中南大学学报(自然科学版)
中南大學學報(自然科學版)
중남대학학보(자연과학판)
JOURNAL OF CENTRAL SOUTH UNIVERSITY
2009年
6期
1751-1755
,共5页
周期荷载%土钉支护%土钉轴力%坡顶沉降%累积效应
週期荷載%土釘支護%土釘軸力%坡頂沉降%纍積效應
주기하재%토정지호%토정축력%파정침강%루적효응
cyclic load%soil nailing%axial force of soil nails%settlement of slope crest%accumulative effect
针对交通荷载下土钉支护边坡的力学特征,将交通荷载简化为循环荷载,以室内模型试验为基础,基于Mohr-Coulomb准则,建立土钉支护动力稳定分析的弹塑性平面应变有限元模型,加载频率为2 Hz,加载幅值为10-30 kPa.研究结果表明:坡面位移随循环加载次数增加而增大,出现明显的累积效应,坡顶沉降出现沉降槽,累积效应不明显;土钉轴力的变化与位置有关,在动载下,靠近坡顶的轴力增加较大,但随着循环加载次数增加出现衰减效应,下部土钉轴力变化不大;室内模型试验结果与数值模拟结果存在一致性.
針對交通荷載下土釘支護邊坡的力學特徵,將交通荷載簡化為循環荷載,以室內模型試驗為基礎,基于Mohr-Coulomb準則,建立土釘支護動力穩定分析的彈塑性平麵應變有限元模型,加載頻率為2 Hz,加載幅值為10-30 kPa.研究結果錶明:坡麵位移隨循環加載次數增加而增大,齣現明顯的纍積效應,坡頂沉降齣現沉降槽,纍積效應不明顯;土釘軸力的變化與位置有關,在動載下,靠近坡頂的軸力增加較大,但隨著循環加載次數增加齣現衰減效應,下部土釘軸力變化不大;室內模型試驗結果與數值模擬結果存在一緻性.
침대교통하재하토정지호변파적역학특정,장교통하재간화위순배하재,이실내모형시험위기출,기우Mohr-Coulomb준칙,건립토정지호동력은정분석적탄소성평면응변유한원모형,가재빈솔위2 Hz,가재폭치위10-30 kPa.연구결과표명:파면위이수순배가재차수증가이증대,출현명현적루적효응,파정침강출현침강조,루적효응불명현;토정축력적변화여위치유관,재동재하,고근파정적축력증가교대,단수착순배가재차수증가출현쇠감효응,하부토정축력변화불대;실내모형시험결과여수치모의결과존재일치성.
According to the mechanism of soil nailing, traffic load was simplified as cyclic load, an elasto-plastic finite element model was set up under dynamic load based on Mohr-Coulomb criterion, with frequency of 2 Hz and load intensity of 10-30 kPa. The results show that the displacement of panel increases with the increase of cyclic load number, indicating obvious accumulative effect. The shape of settlement of slope crest is half-bowl with unobvious accumulative effect. Axial force of soil nails has obvious increment at upper position, whereas no distinct increment at lower position, and the increment shows attenuation with cyclic number. The experimental results are in accordance with the simulated ones.