本文選題：土力學(xué)　切入點(diǎn)：泥炭質(zhì)土　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年05期

【摘要】：工程實(shí)踐中,泥炭質(zhì)土由于富含有機(jī)質(zhì),具有高含水量、低密度、超高壓縮性以及低強(qiáng)度的異常力學(xué)特性,往往被視為問(wèn)題土。針對(duì)昆明地區(qū)交通荷載作用下泥炭質(zhì)土的動(dòng)力響應(yīng)特征,選取滇池草海附近典型泥炭質(zhì)土,開(kāi)展考慮圍壓水平、動(dòng)應(yīng)力幅值以及靜偏應(yīng)力影響的不排水循環(huán)三軸試驗(yàn),研究該土的長(zhǎng)期累積變形特性。研究表明:研究土樣具有典型泥炭質(zhì)土特征,表現(xiàn)為含水量181.5%~259.3%,密度1.10~1.22 g/cm~3、有機(jī)質(zhì)含量29.9%~53.0%,有機(jī)物質(zhì)分解度較高;動(dòng)應(yīng)力幅值和靜偏應(yīng)力對(duì)昆明泥炭質(zhì)土的長(zhǎng)期動(dòng)力特性影響顯著,大動(dòng)應(yīng)力幅值和靜偏應(yīng)力加劇累積變形和孔壓的發(fā)展,同時(shí),當(dāng)動(dòng)應(yīng)力水平小而靜偏應(yīng)力大時(shí),累積塑性變形的發(fā)展速度反而大;雖然初始圍壓對(duì)累積變形影響較小,但對(duì)殘余孔壓的影響顯著。此外,基于雙對(duì)數(shù)坐標(biāo)下累積應(yīng)變速率與循環(huán)周次關(guān)系以及前人研究方法,建立了泥炭質(zhì)土累積塑性應(yīng)變與動(dòng)荷載循環(huán)周次間的經(jīng)驗(yàn)關(guān)系。
[Abstract]:In engineering practice, peat soil is often regarded as a problem soil because of its rich organic matter, high moisture content, low density, ultra-high compressibility and low strength.According to the dynamic response characteristics of peat soil under traffic load in Kunming area, the undrained cyclic triaxial test was carried out considering the influence of confining pressure, dynamic stress amplitude and static deflection stress on typical peat soil near Caohai, Dianchi Lake.The long-term cumulative deformation of the soil is studied.The amplitude of large dynamic stress and static deflection stress aggravate the development of cumulative deformation and pore pressure. At the same time, when the dynamic stress level is small and the static deflection stress is large, the development speed of cumulative plastic deformation is larger, although the initial confining pressure has little effect on cumulative deformation.However, the residual pore pressure is significantly affected.In addition, based on the relationship between cumulative strain rate and cyclic cycles in double logarithmic coordinates and previous research methods, the empirical relationship between cumulative plastic strain and cyclic cycles of peat soil is established.
【作者單位】： 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;中原工學(xué)院建筑工程學(xué)院;天津城建大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(41402277,41672293) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2010CB732101)~~
【分類(lèi)號(hào)】：TU41

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本文編號(hào)：1690914