Device and method for measuring swelling representation parameters of swelling soil

Abstract

The invention discloses a device and method for measuring swelling representation parameters of swelling soil. The device for measuring the swelling representation parameters of the swelling soil comprises a sample container, a soil body permeation coefficient measurement part, a jacking cylinder applying a vertical load, a dial indicator for testing a swelling soil sample to generate vertical deformation, and a deformation pipe used for testing water seepage coefficients of the swelling soil. The method comprises the steps of: immersing the swelling soil sample into water for swelling stably, measuring the water seepage coefficients; and then electrically heating the swelling soil sample to ensure that the swelling soil sample is dehydrated and contracted stably, and measuring the permeation coefficients of the swelling soil. Therefore, the invention can be used for measuring water seepage and permeation coefficients of the swelling soil in a repeatedly-swelling deformation process by controlling temperature and water content changes of the swelling soil sample in the sample container so as to reflect the change of a fracture and a soil body structure inside the soil body of the swelling soil in the repeatedly-swelling deformation process. In addition, the sample container of the device is connected with an external pipeline through each joint arranged on the sample container, therefore, data measurement in an experiment process is facilitated, and measurement precision of data is increased.

Description

technical field [0001] The invention relates to a measuring device for expansion and contraction characteristic parameters of expansive soil and a method for measuring water seepage and air permeability coefficient in the process of repeated expansion and contraction deformation of expansive soil, which is used for testing the repeated expansion and contraction characteristics of expansive soil under vertical load; it belongs to civil engineering The technical field of geotechnical engineering testing in engineering disciplines. Background technique [0002] Expansive soil is a special clay with multiple cracks and significant expansion and contraction characteristics. It has engineering properties such as multiple cracks, water swelling, dehydration shrinkage and cracking, and repeated expansion and contraction deformation with changes in water content. Expansive soils are widely distributed in my country and even in the world. Many engineering accidents in expansive soil a...

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Problems solved by technology

These three test methods and instruments are simple and convenient, but have significant disadvantages: (1) only a single expansion or contraction test can be carried out, and the expansion and contraction cycle reciprocating deformation test cannot be carried out; (2) only the soil mass can be measured The amount of vertical deformation, the test results cannot reflect the changes in the internal cracks and structures of the soil

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