本文選題：上海黏土　切入點(diǎn)：超固結(jié)度　出處：《上海交通大學(xué)學(xué)報(bào)》2016年03期

【摘要】：對(duì)上海2~6層原狀土樣進(jìn)行了一系列室內(nèi)試驗(yàn),得到了整個(gè)淺層土基本物理參數(shù),并由標(biāo)準(zhǔn)固結(jié)和三軸試驗(yàn)綜合分析了上海淺部土層超固結(jié)度(OCR)的分布規(guī)律.研究認(rèn)為上海淺層黏土天然含水率、初始孔隙比、液塑限、液性指數(shù)與塑性指數(shù)沿深度具有與OCR相反的變化規(guī)律.上海淺部土層的弱結(jié)構(gòu)性導(dǎo)致一維壓縮曲線無(wú)明顯拐點(diǎn),引用Becker能量法得到:2層土的OCR最大,達(dá)到8.0左右,之后急劇減小;3、4和5層土的OCR=1.15~1.40;6層土的OCR2.0.三軸排水試驗(yàn)結(jié)果體現(xiàn)了淺部各土層超固結(jié)性的差異,與標(biāo)準(zhǔn)固結(jié)試驗(yàn)的結(jié)果基本一致.這種固結(jié)試驗(yàn)與三軸試驗(yàn)相結(jié)合的研究方法為進(jìn)一步準(zhǔn)確得到原位土體尤其是弱結(jié)構(gòu)性土的應(yīng)力歷史提供了新的途徑.
[Abstract]:In this paper, a series of laboratory tests were carried out on the undisturbed soil samples of 2 layers in Shanghai, and the basic physical parameters of the whole shallow soil were obtained. Based on standard consolidation and triaxial tests, the distribution of OCRs in Shanghai shallow soil layer is comprehensively analyzed. It is considered that the natural water content, initial void ratio, liquid plastic limit of Shanghai shallow clay are natural. The variation of liquid index and plastic index along the depth is contrary to that of OCR. The weak structure of shallow soil layer in Shanghai leads to no obvious inflection point of one-dimensional compression curve. The maximum OCR of the two-layer soil is obtained by using the Becker energy method, which is about 8.0. The results of triaxial drainage test showed the difference of overconsolidation in shallow soil layers. The results are in good agreement with the results of standard consolidation test, which provides a new way to obtain the stress history of in-situ soil, especially the weakly structured soil, by combining the consolidation test with triaxial test.
【作者單位】： 上海交通大學(xué)土木工程系;濟(jì)南軌道交通集團(tuán)有限公司;
【基金】：國(guó)家自然科學(xué)基金(41372284) 上海市科學(xué)技術(shù)委員會(huì)科研項(xiàng)目(12231200703) 山東省自然科學(xué)基金(ZR2014EEM029) 山東省住房和城鄉(xiāng)建設(shè)廳科技項(xiàng)目計(jì)劃(KY053) 住房和城鄉(xiāng)建設(shè)部科技項(xiàng)目計(jì)劃(2015-K5-004)資助
【分類(lèi)號(hào)】：TU411
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本文編號(hào)：1662505