Experimental Study on Audio Frequency Vibration Grouting in Fine Silty Sand Layer

Abstract:

The reinforcement processing of fine silty sand layer has been the important subject in the engineering field, for it is hard to achieve the desired effect by the traditional grouting method. In view of this situation, the vibrating grouting method is put forward in recent years. However, there are many discrepancies between present vibration grouting simulation tests and the actual working conditions. A test device has been creatively designed, which can satisfy the regulation of freedom vibration frequency and vibration effects is closed to the actual conditions. Comparing the grouting effects of the indoor static pressure grouting test to the audio frequency vibration grouting test, the following conclusions are presented: under the same pressure, the vibration grouting can effectively increase the grouting quantity with better reinforcement effect compared with the static pressure grouting; the appropriate increase of vibration frequency can effectively accelerate the speed of grouting and increase the grouting quantity which has certain practical significance for the project with time limit. However too high frequency is not totally beneficial to the grouting effect, it is crucial to select the optimum grouting frequency according to the actual condition. Under high frequency vibration, the extension of time has less influence to the grouting effect.