發(fā)布時(shí)間：2018-03-30 19:06

  本文選題：土層參數(shù)　切入點(diǎn)：反分析　出處：《昆明理工大學(xué)》2015年碩士論文

【摘要】：土層參數(shù)是巖土工程設(shè)計(jì)過(guò)程中的重要指標(biāo),一般通過(guò)室內(nèi)試驗(yàn)獲得,由于土層的自然變異性、試驗(yàn)條件、試驗(yàn)方法等方面的原因,試驗(yàn)結(jié)果往往具有離散性,與真實(shí)值有一定差異。再者,如果工程施工方法不同,即使是同一種土體,其土層參數(shù)也會(huì)存在差異。因此,需要采用適當(dāng)?shù)姆椒ê侠淼拇_定土層參數(shù)。結(jié)合已有監(jiān)測(cè)數(shù)據(jù),通過(guò)反分析手段獲得土層參數(shù),然后用反分析得到的參數(shù)進(jìn)行正分析,從而可以及時(shí)更新數(shù)據(jù)、指導(dǎo)后期設(shè)計(jì)施工或指導(dǎo)類(lèi)似工程設(shè)計(jì)。本文從反分析方法及其應(yīng)用方面展開(kāi)研究工作,如下：(1)針對(duì)目前反分析方法存在的問(wèn)題,提出了一種基于非參數(shù)回歸的土層參數(shù)反分析算法。將不同工況的同一實(shí)測(cè)目標(biāo)作為約束條件,考慮實(shí)測(cè)目標(biāo)量測(cè)的誤差,選定容差ε,從而得到目標(biāo)實(shí)測(cè)值的容差范圍,然后確定待反分析土層參數(shù)的初始范圍,結(jié)合均勻試驗(yàn)和非參數(shù)回歸方法建立土層參數(shù)與實(shí)測(cè)目標(biāo)之間的響應(yīng)面,按照工況枚舉處大量參數(shù)樣本,利用響應(yīng)面插值得到大量目標(biāo)計(jì)算值,逐一對(duì)比目標(biāo)的計(jì)算值和實(shí)測(cè)值,篩分出在容差范圍內(nèi)與目標(biāo)實(shí)測(cè)值接近的目標(biāo)計(jì)算值所對(duì)應(yīng)的土層參數(shù)數(shù)據(jù)樣本,并把數(shù)據(jù)樣本的統(tǒng)計(jì)范圍作為目標(biāo)實(shí)測(cè)值在一定容差范圍內(nèi)對(duì)應(yīng)的土層參數(shù)實(shí)際取值區(qū)間。(2)反分析算法在基坑工程中的應(yīng)用。選擇鋼支撐力和樁身水平位移作為實(shí)測(cè)目標(biāo),利用反分析算法對(duì)基坑剖面支護(hù)樁所在深度范圍內(nèi)土層的抗剪強(qiáng)度指標(biāo)c、φ值進(jìn)行反分析,得到土層參數(shù)的取值區(qū)間,并進(jìn)行了驗(yàn)證。(3)反分析算法在盾構(gòu)隧道工程中的應(yīng)用。選擇地面沉降作為實(shí)測(cè)目標(biāo),利用反分析算法對(duì)盾構(gòu)隧道開(kāi)挖影響范圍內(nèi)土層的抗剪強(qiáng)度指標(biāo)c、φ值進(jìn)行反分析,得到土層參數(shù)的取值區(qū)間,并利用反分析結(jié)果預(yù)測(cè)臨近將要開(kāi)挖斷面的地面沉降,與實(shí)測(cè)值作對(duì)比,結(jié)果較為接近。通過(guò)兩個(gè)工程實(shí)例的應(yīng)用,表明了本文提出的反分析算法是可行的,并且是一種通用算法,該算法考慮了目標(biāo)實(shí)測(cè)值量測(cè)的誤差和施工工況的影響,可以選擇多個(gè)實(shí)測(cè)目標(biāo)作為約束條件綜合分析多個(gè)參數(shù),提高了分析效率,可以用于指導(dǎo)設(shè)計(jì)施工,為巖土工程中土層參數(shù)反分析提供了一條有效途徑。
[Abstract]:Soil layer parameter is an important index in the process of geotechnical engineering design. Generally, it is obtained by indoor test. Due to the natural variability of soil layer, test conditions, test method and other reasons, the test results are often discrete. Moreover, if the engineering construction method is different, even if the soil is the same soil, the soil layer parameters will be different. Therefore, it is necessary to adopt appropriate method to determine the soil layer parameters reasonably, combined with the existing monitoring data, The parameters of soil layer are obtained by means of back analysis, and then the parameters obtained by back analysis are used to carry out positive analysis, so that the data can be updated in time. To guide the design and construction of later stage or to guide similar engineering design. In this paper, the research work is carried out from the aspects of back-analysis method and its application, as follows: (1) in view of the problems existing in the present back-analysis method, A non-parametric regression based back-analysis algorithm for soil layer parameters is proposed. Taking the same measured target under different working conditions as the constraint condition and considering the error of the measured target measurement, the tolerance 蔚 is selected, and the tolerance range of the target measured value is obtained. Then the initial range of soil parameters is determined, and the response surface between soil parameters and measured targets is established by combining uniform test and non-parametric regression method, and a large number of parameter samples are obtained according to the enumeration of working conditions. A large number of target calculated values are obtained by using response surface interpolation. The calculated and measured values of the target are compared one by one, and the soil layer parameter data samples corresponding to the calculated value of the target in the tolerance range are sifted out. The statistical range of the data sample is taken as the range of actual values of soil parameters in a certain tolerance range. The application of inverse analysis algorithm in foundation pit engineering is discussed. The steel bearing force and the horizontal displacement of pile body are chosen as the measured targets. By using the inverse analysis algorithm, the shear strength indexes c and 蠁 of the soil layer in the depth range of the foundation pit profile supporting pile are back analyzed, and the interval of the soil layer parameters is obtained. The application of the back-analysis algorithm in shield tunnel engineering is verified. The anti-analysis algorithm is used to analyze the shear strength index (c, 蠁) of the soil layer in the influence area of shield tunnel excavation by selecting the ground settlement as the measured target. The value interval of soil parameters is obtained, and the ground subsidence near the excavation section is predicted by using the result of back analysis. The results are close to those of the measured values. Through the application of two engineering examples, The results show that the proposed inverse analysis algorithm is feasible, and it is a general algorithm, which takes into account the error of target measured value and the effect of construction condition. A number of measured targets can be selected as constraint conditions for comprehensive analysis of multiple parameters, which improves the efficiency of analysis, can be used to guide design and construction, and provides an effective way for back analysis of soil parameters in geotechnical engineering.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU43

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 高瑋,鄭穎人;巖土工程非確定性反分析研究動(dòng)態(tài)[J];地下空間;2000年02期

2 潘國(guó)榮;;位移測(cè)量反演分析的解算模型與應(yīng)用[J];大地測(cè)量與地球動(dòng)力學(xué);2006年02期

3 劉維倩，黃光遠(yuǎn)，穆永科，孟昭波，，王中偉，卞鳳生;巖土工程中的位移反分析法[J];計(jì)算結(jié)構(gòu)力學(xué)及其應(yīng)用;1995年01期

4 楊林德 ,黃偉 ,王聿;初始地應(yīng)力位移反分析計(jì)算的有限單元法[J];同濟(jì)大學(xué)學(xué)報(bào);1985年04期

5 朱合華,丁文其,李曉軍;盾構(gòu)隧道施工力學(xué)性態(tài)模擬及工程應(yīng)用[J];土木工程學(xué)報(bào);2000年03期

相關(guān)碩士學(xué)位論文 前3條

1 馮俊福;杭州地區(qū)地基土m值的反演分析[D];浙江大學(xué);2004年

2 金暢;蒙特卡洛方法中隨機(jī)數(shù)發(fā)生器和隨機(jī)抽樣方法的研究[D];大連理工大學(xué);2006年

3 胡鳴;結(jié)構(gòu)可靠度計(jì)算方法研究[D];華南理工大學(xué);2010年

本文編號(hào)：1687234