本文關(guān)鍵詞：輕型擋土墻系統(tǒng)參數(shù)識別及損傷診斷研究　出處：《重慶大學(xué)》2013年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輕型擋土墻 模態(tài)分析 損傷診斷 參數(shù)識別 平均曲率 整體穩(wěn)定性

【摘要】：支擋結(jié)構(gòu)是巖土工程中的一個重要組成部分，具有極其重要的地位。如果能夠及時有效地對支擋結(jié)構(gòu)進(jìn)行健康監(jiān)測，就可以對支擋結(jié)構(gòu)的整體穩(wěn)定性進(jìn)行評估，進(jìn)而可以避免人民群眾的生命財產(chǎn)及國家的巨額基礎(chǔ)設(shè)施蒙受巨大的損失。因此如何對支擋結(jié)構(gòu)進(jìn)行健康診斷，以確定支擋結(jié)構(gòu)是否存在損傷，進(jìn)而判別損傷位置、損傷程度和損傷變化趨勢，是巖土支擋結(jié)構(gòu)健康監(jiān)測與安全評估系統(tǒng)的最主要問題。為此，本文在國家自然基金科學(xué)儀器基礎(chǔ)研究項目“巖土支擋結(jié)構(gòu)健康診斷儀的研制”(項目批準(zhǔn)號：51027004)、教育部長江學(xué)者和創(chuàng)新團(tuán)隊發(fā)展計劃項目“山區(qū)巖土工程”（項目批準(zhǔn)號：IRT1045）的資助下對輕型擋土墻系統(tǒng)健康診斷問題展開了相關(guān)研究�；诶碚摲治�、數(shù)值模擬和現(xiàn)場試驗，對擋土墻系統(tǒng)的土體附加參數(shù)識別、動力指紋損傷識別法、人工智能損傷識別法和整體穩(wěn)定性評價等問題進(jìn)行了全面深入的研究，論文的主要研究工作如下： ①建立了輕型擋土墻系統(tǒng)動力響應(yīng)的三維有限元數(shù)值模型，運用整體正交多項式法和特征系統(tǒng)實現(xiàn)法對擋土墻系統(tǒng)的模態(tài)特性進(jìn)行研究。為了研究損傷對擋土墻系統(tǒng)模態(tài)特性的影響規(guī)律，詳細(xì)分析了土體、擋墻的損傷程度、損傷面積和損傷位置對擋土墻系統(tǒng)的模態(tài)特性和幅值譜曲線的影響。 ②提出了懸臂擋土墻系統(tǒng)的簡化動測模型，對土體附加參數(shù)的識別方法進(jìn)行探討。在模態(tài)參數(shù)識別的基礎(chǔ)上，采用有限元優(yōu)化設(shè)計方法識別土體的附加參數(shù)，對不同的組合優(yōu)化方法、不同的目標(biāo)函數(shù)的識別結(jié)果進(jìn)行評價。并分析了土體附加阻尼對擋土墻系統(tǒng)簡化動測模型的模態(tài)特性和動力響應(yīng)的影響。 ③引入微分幾何中的平均曲率概念，推導(dǎo)了適用于輕型擋土墻結(jié)構(gòu)的損傷識別新指標(biāo)：模態(tài)平均曲率差MMCD和柔度差平均曲率FDMC。以懸臂擋土墻為算例，，通過與其他三種損傷識別指標(biāo)(頻率變化率RF、振型變化率RD、高斯曲率模態(tài)差MGCD)進(jìn)行對比分析，驗證新指標(biāo)對損傷的敏感性和有效性。損傷識別新指標(biāo)能夠準(zhǔn)確的識別出擋土墻的損傷位置，繼而評估擋土墻的損傷程度。 ④采用改進(jìn)多種群遺傳算法，結(jié)合擋土墻系統(tǒng)損傷時的特征方程，構(gòu)造了能有效地同時識別出擋土墻系統(tǒng)損傷位置和損傷程度的方法：整體損傷識別法和分區(qū)損傷識別法。通過懸臂擋土墻不同損傷工況的識別結(jié)果，對兩種識別方法的適用性、識別精度、計算效率和有效性進(jìn)行了探討。 ⑤對擋土墻系統(tǒng)整體穩(wěn)定性“實時”評價方法進(jìn)行研究，將擋土墻整體穩(wěn)定性分為3個等級：穩(wěn)定、基本穩(wěn)定和不穩(wěn)定。在擋土墻系統(tǒng)模態(tài)分析基礎(chǔ)上，將土體等效成一系列彈簧來模擬，土壓力統(tǒng)一表示為靜止土壓力和土壓力增量之和，并假定土壓力增量等于土體的地基反力系數(shù)和墻體位移的乘積，結(jié)合墻土共同變形，進(jìn)行迭代計算得到土壓力的分布形式。通過對庫倫土壓力理論、靜止土壓力理論和試驗結(jié)果進(jìn)行對比分析，驗證所提出的土壓力計算方法的可行性，從而進(jìn)一步確定擋土墻系統(tǒng)的整體穩(wěn)定性。
[Abstract]:The retaining structure is an important part in geotechnical engineering, is very important. If we can promptly and effectively carry out health monitoring of retaining structure, can evaluate the overall safety of retaining structure, which can avoid the huge infrastructure and national life and property of the masses of the people suffered huge losses so how to retaining structure health diagnosis, to determine the retaining structure is damage, and then determine the damage location, damage degree and damage trend of rock and soil retaining structure health monitoring and safety assessment system of the main problems. Therefore, based on the National Natural Science Foundation Project "basic research of geotechnical instruments the retaining structure of the instrument of health diagnosis development" (Grant No. 51027004), the Ministry of education program for Changjiang Scholars and innovative research team project "in geotechnical engineering" (project approval Number: IRT1045) under the support of retaining wall system health diagnosis related research has been carried out. Based on the theoretical analysis, numerical simulation and field test of soil additional parameter identification of the retaining wall system, dynamic fingerprint damage identification method, artificial intelligence damage identification method and whole stability evaluation are studied the main research work of this paper is as follows:
The establishment of three-dimensional finite element light retaining wall system dynamic response numerical model, using global orthogonal polynomial method and eigensystem realization method was used to study the modal characteristics of the retaining wall system. In order to study the influence of gear damage modal characteristics of wall system, a detailed analysis of the soil, the damage degree of the damaged area and the influence of the retaining wall the damage location on the modal characteristics and amplitude spectrum curve of retaining wall system.
The simplified model of dynamic measuring system of cantilever retaining wall, identification method on soil additional parameters. Based on modal parameter identification, additional parameters by using the finite element optimization design method for identification of soil, combination of different optimization methods, identification of different target function results were evaluated and analyzed the soil. The additional damping on the dynamic measurement model of the simplified modal characteristics and dynamic response of retaining wall system.
The concept of mean curvature in differential geometry, which is used to light the new block wall structure damage identification index: the average modal curvature difference MMCD and flexibility difference mean curvature FDMC. in a cantilever retaining wall for example, with the other three kinds of damage identification index (frequency change rate RF, modalchange rate RD, Gauss modal curvature difference MGCD) were analyzed to validate the new index sensitivity to damage and effectiveness. The new damage detection index can accurately identify the damage location of the retaining wall, and then evaluate the damage degree of the retaining wall.
The improved multi population genetic algorithm, combined with the characteristic equation of retaining wall system damage, the structure can effectively identify the retaining wall system and method of damage location and damage degree of overall damage identification method and damage identification method. Different partition wall damage condition by retaining cantilever recognition results, the applicability of two a recognition method of recognition accuracy, computational efficiency and effectiveness are discussed.
The research on the method of overall stability of retaining wall system real-time evaluation, the whole stability of earth retaining wall is divided into 3 levels: basic stability, stable and unstable. The retaining wall system based on the modal analysis, the soil is equivalent to a series of springs to simulate the soil pressure, expressed as the static earth pressure and soil the increment of the pressure, and assume that the product is equal to the earth pressure increment coefficient of subgrade reaction and wall displacement of soil, combined with the common wall soil deformation, distribution of earth pressure is obtained by iterative calculation. Based on the theory of Kulun earth pressure, static earth pressure theory and the test results were analyzed and verified the feasibility of the calculation method of earth pressure put forward, so as to further determine the overall stability of retaining wall system.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU476.4

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