本文選題：應變 + 差分算法　； 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：邊坡的失穩(wěn)會導致建筑物的破壞,交通設施癱瘓,造成人員傷亡和經(jīng)濟損失,是相當嚴重的全球性自然災害。為了盡可能地減小邊坡失穩(wěn)造成的危害,許多學者開始對邊坡安全性實時監(jiān)測、預報展開研究,取得了很好的成果。伴隨光纖傳感技術(shù)的迅猛發(fā)展,光纖光柵傳感器技術(shù)開始被運用于邊坡的穩(wěn)定性監(jiān)測。本文采用ABAQUS有限元軟件分析了表面粘貼式光纖光柵傳感器應變傳遞率的影響因素,得到了基體層和粘結(jié)層的厚度、彈性模量、泊松比,以及光柵長度對光纖光柵的應變傳遞率的影響。因此,為了消除基體材料和減小粘結(jié)層厚度的影響,本文選取裸光柵來進行分析。通過在測斜管表面合理地布設光纖光柵傳感器來實現(xiàn)溫度的自補償。采用數(shù)值模擬與室內(nèi)試驗對中心差分計算位移的正確性進行了驗證,并結(jié)合外推法提高了位移計算精度;同時對經(jīng)典的位移積分算法進行了改進,發(fā)現(xiàn)分段位移疊加法的計算精度高于經(jīng)典的位移積分算法。根據(jù)極限平衡理論得到了計算邊坡穩(wěn)定系數(shù)的積分求解方法,并且結(jié)合Geo Studio-slope/w和ABAQUS分析了影響邊坡穩(wěn)定性的各種因素,驗證了積分算法的正確性。同時采用數(shù)值模擬對基于位移信息的邊坡穩(wěn)定性計算模型進行了數(shù)值分析。最后以測斜管為載體,結(jié)合位移計算方法,成功地將光纖光柵傳感器應用邊坡模型試驗中,將監(jiān)測到的位移與通過PIV技術(shù)獲取的土體變形進行了對比分析;同時,結(jié)合位移增量目標函數(shù)搜索邊坡的潛在滑裂面位置,進而對邊坡穩(wěn)定性進行了分析,其結(jié)果與Geo Studio-slope/w確定的邊坡安全性情況相當。驗證了基于光纖光柵測斜儀的邊坡健康監(jiān)測及安全性分析算法的可行性。
[Abstract]:Slope instability will lead to the destruction of buildings, traffic facilities paralysis, resulting in casualties and economic losses, is a serious global natural disaster. In order to reduce the damage caused by slope instability as much as possible, many scholars began to study the real-time monitoring and prediction of slope safety, and achieved good results. With the rapid development of fiber optic sensing technology, fiber grating sensor technology has been applied to slope stability monitoring. In this paper, ABAQUS finite element software is used to analyze the factors influencing the strain transfer rate of the surface bonded fiber grating sensor. The thickness, elastic modulus and Poisson's ratio of the matrix layer and the adhesive layer are obtained. And the effect of grating length on the strain transfer rate of fiber grating. Therefore, in order to eliminate the influence of matrix material and reduce the thickness of bonding layer, the bare grating is selected for analysis. The self-compensation of temperature is realized by arranging the fiber Bragg grating sensors reasonably on the surface of the inclined tube. The accuracy of central difference calculation is verified by numerical simulation and laboratory test, and the accuracy of displacement calculation is improved by extrapolation, and the classical displacement integral algorithm is improved. It is found that the accuracy of the piecewise displacement superposition method is higher than that of the classical displacement integral algorithm. According to the limit equilibrium theory, an integral method for calculating the slope stability coefficient is obtained, and various factors affecting the slope stability are analyzed with Geo Studio-slope/w and ABAQUS to verify the correctness of the integral algorithm. At the same time, numerical simulation is used to analyze the slope stability model based on displacement information. Finally, with the inclined tube as the carrier and the displacement calculation method, the measured displacement and the soil deformation obtained by PIV technology are compared and analyzed successfully in the slope model test of fiber Bragg grating sensor. Combined with the displacement increment objective function, the potential slip surface location of the slope is searched, and the slope stability is analyzed. The results are similar to the slope safety determined by Geo Studio-slope/w. The feasibility of slope health monitoring and safety analysis algorithm based on fiber grating inclinometer is verified.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU433

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本文編號：1790108