Strain type lateral expansion force testing device and measuring method

Abstract

The invention relates to a strain type lateral expansion force testing device and a measuring method. The strain type lateral expansion force testing device comprises a measuring device, a data collecting device and a loading device. The measuring method comprises the following steps of performing water soaking expansion testing on specimens with same initial wet density states under non-load andnon-lateral strain conditions, and obtaining the expansion limit water content and corresponding dry density of the specimens with same initial wet density states under the condition of stable expansion; performing gradual loading type cementing testing on the specimens with same initial wet density states under the conditions of expansion limit water content and corresponding dry density, measuring the lateral pressure coefficient K0 at different dry densities, and stripping the lateral expansion force from the lateral resultant force. The strain type lateral expansion force testing device and the measuring method have the advantages that the testing method and the device are simple, the operation is convenient, the structure is reasonable, and the manufacturing cost is economical; the problem of stability of expanded soil edge slope after wetting expansion in the long-time expected precise evaluation process of the field is solved, the important design parameters are provided for thedesign of engineering structures and wall back buffer layers in the expanded soil area, and the device and the method are suitable for being popularized and applied in engineering.

Description

technical field [0001] The invention discloses a strain-type lateral expansion force test device and a measurement method; it is especially used for testing the expansion caused by expansive soil moistening after expansive soil soaks in water and produces different degrees of horizontal expansion and deformation under different overlying loads. lateral expansion force. It belongs to the technical field of geotechnical engineering. Background technique [0002] Expansive soils are found in 46 countries on six continents. This kind of special soil exists in 26 provinces and regions in my country, and more than 300 million people live in expansive soil areas. Expansive soil is rich in montmorillonite and its mixed-layer minerals. After absorbing water, it will expand significantly. If the expansion is limited, it will generate expansion force, which often causes sliding or overturning damage to supporting structures in expansive soil areas. Shallow surface light structures su...

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Problems solved by technology

[0010] From the situation introduced above, it can be seen that there are currently invention patents for testing the lateral expansion force, but there are two shortcomings: (1) the total lateral force generated after the expansive soil is soaked in water is measured, and the lateral force is divided into two types: Two kinds of force, one is the lateral static earth pressure due to the upper load, and the other is the lateral expansion force due to the limited expansion and deformation of expansive soil due to water absorption

(2) It is impossible to obtain the lateral expansive force generated by expansive soil after lateral expansion of different degrees

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