Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves

Abstract

The invention discloses a quantitative analysis method for evaluating a dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves. The method comprises compacting pretreatment and compacting post-treatment, namely before compacting, performing field Rayleigh surface wave test according to frequency dispersion curve back calculation, so as to obtain a shear wave velocity Vs at different depths before compacting, performing a compacting test on a soil sample at different depths in the field, and finishing an indoor shear wave velocity test, wherein the testing result comprises a relationship Vs-e between the shear wave velocity and a void ratio, and the maximum shear wave velocity Vsmax; and after compacting, performing field Rayleigh surface wave test according to frequency dispersion curve back calculation, so as to obtain a shear wave velocity Vs' at different depths after compacting, and finally, calculating the compaction degree delta according to the parameters, and realizing evaluation on the dynamic compaction reinforcement effect according to the compaction degree delta. Compared with the prior art, the method has the advantages that the quantization parameter, namely the compaction degree delta, of the dynamic compaction reinforcement effect of the foundation is evaluated due to introduction of quantitative analysis, an evaluation effect of the dynamic compaction reinforcement effect can be quantitatively analyzed, and the method is specific and accurate.

Description

technical field [0001] The invention relates to the technical field of foundation treatment in the construction industry, in particular to a quantitative analysis method for the reinforcement effect of dynamic compaction of the foundation. Background technique [0002] As an economical, efficient and wide-ranging ground treatment method, the dynamic compaction method has been widely used in various large-scale infrastructure constructions in recent years. Since the reinforcement effect of dynamic compaction is affected by many factors including rammer, drop distance, tamping point layout, tamping energy, intermittent time, and site soil (refer to literature [1]), "Technical Specifications for Building Foundation Treatment" (refer to literature [ 2]) stipulates that before the construction of dynamic compaction, a field test compaction test must be carried out, and then the reinforcement effect and the applicability of the scheme shall be determined according to the test resu...

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Problems solved by technology

Literature [7] carried out qualitative and quantitative analysis of surface wave detection on the backfilled foundation, but its quantitative analysis is limited to the regional empirical regression formula of 'surface wave velocity-bearing capacity'. According to the regional empirical formula of a certain soil, the measured The Rayleigh surface wave velocity estimates the bearing capacity

Due to the wide variety of soil properties, the calculation of the regional empirical formula can only be limited to certain soils in certain areas, and it is bound to seriously affect the accuracy or even be wrong if it is used outside its limited range.

Especially for the filling soil in the dynamic compaction replacement project, it is impossible to know its empirical formula, and it is difficult to accurately and quantitatively evaluate its reinforcement effect

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