复杂条件下挡土墙地震土压力统一解.pdf

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1、第31卷第3期2014年3月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01．31No．3Mar．2014doi：10．3969／j．issrr1002—0268．2014．03．009复杂条件下挡土墙地震土压力统一解柯才桐，陈奕柏，高洪波，谢洪波(海南大学土木建筑工程学院，海南海口570228)摘要：针对Mononobe-Okabe理论的不足，从滑动楔体处于极限状态时力的平衡条件出发，结合拟静力法与闭合力矢量多边形法，推导了考虑滑裂面上填土的黏聚力、墙土问黏着力、均布超载、填土开裂及地震荷

2、载作用等条件下的黏性土主被动土压力计算式，并通过图解法给出了临界破裂角的显式解答。在相应简化条件下Mononobe．Okabe理论计算式为该公式的特例。研究表明：不考虑地震荷载对均布超载的影响，得到主动土压力偏小而被动土压力偏大；地震条件下的主动与被动土压力随水平地震系数的递增分别增大与减小，随竖向地震系数递增均减小；当水平地震系数取值较大时，将出现随竖向地震系数递增主动土压力先减小后增大的特殊情况。关键词：道路工程；挡土墙；拟静力法；地震土压力；主动土压力；黏性土；均布超载中图分类号：TU432文献标识码：A文章编号：1002—0268(2014)03—0049—07

3、UnifiedSolutionofSeismicEarthPressureActingonRetainingWallunderComplicatedConditionKECai—tong，CHENYi—bo，GAOHong—bo，XIEHong-bo(CollegeofCivilEngineeringandArchitecture，HainanUniversity，HaikouHainan570228，China)Abstract：AimingattheinsufficiencyoftheMononobe—Okabeegrthpressuretheory，fromthe

4、conditionoftheequilibriumoftheforcewhentheslidewedgeisinlimitequilibrium，usingthepseudo·staticmethodandthevectorpolygonmethodofclosingforce，theactiveandpassiveearthpressureformulasofcohesivesoilwhichconsiderthecohesionforceonslidingplane，theadhesiveforceoninterfaceofsoilandretainingwall，

5、theuniformlydistributedoverload，backilllcracksandseismiclcadsalederived．andtheexplicitsolutionsofthecriticalruptureanglearegiventhroughgraphicalmethod．Mononobe—Okabe’Stheoreticalcalculationformulaisaspecialcaseoftheproposedformulaundercorrespondingsimplifiedsituations．Theresultshowsthat(

6、1)ignoringtheeffectofseismicforceonuniformlydistributedoverload，theactiveearthpressureissmallwhilethepassiveislarge；(2)undertheconditionofearthquake，ashorizontalseismiccoefficientaccumulates．theactiveearthpressuregetslargerandthepassivegetssmaller，whileasverticalseismiccoefficientaccumul

7、ates，theybothgetssmaller；(3)whenhorizontalseismiccoefficientisrelativelylarger，a8verticalseismiccoefficientaccumulates，itwillcometoaspecialcasethattheactiveearthpressuregetssmallerfirstandthenlarger．Keywords：roadengineering；retainingwall；pseudo-staticmethod；seismicearthpr