本文選題：光纖 + 布拉格光柵��； 參考：《巖土工程學(xué)報(bào)》2017年07期

【摘要】：小應(yīng)變下的土體模量的變化對(duì)基坑周圍既有建筑物的變形和路基沉降分析具有重要意義。土體模量會(huì)隨土體的應(yīng)變呈非線性變化,特別是應(yīng)變范圍為10~(-5)~10~(-3),土體模量隨應(yīng)變的增加顯著降低。由于土體應(yīng)變的變化范圍廣,傳統(tǒng)的單一測(cè)量?jī)x器無法連續(xù)量測(cè)土體從微小應(yīng)變到小應(yīng)變的模量變化情況。通常測(cè)量土體小應(yīng)變模量的方法有彎曲元和局部位移計(jì)方法。彎曲元方法能有效測(cè)量土體微小應(yīng)變的模量,但不能得到土體模量在小應(yīng)變情況下變化規(guī)律,因?yàn)閺澢椒o法得到和控制土體的應(yīng)變。設(shè)計(jì)了基于布拉格光纖光柵傳感技術(shù)的局部位移計(jì)。通過設(shè)計(jì)和標(biāo)定試驗(yàn),成功將布拉格光纖光柵局部位移計(jì)應(yīng)用于改裝的三軸試驗(yàn)儀器中。為進(jìn)一步的對(duì)比分析,在改進(jìn)的三軸試驗(yàn)裝置中安裝了彎曲元試驗(yàn)系統(tǒng)�；诟难b的三軸試驗(yàn)儀器,進(jìn)行了不同圍壓下的固結(jié)不排水試驗(yàn),得到了土體從微小應(yīng)變到小應(yīng)變下模量的變化曲線。試驗(yàn)結(jié)果驗(yàn)證了光纖光柵局部位移計(jì)能有效的測(cè)量土體在小應(yīng)變情況下的模量非線性變化特征。
[Abstract]:The variation of soil modulus under small strain is of great significance to the analysis of deformation and subgrade settlement of existing buildings around the foundation pit. The modulus of the soil is nonlinear with the strain of the soil, especially the strain range of 10 ~ (-5) ~ 10 ~ (-3), and the modulus of the soil decreases significantly with the increase of the strain. Because of the wide range of soil strain, the traditional single measuring instrument can not continuously measure the variation of soil modulus from small strain to small strain. The methods of measuring the small strain modulus of soil are bending element and local displacement meter. The bending element method can effectively measure the modulus of small strain of soil, but it can not get the variation rule of soil modulus in the case of small strain, because the bending element method can not obtain and control the strain of soil. A local displacement meter based on fiber Bragg grating sensing technology is designed. Through the design and calibration test, the fiber Bragg grating local displacement meter is successfully applied to the modified triaxial test instrument. For further comparison and analysis, the bending element test system was installed in the improved triaxial test device. Based on the modified triaxial test instrument, consolidation undrained tests under different confining pressures were carried out, and the curves of soil modulus changing from small strain to small strain were obtained. The experimental results show that the fiber grating local displacement meter can effectively measure the nonlinear variation characteristics of the modulus of soil under small strain.
【作者單位】： 華中科技大學(xué)土木工程與力學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51508215) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2017KFYXJJ138)
【分類號(hào)】：TP212;TU198

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本文編號(hào)：1868347