Method for in-situ detecting quality of deep-cement-mixed soil based on mixing uniformity

Abstract

A method for on-site detection of the quality of deep-layer cement mixed soil based on mixing uniformity in the field of construction engineering technology, the steps are as follows: 1) After the cement and soft soil are mixed on site, the soft state before the mixed soil is hardened is taken out with a soil catcher. Soil, soil sampling points are arranged in a radial concentric radial arrangement on the plane, and the soil sampling depth is the depth of the mixing pile; 2) Measure the pH value of the mixed soil taken out on site; 3) Make a distribution map of the pH value , measure the number of points with a pH value less than 10 and greater than 10; 4) Calculate the mixing uniformity index, and the mixing uniformity index = (number of points with a pH value greater than 10 / total test points) × 100%; 5) According to the pH value and the mixing The strength relationship of the soil determines the average strength of the mixed soil, and the average strength of the mixed soil is: mixing uniformity index × standard strength value. The invention evaluates the homogeneity of the mixed soil through a chemical test method of measuring the PH value of the mixed soil on site, and then evaluates the overall quality of the cement mixed soil, and is applicable to all projects that adopt cement and soft soil mixed treatment for reinforcement construction.

Description

technical field [0001] The invention relates to a method for detecting construction quality in the technical field of construction engineering, in particular to an on-site method for detecting the quality of deep cement mixed soil based on mixing uniformity. Background technique [0002] The soft soil cement mixing treatment technology with deep mixing treatment is widely used in the construction of industrial and civil buildings, subways, municipalities, water conservancy, mines, port channels and offshore facilities. The key to the success of deep cement and clay mixing technology is the uniformity of cement and soft clay mixing. If the mixing uniformity is good, the quality of the cement mixed treatment foundation will be good; if the mixing uniformity is poor, the quality of the treatment foundation will be poor. Stirring mixes unevenly, making the field strength of the mixed soil very discrete. As long as there is a slight deviation in the strength evaluation, quality...

AI Technical Summary

Problems solved by technology

However, on-site drilling samples are often taken from the center of the reinforced body and several other typical cross-section positions. The measured strength is only partial and cannot objectively and accurately reflect the overall mixing effect of cement and soil.

Also, the method does not evaluate the homogeneity of the stirred mixture

In addition, coring is often carried out after the mixed soil hardens, which is not only costly, but also requires high equipment

These methods can only take partial samples for physical and mechanical property tests, which are time-consuming, labor-intensive and economical. In the end, they cannot make an objective and effective evaluation of the overall quality of the stirred mixture.

Images