Sandy soil water-immersion testing method for loess collapsible deformation

Abstract

The invention discloses a sandy soil water-immersion testing method for loess collapsible deformation. The method includes the steps: digging an exploratory well on the stratum surface, and taking collapsible loess below the exploratory well as to-be-tested soil mass; selecting a bearing plate, fixing a sedimentation rod above the bearing plate, and mounting a soil pressure gauge on the bearing plate; removing dig fictitious soil at the bottom of the exploratory well, laying a sand bed, placing the bearing plate on the sand bed, and enabling the measuring signal line of the soil pressure gauge to extend out of the stratum surface upwards; and filling sand gravels in the exploratory well, filling water after sufficient sand gravels are filled, and measuring the earth pillar pressure formed by the sand gravels by the soil pressure gauge, wherein sedimentation displacement change of the sedimentation rod refers to collapsible deformation of the collapsible loess. By the sandy soil water-immersion testing method for loess collapsible deformation, the defects of disturbance of soil sample obtaining and sample preparation on loess structuredness in indoor collapsibility tests, high on-site water-immersion test pit testing cost and limited testing points are overcome.

Description

technical field [0001] The invention belongs to the technical field of rock and soil testing in loess areas, and in particular relates to a sand soaking test method for loess collapsibility deformation. Background technique [0002] The collapsibility of loess and its evaluation methods have always been a technical problem that has been concerned and studied in the field of geotechnical engineering in loess areas. There are two main methods for testing and evaluating the collapsibility of loess and the collapsibility of the foundation: one is to collect undisturbed loess in layers on site, and test the water-immersion and collapsibility test of loess samples under the condition of indoor uniaxial compression confining deformation stress. For the collapsibility coefficient, the collapsibility deformation of each soil layer with the same collapsibility is firstly calculated layer by layer, and then the sum is calculated to evaluate the collapsibility deformation of the site fo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sand soaking test method for loess collapsibility deformation, which can not only reflect the in-situ loess structure, but also realize multi-point testing, and overcome the difficulties of taking soil samples and preparing samples for indoor collapsibility tests. Structural disturbance of the loess, and insufficiency of high cost and limited test points for field immersion test pits

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