本文關(guān)鍵詞： 泥砂互混吹填土 泥面沉降量 沉降速率 含砂比 密度剖面　出處：《巖土力學(xué)》2017年S1期 　論文類型：期刊論文

【摘要】：開展大尺寸沉降柱試驗(yàn),獲得不同初始含砂比、不同初始含水率的泥砂互混吹填土在自重作用下的泥面沉降量和沉降速率的基本特征,結(jié)合分層抽取法獲得試樣沿高度方向的密度剖面與顆粒分布變化規(guī)律。試驗(yàn)結(jié)果表明,泥砂互混吹填土沉積和顆粒分布規(guī)律與初始含砂比、初始含水率有較大關(guān)系,增加初始含砂比能顯著增加沉降量,且存在一個(gè)合理含砂比,超過合理含砂比后沉降量反而降低,初始含水率越低該種現(xiàn)象越明顯;沉降-時(shí)間曲線基本可以分為3個(gè)階段,其中第Ⅱ階段呈現(xiàn)出比較明顯的非線性特征,隨著初始含水率降低,3個(gè)階段和非線性特征逐漸不明顯;密度剖面呈階梯變化特征,并隨初始含水率和初始含砂比的降低而逐漸過渡到線性特征;初始含砂比和初始含水率均影響著泥砂互混吹填土的顆粒分布模式,初始含砂比和初始含水率越大越有利于粒徑大于0.075 mm的顆粒沉積;初始含砂比越大,底部沉積的粒徑小于0.005 mm顆粒相對(duì)越多,體現(xiàn)出群體沉降特征。
[Abstract]:Large scale settlement column test was carried out to obtain the basic characteristics of mud surface settlement and settlement rate of mud sand with different initial sand content ratio and different initial moisture content under the action of self-weight. The density profile and particle distribution of the sample along the height direction were obtained by using the stratified extraction method. The experimental results show that the sediment and particle distribution law and initial sand content ratio of mud-sand mixed fill soil are obtained. The increase of initial sand content ratio can significantly increase the sedimentation amount, and there exists a reasonable sand content ratio, which decreases after the increase of the initial sand content ratio, and the lower the initial water content is, the more obvious this phenomenon is. The settled-time curve can be divided into three stages, among which the second stage presents obvious nonlinear characteristics, with the decrease of initial moisture content, the three stages and nonlinear characteristics are not obvious. The density profile has the characteristics of step change and the linear character gradually with the decrease of the initial water content and the initial sand content ratio. The initial sand content ratio and initial water content both affect the particle distribution pattern of the mud-sand mixed filling soil. The larger the initial sand content ratio and the initial moisture content, the more favorable the particle size is more than 0.075 mm. The larger the initial sand content ratio is, the more the particle size is less than 0.005 mm at the bottom, which shows the characteristics of group sedimentation.
【作者單位】： 武漢二航路橋特種工程有限責(zé)任公司;中國(guó)科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：湖北省科技支撐計(jì)劃項(xiàng)目(No.2013BGH006) 湖北省自然科學(xué)基金(No.2014CFB370)~~
【分類號(hào)】：TU43
【正文快照】： This work was supported by the Natural Science Foundation of Hubei(2014CFB370)and the Hubei Science and Technology Support Program(2013BGH006).汕頭市東部城市經(jīng)濟(jì)帶市政基礎(chǔ)設(shè)施建設(shè)項(xiàng)目區(qū)域內(nèi)的吹填堆場(chǎng)位于韓江三角洲網(wǎng)河出�？趨^(qū)域,工程建設(shè)范圍為東經(jīng)116°45

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