and the foundation settlement is smaller than that of soft soil. Its distribution area is wide, and most of them belong to normally consolidated soil (that is, basically layered accumulation according to geological age, completely consolidated under the existing self-weight pressure. That is, the existing self-weight pressure is equal to the previous consolidation pressure.) [0003] Due to the subsidence of the foundation under the load of the subgrade, the soil simultaneously undergoes lateral extrusion deformation, which has a greater impact on the side piles and buildings...
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IPC IPC(8): G01N3/08G01B21/32
CPCG01B21/32G01N3/08G01N2203/0256
Inventor 闵树梁丛日广时杰柳帮林孙广超
Owner CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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