Method for achieving soft soil foundation treatment by controlling secondary consolidation settlement
A soft soil foundation and treatment method technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of insignificant actual effect, quantitative control of sub-consolidation settlement, etc.
Active Publication Date: 2018-11-13
ZHEJIANG PROVINCIAL INST OF COMM PLANNING DESIGN & RES CO LTD
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Problems solved by technology
Although these methods have continuously improved the effect of preloading drainage and reduced secondary consolidation settlement to a certain extent, none of them has quantitatively controlled secondary consolidation settlement, and the actual effect is not significant
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[0039] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] The core idea of the present invention is: before foundation treatment design, undisturbed soil samples are obtained simultaneously by geological exploration, a series of conventional sub-consolidation tests and super-consolidated soil sub-consolidation tests are carried out, and undisturbed soil sub-consolidation coefficients, conventional geotechnical parameters and over-consolidated soil sub-consolidation tests are obtained. Consolidation test curve; in the design of foundation treatment, in addition to the calculation of conventional stability and primary consolidation settlement, the calculation of secondary consolidation settlement (post-construction settlement) is also performed, and quantified according to the requirements of specific proje...
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The invention discloses a method for achieving soft soil foundation treatment by controlling secondary consolidation settlement. Drainage consolidation and preloading method treatment is carried out on a soft soil foundation, and after the pre-pressing stage is met, unloading and backfilling of an ultra-light material EPS and filling of the pavement structure are carried out; before foundation treatment design, geological prospecting is carried out, meanwhile, undisturbed samples are taken, series conventional secondary consolidation testing and overconsolidated soil secondary consolidation testing are carried out, and series parameters or curved required for design are obtained; and during foundation treatment design, besides conventional stability and total settlement calculation is carried out, secondary consolidation settlement calculation is also carried out, and according to the requirement of specific engineering for foundation post-construction settlement, the thickness of thebackfilled ultra-light material is designed. By means of the method, soft clay can be converted into overconsolidated soil, and therefore the secondary consolidation coefficient of soft soil is reduced, the secondary consolidation settlement of the soft soil layer is reduced, and the aim of controlling post-construction settlement of structures is achieved.
Description
technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for treating soft soil foundation by controlling secondary consolidation settlement. Background technique [0002] Soft soil is also called soft clay, which is the abbreviation of weak cohesive soil. It was formed in the late Quaternary and belongs to the viscous sediments or river alluvial deposits of marine, lagoon, valley, limnic, drowned valley, and delta. Mostly distributed along the coast, in the middle and lower reaches of rivers or near lakes. Common weak cohesive soils are silt and silty soils. Soft clay foundations have low bearing capacity, slow strength growth, easy deformation and unevenness after loading, high deformation rate and long stability time, low permeability, thixotropy and rheology. great features. Commonly used soft soil foundation treatment methods include preloading method, displacement method, mixing method, etc...
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IPC IPC(8): E02D3/10
CPCE02D3/10
Inventor 俞帆
Owner ZHEJIANG PROVINCIAL INST OF COMM PLANNING DESIGN & RES CO LTD