本文關(guān)鍵詞： 真空預(yù)壓 真空負(fù)壓源 吹填土 固結(jié)沉降 模型試驗(yàn)　出處：《巖土工程學(xué)報(bào)》2016年S1期 　論文類型：期刊論文

【摘要】：考慮真空負(fù)壓沿排水板的衰減分布對(duì)排水板周圍土體固結(jié)特性的影響,開展室內(nèi)模型試驗(yàn)?zāi)M某一深度處預(yù)壓地基排水體中真空負(fù)壓對(duì)其周圍土體徑向固結(jié)的過程。通過分析排水板周邊土體基本物理力學(xué)性質(zhì)、滲透性、壓縮性及土顆分的時(shí)空分布特點(diǎn),研究不同真空負(fù)壓強(qiáng)度對(duì)排水板周圍土體徑向固結(jié)的影響。試驗(yàn)結(jié)果表明隨著真空度沿著排水體的衰減,排水板對(duì)周圍土體的影響范圍逐漸縮小,在軟基深部有大面積的交叉影響區(qū),對(duì)軟基淺部?jī)?yōu)于深部;細(xì)微顆粒在真空負(fù)壓差作用下發(fā)生向著排水板方向運(yùn)移并,使得在排水板周圍細(xì)顆粒含量增大,遠(yuǎn)端細(xì)微顆粒減少;基于真空滲流場(chǎng)理論,結(jié)合顆分試驗(yàn)結(jié)果,分析了真空預(yù)壓過程中細(xì)顆粒運(yùn)移成因,進(jìn)一步解釋了"土樁"形成機(jī)理。
[Abstract]:The influence of the attenuation distribution of vacuum negative pressure along the drainage plate on the consolidation characteristics of soil around the drainage plate is considered. The laboratory model test was carried out to simulate the radial consolidation process of the surrounding soil by vacuum negative pressure in a certain depth of pre-compressed foundation drainage water. The basic physical and mechanical properties and permeability of the soil around the drainage plate were analyzed. The influence of different vacuum negative pressure strength on the radial consolidation of soil around the drainage plate is studied. The experimental results show that the vacuum decreases along the drainage body with the vacuum degree. The influence range of drainage plate on surrounding soil is gradually reduced, there is a large area of cross influence area in the deep of soft foundation, and the shallow part of soft foundation is better than that of deep; The fine particles moved towards the drainage plate under the vacuum negative pressure difference, which increased the fine particle content around the drainage plate and decreased the fine particles at the far end. Based on the theory of vacuum seepage field and the results of particle sub-test, the causes of fine particle migration during vacuum preloading are analyzed, and the formation mechanism of "soil pile" is further explained.
【作者單位】： 交通運(yùn)輸部天津水運(yùn)工程科學(xué)研究所;河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)巖土工程科學(xué)研究所;天津市勘察院;
【基金】：中央高�？蒲袠I(yè)務(wù)費(fèi)項(xiàng)目(B15020060)
【分類號(hào)】：TU411
【正文快照】： 0引言隨著城市發(fā)展建設(shè)土地需求量日益增加,吹填造陸已成為瀕海、河、湖地區(qū)城市發(fā)展,改變土地緊缺現(xiàn)狀的必由之路。目前吹填軟土地基處理多采用真空預(yù)壓法[1-2]。國(guó)內(nèi)外對(duì)于真空預(yù)壓法加固吹填土開展大量的室內(nèi)試驗(yàn)研究其加固機(jī)理。陳環(huán)等[3]通過室內(nèi)模型試驗(yàn)對(duì)負(fù)壓條件下土，

本文編號(hào)：1446438