地震工程学报
地震工程學報
지진공정학보
China Earthquake Engineering Journal
2015年
2期
422-427
,共6页
泥化夹层%反倾边坡%大型振动台%放大系数%位移
泥化夾層%反傾邊坡%大型振動檯%放大繫數%位移
니화협층%반경변파%대형진동태%방대계수%위이
siltized interlayer%anti-inclined slope%large-scale shaking-table%amplification coeffi-cient%displacement
针对含泥化夹层反倾岩质边坡制作相似比为1∶30的试验模型进行大型振动台试验，研究泥化夹层饱水前(天然含水状态)和饱水状态下边坡的加速度和位移响应规律，探讨边坡的破坏模式。试验结果表明：泥化夹层饱水后坡面水平向加速度放大系数小于饱水前；泥化夹层饱水前和饱水后随着相对高度的增加，坡面水平向加速度放大系数呈现非线性增加的趋势，其整体上大于坡体内部的加速度放大系数；坡面位移从下至上在泥化夹层饱水前，呈现出非线性增长特性；饱水后位移呈先增大后减小，临近坡肩处坡面最大，坡面呈现鼓出形态。泥化夹层饱水前，在幅值为0.3 g 的地震波作用下坡体仅出现坡肩局部掉块；饱水后，输入地震动幅值≥0.4 g 时，坡体先出现坡肩的局部掉块，随后坡体沿中上部的饱和泥化夹层滑动剪出，与此同时，坡体中上部出现纵向裂隙并与水平裂隙贯通，坡顶被震碎。
針對含泥化夾層反傾巖質邊坡製作相似比為1∶30的試驗模型進行大型振動檯試驗，研究泥化夾層飽水前(天然含水狀態)和飽水狀態下邊坡的加速度和位移響應規律，探討邊坡的破壞模式。試驗結果錶明：泥化夾層飽水後坡麵水平嚮加速度放大繫數小于飽水前；泥化夾層飽水前和飽水後隨著相對高度的增加，坡麵水平嚮加速度放大繫數呈現非線性增加的趨勢，其整體上大于坡體內部的加速度放大繫數；坡麵位移從下至上在泥化夾層飽水前，呈現齣非線性增長特性；飽水後位移呈先增大後減小，臨近坡肩處坡麵最大，坡麵呈現鼓齣形態。泥化夾層飽水前，在幅值為0.3 g 的地震波作用下坡體僅齣現坡肩跼部掉塊；飽水後，輸入地震動幅值≥0.4 g 時，坡體先齣現坡肩的跼部掉塊，隨後坡體沿中上部的飽和泥化夾層滑動剪齣，與此同時，坡體中上部齣現縱嚮裂隙併與水平裂隙貫通，坡頂被震碎。
침대함니화협층반경암질변파제작상사비위1∶30적시험모형진행대형진동태시험，연구니화협층포수전(천연함수상태)화포수상태하변파적가속도화위이향응규률，탐토변파적파배모식。시험결과표명：니화협층포수후파면수평향가속도방대계수소우포수전；니화협층포수전화포수후수착상대고도적증가，파면수평향가속도방대계수정현비선성증가적추세，기정체상대우파체내부적가속도방대계수；파면위이종하지상재니화협층포수전，정현출비선성증장특성；포수후위이정선증대후감소，림근파견처파면최대，파면정현고출형태。니화협층포수전，재폭치위0.3 g 적지진파작용하파체부출현파견국부도괴；포수후，수입지진동폭치≥0.4 g 시，파체선출현파견적국부도괴，수후파체연중상부적포화니화협층활동전출，여차동시，파체중상부출현종향렬극병여수평렬극관통，파정피진쇄。
A 1:30 scale model of an anti-inclined rock slope interlayered with silt was constructed, and a large-scale shaking-table test was performed to study the dynamic responses (acceleration and displacement)when the moisture content of silt layers change.The results are as follows:the horizontal amplification coefficients on the slope face after the silt layers became saturated were less than those before saturation;the coefficients increased with slope height in a nonlinear fash-ion;the coefficients on the slope face were larger than those in the slope body;before saturation, the displacement of the slope face increased in a nonlinear fashion with an increase in height;the displacement of the upper slope face (relative height between 0.6 and 0.9)was larger than those in other sections;after saturation,the displacement first increased and then decreased with in-creasing height,maximum displacement occurred near the top of the slope;and the slope displayed a bulging shape.Before saturation,slope failure occurs when the amplitude of the seismic wave is 0.3 g.After saturation,when the amplitude is no less than 0.4 g,first,slope failure occurs at the shoulder,then the slope slides and shears out from the upper levels,and simultaneously,longitu-dinal cracks appear and intersect with the horizontal fractures.The top of slope is left shattered.
