Compaction quality control method of rockfill dam based on soil resonance frequency

Abstract

The invention discloses a rock-fill dam compaction quality control method based on soil body resonance frequency. The method comprises the following steps of receiving a soil body resonance signal byan acceleration sensor, wherein the soil body resonance signal is generated when a reflected P wave is propagated back to a vibration wheel; filtering the received soil body resonance signal; performing fast Fourier transform on a filtered frequency range to obtain a frequency spectrogram of an acceleration time-range signal, wherein the fundamental frequency of the frequency spectrogram is the soil body resonance frequency fp; calculating the reflected P wave velocity Vp by using a formula Vp=4H.fp; and establishing a regression relationship f(Vp)-rhod between the obtained soil body resonancefrequency fp and the reflected P wave velocity Vp and the soil body dry density rhod obtained through test pit detection after on-site rolling, according to the dry density rhodc required by each soil body to reach a compaction standard, calculating to obtain control values Vpc and Nc of the Vp and the vibration rolling pass number N, and applying the control values to the field control. According to the rock-fill dam compaction quality control method based on the soil body resonance frequency provided by the invention, full-bin surface automatic real-time detection is carried out on the compaction quality of a rockfill dam, the detection speed is high, and the detection result is accurate.

Description

technical field [0001] The invention relates to the field of rockfill dam compaction quality detection and control, in particular to a rockfill dam compaction quality control method based on soil resonance frequency. Background technique [0002] At present, the conventional detection method for the compaction quality of coarse-grained materials in rockfill dams is mainly the test pit detection method, which has defects such as random sampling, processing lag, and complicated operation. 1) Random sampling. The coarse-grained material filling area of ​​rockfill dams generally has uneven filling. Conventional sampling methods can only obtain the inspection results of sampling points, and it is difficult to reflect the overall uniformity of dam surface compaction. 2) Processing lag. Routine detection methods are often carried out after the rolling operation is completed, which belongs to result control. If problems are found, they need to be reworked and cannot be dealt with ...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a method for controlling the compaction quality of rockfill dams based on the resonance frequency of soil. Automatic real-time detection of the warehouse surface, no longer need to select detection points in the rolling area, and solve the problems of uneven sampling, untimely processing and complicated detection process in traditional methods

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