A test device and evaluation method for static water stability of cohesive soil aggregates

Abstract

The invention relates to a testing device and an evaluation method for static water stability of cohesive soil aggregates. The testing device comprises a glass bathtub; a temperature sensor; a resistance type heater; a temperature controller; a separate plate; an accommodating zone; a water inlet switch; a water inlet pipe; a water inlet storage container; a water outlet switch; a water outlet pipe; a constant temperature water bath device composed of a micro high temperature resistant water pump and a water outlet storage container; a container lift control system composed of a support frame, a support frame pedestal and a lifter; a weight monitoring device composed of a hanging electronic scale and a telescopic hook; and a test container composed of a suspension loop and a stainless steel annular sieve. The evaluation method comprises following steps: assembling of the testing device; setting of testing temperature; delivering of soil samples; performing of testing experiment; evaluating of the stability, and cleaning of the test container. Testing precision on the static water stability of the cohesive soil aggregates is high; the testing device is convenient to assemble, and simple to operate; cost is low; and evaluation on the stability of the cohesive soil aggregates can be performed quickly and effectively.

Description

technical field [0001] The invention belongs to the technical field of soil engineering, in particular to a test device and an evaluation method for static water stability of cohesive soil aggregates. Background technique [0002] The water stability of aggregates is one of the important performance indicators of cohesive soils. In the field of soil engineering, the water stability of cohesive soil aggregates often directly affects the stability of the entire soil engineering, especially slope engineering such as slopes, embankments, embankments, etc. How to use reinforcement materials to improve cohesive soil at home and abroad To solve the problem has become a research hotspot. In soil reinforcement engineering, the failure mechanisms of cohesive soil aggregates in contact with water mainly include disintegration, differential expansion, physical-chemical dispersion, etc. Therefore, it is essential to test and evaluate the water stability of cohesive soil aggregates befor...

AI Technical Summary

Problems solved by technology

During the operation of the wet sieving method, the position of the sieve in the water and the direction of movement of the sieve are difficult to keep consistent. At the same time, the vibration frequency, amplitude and time of the wet sieve selected by different users are also quite different. When evaluating the water stability of aggregates, it brings many difficulties to choose the appropriate oscillation frequency, amplitude and time for the object to be evaluated.

Therefore, when using the wet sieving method to evaluate the water stability of a large number of cohesive soil aggregates with different degrees of improvement, it not only requires a large amount of work, but also some results cannot reflect the small differences in the water stability of the aggregates, resulting in Evaluation results are distorted

For example, Chinese patent application 201210036689.4 discloses a "device and method for measuring soil water-stable aggregates", although it has the ability to simultaneously measure four samples and simultaneously obtain water-stable aggregates of different particle sizes from the same sample advantages, but there are still the following obvious deficiencies: First, this method drys and weighs the remaining sample weight again during the test process, which not only causes large errors in the test results, but also greatly increases the workload; second, it does not consider the temperature. The impact on the water stability of the aggregates leads to the distortion of the test results caused by temperature differences; the third is that the vibration test method cannot realize the small difference evaluation of the water stability of the aggregates

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