A Composite Evaluation Method of Grouting Reinforcement Effect of Existing Subgrade

Abstract

The invention discloses a synthetic evaluation method for an existing roadbed grouting reinforcement effect. According to the method, deflection values obtained before and after existing road grouting reinforcement is conducted are measured, and the density condition of a road roadbed is detected through ground penetrating radar for correction so that measured deflection can more accurately represent the strength of the roadbed, finally, the deflection representative value reduction rates corrected before and after grouting are calculated and compared with a designed value, so that the grouting reinforcement effect is evaluated, and meanwhile an empty region detected through the ground penetrating radar will serve as a key region for grouting. By means of the above manner, the synthetic evaluation method for the existing roadbed grouting reinforcement effect has the following beneficial effects that on one hand, the part, generated due to a road surface factor, in deflection results is eliminated, the obtained deflection can relatively accurately represent the strength of the roadbed, and an evaluation result is more accurate; and on the other hand, the ground penetrating radar and the deflection are used in combination, so that key points are provided in the grouting process, and the reinforcement effect is improved.

Description

Technical field [0001] The invention relates to the technical field of road repair and reinforcement, in particular to a composite evaluation method for the effect of grouting and reinforcement of existing roadbeds. Background technique [0002] The traditional road subgrade grouting reinforcement is mainly based on "excavation type". As a new technology for the existing road subgrade reinforcement, road grouting reinforcement technology has the characteristics of simple construction and obvious reinforcement effect. However, roadbed grouting reinforcement is a concealed project. The methods and evaluation indicators of roadbed field detection in the current specifications are limited to the surface of newly built roadbeds. Therefore, how to evaluate the grouting effect of existing roadbeds is a technical problem that needs to be solved urgently. One difficulty. [0003] Existing testing methods mainly include the following: on-site CBR testing and resilience modulus testing, deep...

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Problems solved by technology

In addition to external factors such as temperature, season, region and road surface shape, vehicle axle load, test speed, and test system deviation, which affect deflection testing, the strength of the subgrade and road surface can most affect the deflection test. related research

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