Determining method for cracking water content of swelling soil and determining device

Abstract

The invention discloses a determining method for cracking water content of swelling soil. The method comprises the following steps: (1) preparing at least two soil samples of same swelling soil and treating the soil samples till being saturated; (2) dehumidifying the saturated soil samples; (3) dehumidifying for a period of time, taking out the soil samples and measuring the water content of one soil sample, wherein the water content is an initial water content; (4) performing water penetration on the other soil sample for a period of time and determining different values of the penetrating rate of water following the change of the time; (5) repeating the steps (1) to (4), repeatedly testing and changing the dehumidifying time of the soil samples, thereby acquiring different values of the penetrating rate of the soil samples following the change of the time within the next period of time under the condition of different initial water contents; and (6) settling the test data and confirming the cracking water content of the soil samples. The determining method disclosed by the invention researches the gaps according to the water content, has repeatability and can repeatedly test according to the research requirement. The device has a simple structure, convenience in mounting and low cost.

Description

technical field [0001] The invention relates to the field of expansive soil, in particular to a method and a device for measuring the cracking water content of expansive soil. Background technique [0002] Most of the soil encountered in the project is located above the groundwater table and belongs to unsaturated soil. Theoretically speaking, saturated soil has a large permeability coefficient and low strength, while unsaturated soil has a small permeability coefficient and high strength, so most landslides occur in the rainy season. Expansive soil is a special kind of unsaturated soil, which has obvious shrinkage and swelling characteristics, and cracks will be generated in the process of shrinkage due to loss of water. The existence of cracks provides a channel for rainwater to enter the soil, increasing the permeability coefficient of expansive soil. Field tests show that when cracks appear in expansive soil, the in-situ permeability coefficient can reach the level of s...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on expansive soil is mainly focused on its crack characteristics, but there are the following problems: (1) Most of the studies focus on the development of cracks after they are generated, and most of them are qualitative studies, while the quantitative research on cracks and cracking water content There are very few, and there is no set of methods and instruments for measuring the cracking water content of expansive soil; 2) The naked eye observation and camera imaging technology are used to take pictures of soil samples to study the cracks, but the naked eye observation is easily affected by subjective and lacks convincing; The method of reprocessing soil sample photos is too complicated to operate, requires high equipment, and has great interference, which lacks practical engineering significance

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