本文關(guān)鍵詞： 滲濾效應(yīng) 水泥漿 鋒面 流速 壓力　出處：《中國(guó)科學(xué):技術(shù)科學(xué)》2017年11期 　論文類型：期刊論文

【摘要】：基于滲流連續(xù)性方程、Darcy滲流定律、質(zhì)量守恒方程、線性濾過(guò)定律及壓力降方程,建立了水泥漿鋒面擴(kuò)散理論模型,分析了滲濾效應(yīng)下水泥顆粒的運(yùn)移濾出機(jī)制和漿液鋒面的擴(kuò)散規(guī)律;應(yīng)用自主研發(fā)的模型試驗(yàn)系統(tǒng),研究了水泥漿鋒面壓力的動(dòng)態(tài)變化規(guī)律,并與理論值進(jìn)行了對(duì)比分析.結(jié)果表明,在滲濾效應(yīng)作用下,沉積層滲透系數(shù)沿漿液擴(kuò)散距離增大;鋒面速度變化率與沉積層滲透系數(shù)呈負(fù)相關(guān);特定擴(kuò)散距離處,鋒面壓力降p'呈先增后減,而鋒面壓力p及平均單位壓力降ΔP'呈先減后增趨勢(shì);鋒面壓力理論值與試驗(yàn)值偏差率僅為.10%~26%,兩者吻合度較高.研究結(jié)論可指導(dǎo)注漿設(shè)計(jì),對(duì)實(shí)際工程具有一定的應(yīng)用價(jià)值.
[Abstract]:Based on the seepage continuity equation Darcy's seepage law, mass conservation equation, linear filtration law and pressure drop equation, the theoretical model of cement slurry front diffusion is established. The migration and filtration mechanism of cement particles and the diffusion law of slurry front under percolation effect are analyzed. The dynamic variation law of cement slurry frontal pressure is studied by using the model test system developed by ourselves and compared with the theoretical value. The results show that under the action of percolation effect. The permeability coefficient of sediment layer increases along the diffusion distance of slurry. There is a negative correlation between the velocity change rate and the permeability coefficient of sedimentary layer. At the specific diffusion distance, the front pressure drop p 'increased first and then decreased, while the front pressure p and the average unit pressure drop 螖 P' decreased first and then increased. The deviation rate between the theoretical value of frontal pressure and the experimental value is only .10 / 26, and the agreement between the two is relatively high. The conclusion of the study can guide the design of grouting and has certain application value to practical engineering.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;山東科技大學(xué)土木工程與建筑學(xué)院;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(編號(hào):2013CB036001) 國(guó)家重點(diǎn)研發(fā)計(jì)劃(編號(hào):2016YFC0801604)資助項(xiàng)目
【分類號(hào)】：TQ172.1
【正文快照】： 1引言隨著我國(guó)經(jīng)濟(jì)的飛速發(fā)展,大規(guī)模水利水電、公路鐵路、深井礦山及城市軌道交通工程相繼投入建設(shè),由于工程面臨的地質(zhì)條件日趨復(fù)雜,以致突水、涌沙、塌方等災(zāi)害時(shí)有發(fā)生,造成了嚴(yán)重的人員傷亡和經(jīng)濟(jì)損失[1~3].其中,城市軌道交通建設(shè)中頻繁遭遇第四系富水沙土層,在地下水滲

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本文編號(hào)：1479649