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The Ground Surface Settlement Curve Reconstruction Based On The Compression Sensing

Posted on:2013-11-21Degree:MasterType:Thesis
Country:ChinaCandidate:W K SuFull Text:PDF
GTID:2230330392456822Subject:Control Engineering
Abstract/Summary:PDF Full Text Request
With the urban subway construction to rise unceasingly,the negative effects of the surface subsidence caused by tunnel excavation have been showing.The experts and scholars from domestic and foreign countries are paying more and more attention to it.Yet, with the reasons of various factors,such as the subway tunnel construction environment and the geological conditions and so on,the ground surface settlement data after sampling is irregular and less integrity,which influences the reconstruction effect of the surface settlement curve.If we use the traditional reconstruction methods, the sampling rate is higher and it will take up a lot of memory and storage resource, and leads to a larger economic cost.Based on the newly developed compression sensing theory, this paper makes full use of the sparse feature of the surface subsidence data in sparse transform domain and adopts more flexible sampling and compressing strategy,which not only reduces the data sampling rate and economic cost,also gets ideal ground surface settlement curve reconstruction effect.According to the compression sensing theory developed rapidly in recent years,we can get ideal restored effect with the lower frequency than the traditional shannon/Nyquist sampling rate and the incomplete surface sampling data.Based on this theory, this paper mainly studies the surface subsidence curve reconstruction in DCT transform and in wavelet transform. The latter mainly studies the surface settlement curve reconstruction based on wavelet transformation,including the wavelet、wavelet decomposition level、 the design of the matrix、 recovery algorithm and noise elimination and so on.Finally, in chapter5,this paper gets a Summary for the full text,and then lists the innovation points and the subsequent feasibility research directions.
Keywords/Search Tags:Ground surface settlement, Compression sensing, DCT transform, Wavelet transform, Curve reconstruction
PDF Full Text Request
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