【作者】 赵明华； 蒋冲； 曹文贵；

【Author】 ZHAO Ming-hua JIANG Chong CAO Wen-gui (Geotechnical Eng.Institute,Hunan Univ.,Changsha 410082,China)

【机构】 湖南大学岩土工程研究所；

【摘要】 根据岩溶区桩端溶洞顶板的工程特点,建立符合其工程特点的岩溶区桥梁基桩下伏溶洞顶板的固支梁力学模型；引进突变理论,通过建立岩溶区桥梁基桩下伏溶洞顶板系统的能量势函数和分叉集方程,建立岩溶区桥梁基桩下伏溶洞顶板安全厚度确定的尖点突变模型。通过研究岩溶区桥梁基桩下伏溶洞顶板失稳破坏条件,建立了岩溶区桥梁基桩下伏溶洞顶板安全厚度的确定方法。工程实例分析表明该方法能满足工程要求,具有一定的理论与工程实用价值。更多还原

【Abstract】 According to the engineering features of rock-socked in karst region.The clamped beam mechanical mod- el of rock-socked in karst region is set up at first.Secondly,based on the catastrophe theory,the cusp catastrophe model of rock-socked pile load-bearing capacity and cave roof safe thickness in karst region is established,at the same time,the necessary instability conditions of cave roof are deduced,and then the determining methods of safe thickness of cave roof under pile and load-bearing capacity of rock-socked pile are proposed.At last,the method is applied to two practical engineering projects and the results can meet the requirements of engineering,so it has the- oretical and engineering practical value.更多还原