Method and equipment for preparing remolded soil specimen

Abstract

The invention discloses a method and equipment for preparing a remolded soil specimen. According to the equipment and the method, a lower adjusting disc containing a reaction frame is provided with a specimen mold group, the bottom of an upper adjusting disc on the reaction frame is provided with a piston pneumatic cylinder; the reaction frame is put in a water storage barrel filled with water; the specimen mold group comprises three specimen molds, and the interfaces of the three specimen molds are respectively provided with an annular water-permeable pad; gas-removed water is introduced into a thorough inner hole of the specimen mold group for fully being blended with soil, the pressure-shaft push rod of the piston pneumatic cylinder and a pressurization cover plate are moved to the thorough inner hole of the specimen mold group by pressurization, the pressure gas drives the pressure-shaft push rod and the pressurization cover plate to pressurize the soil; and after the specimen is compacted tightly, a jack is utilized to push out the specimen, and the specimen can be utilized to perform various tests. The beneficial effects comprise that the operation is simple and convenient; the specimen has complete integrality, is uniform in compactness distribution, does not generate phenomena of layers and discontinuous interfaces; and the subsequent saturation-state finishing process is accelerated.

Description

technical field [0001] The invention relates to a method and equipment, in particular to a method and equipment for making a heavy mold soil test body. Background technique [0002] In the indoor test of manipulating soil, the specimens used include on-site sampling and remodeling specimens. Layer compaction is often used for heavy model specimens for making cohesive soils. However, for the heavy model specimen of cohesive soil, the method of layered compaction of the specimen will have the following disadvantages, which will affect the overall uniformity, compactness and saturation. For example: the compactness of each layer is not easy to control, resulting in different dry unit weights of each layer, and the overall dry unit weight is the average value of the unit weights of each layer, rather than the actual unit weight of uniform distribution; layering is easy to form smooth At the lower level, the interface soil particles are not fully embedded with the upper and...

AI Technical Summary

Problems solved by technology

However, for heavy model specimens with cohesive soils, the method of compacting the specimens in layers will have the following disadvantages, which will affect the overall uniformity, compactness and saturation

For example: the compactness of each layer is not easy to control, resulting in different dry unit weights of each layer, and the overall dry unit weight is the average value of the unit weights of each layer, rather than the actual unit weight of uniform distribution; layering is easy to form smooth At the lower level, the interface soil particles are not fully embedded with the upper and lower layers of the test body, which may easily cause the discontinuity of the layered position; due to its low permeability, the saturation of the test body must take a long time to complete; saturation During the process, degassed water may also flow upward along the interface between the test body and the rubber film through the bottom of the test body, so that the inside of the test body cannot be fully saturated; since the test equipment must perform the action of saturating the test body, if Increase the waiting time for saturation, then this sample saturation period can no longer be used to operate other test work

In addition, the production of traditional cohesive heavy mold specimens is mostly carried out by manual layering and compaction. Skilled technology is required to maintain the quality of the specimens at a uniform standard, and the follow-up work of specimen saturation will take a long time. time to complete

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