【摘要】：深厚覆蓋層土體原位結(jié)構(gòu)性強(qiáng),原狀樣取樣困難,且由于粒徑、級(jí)配的改變,室內(nèi)重塑樣試驗(yàn)確定的力學(xué)參數(shù)不能反映原位土體的實(shí)際性質(zhì),如何準(zhǔn)確確定深厚覆蓋層土體的力學(xué)參數(shù)是工程建設(shè)中的難題。本文聯(lián)合室內(nèi)和現(xiàn)場(chǎng)試驗(yàn),研究了考慮原位結(jié)構(gòu)效應(yīng)確定深厚覆蓋層砂土動(dòng)力變形特性參數(shù)的方法。研究結(jié)果表明,可以通過(guò)聯(lián)合現(xiàn)場(chǎng)波速試驗(yàn)和室內(nèi)共振柱試驗(yàn)綜合確定的最大動(dòng)剪模量Gmax反映深厚覆蓋層砂土動(dòng)力變形特性的原位結(jié)構(gòu)效應(yīng);基于室內(nèi)共振柱試驗(yàn)確定的砂土歸一化G/Gmax-γ/γr曲線和λ-γγr曲線受顆粒大小、級(jí)配和結(jié)構(gòu)性的影響很小,用其可以分別較為接近地表征原位土體動(dòng)剪模量G隨動(dòng)剪應(yīng)變?chǔ)玫乃p關(guān)系及阻尼比λ隨動(dòng)剪應(yīng)變?chǔ)玫脑鲩L(zhǎng)關(guān)系。聯(lián)合現(xiàn)場(chǎng)剪切波速和室內(nèi)重塑樣動(dòng)力變形特性試驗(yàn)成果,能夠較好地考慮原位結(jié)構(gòu)效應(yīng)確定深厚覆蓋層土體的動(dòng)力變形特性參數(shù)。
[Abstract]:The in situ structure of deep overburden soil is strong, and the sampling of original sample is difficult, and due to the change of particle size and gradation, the mechanical parameters determined by laboratory remodeling sample test can not reflect the actual properties of in situ soil. How to accurately determine the mechanical parameters of deep overburden soil is a difficult problem in engineering construction. Based on laboratory and field tests, the method of determining the dynamic deformation characteristic parameters of deep overburden sand considering in situ structural effect is studied in this paper. The results show that the maximum dynamic shear modulus Gmax, which can be determined by combined field wave velocity test and laboratory resonance column test, can reflect the in situ structural effect of dynamic deformation characteristics of deep overburden sand. Based on the laboratory resonance column test, the normalized G 鈮，

本文編號(hào)：2522977