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Site soil type

2019-10-28View Original

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What do the terms I0, I1, II, III for site soil types mean in the building seismic design codes? I don’t understand it.:(
Reply #22019-10-28
Classification of the construction site in accordance with relevant regulations, based on factors such as the thickness of the covering layer at the construction site and the equivalent shear wave velocity of the soil layers. It is used to reflect the comprehensive amplification effect of different site conditions on seismic vibrations of bedrock.
Reply #32019-10-29
That’s incorrect; this is not the type of soil found in the site. This is the venue category.
Reply #42019-11-01
Check the geological survey report; the lower the value, the better.
Reply #52019-11-02
Please ask an expert to explain; I only know how to use it
Reply #62019-11-02
This post was last edited by zhangjuhua on 2019-11-2 at 14:36. Category I is considered the most favorable, while categories II, III, and IV become progressively less favorable as soil conditions worsen. The following information was found via Baidu search: It is a classification of construction sites based on factors such as the thickness of the overlying layer and the equivalent shear wave velocity of the soil layers, in accordance with relevant regulations. It is used to reflect the comprehensive amplification effect of different site conditions on seismic vibrations of bedrock. Class I site soil: rock, compacted gravelly soil. Class II site soil: moderately dense to loose gravelly soil, dense to moderately dense gravel, coarse, and medium sand ; Clay soil with an allowable bearing capacity of the foundation soil > 150 kPa. Soil in Category III: loose gravel, coarse and medium sand; compact or moderately compact fine and silt; clays with an allowable bearing capacity of ≤150 kPa, and fill materials with a bearing capacity of ≥130 kPa. Class IV site soil: silty soil, loose silt and fine sand, recently deposited clay ; Allowable bearing capacity of foundation soil
Reply #72019-11-04
It must be related to the bearing capacity of the foundation
Reply #82019-11-06
When calculating, where can I find out which option to choose for each location: I0, I1, II, or III?

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