發(fā)布時間：2018-01-31 17:56

  本文關鍵詞： 滲濾效應 水泥漿 鋒面 流速 壓力　出處：《中國科學:技術科學》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、線性濾過定律及壓力降方程,建立了水泥漿鋒面擴散理論模型,分析了滲濾效應下水泥顆粒的運移濾出機制和漿液鋒面的擴散規(guī)律;應用自主研發(fā)的模型試驗系統(tǒng),研究了水泥漿鋒面壓力的動態(tài)變化規(guī)律,并與理論值進行了對比分析.結果表明,在滲濾效應作用下,沉積層滲透系數(shù)沿漿液擴散距離增大;鋒面速度變化率與沉積層滲透系數(shù)呈負相關;特定擴散距離處,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;鋒面壓力理論值與試驗值偏差率僅為.10%~26%,兩者吻合度較高.研究結論可指導注漿設計,對實際工程具有一定的應用價值.
[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】： 山東大學巖土與結構工程研究中心;山東科技大學土木工程與建筑學院;
【基金】：國家重點基礎研究發(fā)展計劃(編號:2013CB036001) 國家重點研發(fā)計劃(編號:2016YFC0801604)資助項目
【分類號】：TQ172.1
【正文快照】： 1引言隨著我國經(jīng)濟的飛速發(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,由于工程面臨的地質(zhì)條件日趨復雜,以致突水、涌沙、塌方等災害時有發(fā)生,造成了嚴重的人員傷亡和經(jīng)濟損失[1~3].其中,城市軌道交通建設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：1479649