Method for evaluating roadbed grouting reinforcement effects

Abstract

The invention relates to a method for evaluating roadbed grouting reinforcement effects. The method is characterized by comprising steps of (1), arranging measuring points; (2), testing pre-grouting roadbed dynamic elasticity moduli, in other words, testing the various detection positions and acquiring the pre-grouting roadbed dynamic elasticity moduli of the various detection positions by means of computation; (3), testing and acquiring post-grouting roadbed dynamic elasticity moduli; (4), evaluating the grouting reinforcement effects. Representative values E<0> of the roadbed dynamic elasticity moduli of the various measuring points in evaluation units are computed according to formulas, and representative values E<0><pre-grouting> of the pre-grouting roadbed dynamic elasticity moduli and representative value E<0><post-grouting> of the post-grouting roadbed dynamic elasticity moduli are computed, so that increase rates E<0><increase rate> of the roadbed dynamic elasticity moduli can be acquired by means of computation. The method has the advantages that the roadbed dynamic elasticity moduli can be quickly measured on the basis of a falling-weight deflectometer process and are feature parameters which reflect the soil strength of roadbeds, the method is nondestructive, speedy, simple and effective, and accordingly huge engineering loss due to roadbed grouting construction quality defects can be prevented.

Description

technical field [0001] The invention belongs to the technical field of road surface construction, and in particular relates to a roadbed grouting reinforcement effect evaluation method. Background technique [0002] Roadbed grouting reinforcement technology is a new method of roadbed reinforcement, which avoids the "opening and breaking" type of construction. The construction is simple and the reinforcement effect is obvious. It is very important for making full use of the strength of old roads, saving investment, and reducing environmental pollution. economic and social significance. However, since subgrade grouting reinforcement is a hidden project, if quality problems occur, the reinforcement effect will not be achieved, resulting in insufficient subgrade strength, which will lead to early damage to the subgrade and pavement, resulting in huge losses such as rework. In order to ensure the quality of the project and the smooth completion of the project, and to avoid waste...

AI Technical Summary

Problems solved by technology

Among them, the first and second detection methods are non-destructive testing methods, but their detection indicators can only be analyzed qualitatively, and cannot be objectively evaluated from a quantitative perspective.

The third detection method reflects the overall strength of the subgrade and pavement within the depth of the load below the road surface, and cannot evaluate the strength of the subgrade

The detection index of the fourth detection method can be converted into the elastic modulus of subgrade soil, but its detection efficiency is low, and it is greatly dispersed due to the uneven distribution of slurry stones, so it is impossible to make a correct evaluation

The fifth detection method can obtain the physical and mechanical properties of the soil after reinforcement, but it causes great damage to the road surface, and the detection efficiency is low, the cost is expensive, and it cannot be used for large-scale detection.

The results of the detection method in (6) are suitable for the mesoscopic research of roadbed grouting reinforcement soil, and the cost is expensive, so it cannot be used as an actual engineering detection and evaluation method

Images