2013年12月上 施工技术 第42卷第23期 CONSTRUCTION TECHNOLOCY 101 DO1:10. 7672/sgjs2013230101 夯填边坡稳定性研究* 韩云山',杨印旺²,董彦莉,安明²,申光凝 (1.中北大学土木工程系,山西太原030051;2.山西机械化建设集团公司,山西太原030009) [摘要】基于应力分析的边坡稳定性分析有限元法不但满足力的平衡条件,而且考虑了材料的应力、应变关系,使 得计算结果更加合理。
采用非线性有限元强度折减法对某电厂地基处理中所涉及的高填方夯填边坡进行了稳定 性研究。
研究结果表明,该边坡工程设计安全可靠。
通过改变坡率计算其边坡安全系数,得出了安全系数随坡率 变化的规律,研究了坡率对边坡稳定性的影响。
最后,分析了坡面形式的变化对边坡稳定性的影响。
[关键词]地基;边坡稳定性;强度折减法;安全系数;有限元分析 [中图分类号】TU43;TU753 [文献标识码】A [文章编号]1002-8498(2013)23-0101-03 StudyonStabilityforPuddleBackfillSlope Han Yunshan',Yang Yinwang²,Dong Yanli',An Ming²,Shen Guangning (1.Department of Civil Engineering,NorthUniverity of ChinaTaiyuan,Shanxi030051,China; 2.Shanxi Mechanisation Construction Group Company,Taiyuan,Shanxi 030009,China) Abstract;Based on the stress analysis, the finite element method for slope stability can meet the force equilibrium condition when considering the stress and strain relationship of the material. The FEM for slope stability can make the putation results much more accurate and reasonable. The stability of high-illed ramming slope inapower plant is investigated in this paper using strength reductionmethod with nonlinear finite element.It is can be drawn out that the design of the slope is safe and reliable from the numerical results. The effect of the slope ratio on the stability is also studied in this paper. The relationship between the safety factors and slope ratio is obtained by puting the safety factors considering the change of the slope ratio.Finally,theeffctof the slope fomon the stabilityisanalyzed. Key words;subgrade;slope stability; strength reduction method; safety factors;finite element analysis 对于边坡稳定性分析,我国目前常用方法是建1工程概况 立在极限平衡理论基础上的条分法,包括瑞典圆弧贵州某电厂厂坪自然地面标高1015.000~ 法、简化Bishop法(1和Morgensterm-Price法[2-3]等。
1125.000m,高差约110m,地基土表层中的冲洪积 用极限平衡法进行稳定性分析通常满足力和力矩层和残坡积层中含有相当数量的高饱和软土,承载 平衡,未考虑土体本身的应力、应变关系[-],另一 力80kPa,压缩模量3~4MPa。
高填方最大填方高 个局限是对较复杂的土层及土工结构计算困难。
度35m,坡率为1:2,填料主要以泥岩和残坡积粉质 而采用有限元方法分析边坡稳定性问题克服了极 黏土为主。
限平衡法中将土条假设为刚体的缺点,考虑了土体 高填方地基多采用...