Application of engineering geophysical exploration technology to engineering investigation and foundation detection in reclamation areas

Abstract

Application of engineering geophysical exploration technology to engineering investigation and foundation detection in reclamation areas is characterized in that the technology can realize geophysical exploration of super-thick backfill layers and basement rock depth in reclamation areas and backfill dynamic compaction detection. The specific contents are as follows: achieving geophysical exploration of super-thick backfill layers and basement rock depth in reclamation areas; adopting a rig sinker bar for excitation to increase the seismic source energy, wherein the sinker bar is 400-500 Kg in weight and 2-3 m in drop distance and is used for prospecting data of 15-40 m depth; achieving backfill dynamic compaction detection; (1) adopting a 200 Kg hammer for dynamic sounding to effectively penetrate 12 m gravelly soil fill stratum so as to visually obtain design parameters of coarse-grained composite soil plain fill before and after ground treatment; (2) combining the monitoring method and the multi-channel instantaneous surface wave method to effectively detect the dynamic compaction effect and accurately and quantitatively evaluate the influence depth, range and strength parameters of dynamic compaction.

Description

technical field [0001] The invention relates to the application of engineering geophysical prospecting technology in engineering survey and foundation detection of reclamation area. The technology can realize geophysical prospecting survey of extremely thick backfill layer and buried depth of bedrock in sea reclamation area and detection of backfill soil dynamic compaction treatment. Background technique [0002] In artificial seismic exploration, after the source is excited, a variety of seismic waves are propagated in the medium around the excitation point, such as surface waves and body waves (direct waves, refracted waves, reflected waves) and their converted waves. In the past, direct waves, refracted waves, and reflected waves in seismic waves were often used for surveys, and surface waves were suppressed as harmful waves. The above methods have low survey accuracy and can only be qualitatively analyzed, not quantitatively explained. After several years of experimental...

AI Technical Summary

Problems solved by technology

There are problems in the conventional detection method in the dynamic compaction detection: ①The detection depth is very shallow with a load test, only about 2 meters, which cannot reflect the depth affected by the dynamic compaction

②Using heavy-duty (63.5kg) or super-heavy-duty power penetrating probe (120kg), neither can penetrate such a thick gravel filling layer. Even if it passes through occasionally, it is difficult to reflect the effect of dynamic compaction due to the rebound of the gravel

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