發(fā)布時(shí)間：2018-11-09 13:36

【摘要】：為分析降雨工況下,滲透力對(duì)粗粒土高路堤邊坡塑性區(qū)分布以及安全系數(shù)變化規(guī)律的影響,依托現(xiàn)場(chǎng)工程實(shí)例,以粗粒土骨架為研究對(duì)象,采用geo-studio軟件中的seep模塊計(jì)算邊坡降雨過程中及降雨停止后水位線、基質(zhì)吸力、滲流梯度的變化規(guī)律;利用FLAC3D內(nèi)置的fish語言將滲流計(jì)算結(jié)果導(dǎo)入到FLAC3D中;綜合考慮水位線、基質(zhì)吸力變化,分析了滲透力變化對(duì)粗粒土高路堤邊坡安全系數(shù)以及塑性區(qū)分布規(guī)律的影響。數(shù)值計(jì)算結(jié)果表明:降雨影響水位線、基質(zhì)吸力、滲流梯度在邊坡空間上的分布;降雨過程中水位線逐漸由坡腳抬升并向粗粒土高路堤邊坡內(nèi)部擴(kuò)展,降雨停止后坡腳處水位線下降較快且路堤中心水位線高于初始狀態(tài)水位線高度;水位線抬升過程中基質(zhì)吸力逐漸消散,降雨停止后基質(zhì)吸力恢復(fù)較緩慢;降雨初期坡腳處x方向滲流梯度逐漸由正值轉(zhuǎn)為負(fù)值且負(fù)值分布的區(qū)域逐漸擴(kuò)大;隨降雨歷時(shí)增加邊坡塑性區(qū)由坡腳不斷向邊坡內(nèi)部逐漸延伸,降雨停止后邊坡塑性區(qū)主要發(fā)生在坡腳處;降雨0~24 h內(nèi)邊坡安全系數(shù)呈逐漸增大的趨勢(shì),降雨24~72 h內(nèi)安全系數(shù)下降較快并達(dá)到最小值,降雨停止后安全系數(shù)逐漸恢復(fù),但安全系數(shù)恢復(fù)過程具有一定滯后性并且恢復(fù)后的數(shù)值小于初始值。
[Abstract]:In order to analyze the influence of permeability on the distribution of plastic zone and the variation of safety factor of high embankment slope under rainfall condition, the skeleton of coarse grained soil is taken as the research object. The seep module in geo-studio software is used to calculate the variation law of water level, matrix suction and seepage gradient in the process of slope rainfall and after the rainfall stops. The seepage calculation results are introduced into FLAC3D by fish language built in FLAC3D. Considering the variation of water level and matrix suction, the influence of seepage force on the safety factor and plastic zone distribution of high embankment slope of coarse grained soil is analyzed. The numerical results show that rainfall affects the distribution of water level line, matrix suction and seepage gradient in the slope space. In the process of rainfall, the water level line gradually rises from the foot of the slope and extends to the inner slope of the high embankment with coarse grained soil. After the rainfall stops, the water level at the foot of the slope decreases faster and the water level at the center of the embankment is higher than the height of the water line in the initial state. The matrix suction gradually dissipates during the elevation of the water level, and the matrix suction recovers slowly after the rainfall stops, and the gradient of the x direction seepage at the foot of the slope gradually changes from positive to negative at the beginning of the rainfall, and the area with the negative distribution expands gradually. With the increase of rainfall duration, the plastic zone of the slope extends gradually from the foot of the slope to the interior of the slope, and the plastic zone of the slope mainly occurs at the foot of the slope after the rainfall stops. The safety factor of slope increases gradually within 24 hours of rainfall, decreases rapidly and reaches the minimum value within 72 hours of rainfall, and recovers gradually after rainfall stops. But the recovery process of safety factor has some lag and the value after recovery is smaller than the initial value.
【作者單位】： 長(zhǎng)沙理工大學(xué)特殊環(huán)境道路工程湖南省重點(diǎn)實(shí)驗(yàn)室;長(zhǎng)沙理工大學(xué)交通運(yùn)輸工程學(xué)院;長(zhǎng)沙理工大學(xué)土木與建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51508042,51508040,51678073,51578079) 特殊環(huán)境道路工程湖南省重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(kfj140501) 湖南省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016SK2023)
【分類號(hào)】：U416.12

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