陡坡岩石地基抗滑桩有效嵌固深度的确定  

Determination of effective embedding depth of anti-slide pilein rock foundation of steep slope

作　　者：贺建清[1] 曾治国[1] 梅松华 高文华[1] He Jianqing;Zeng Zhiguo;Mei Songhua;Gao Wenhua(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,411201,Xiangtan,China;Hunan Provincial Key Laboratory of Hydropower Development Key Technology,410014,Changsha,China;Powerchina Zhongnan Engineering Corporation Limited,410014,Changsha,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测省重点实验室,湘潭411201 [2]水能资源利用关键技术湖南省重点实验室,长沙410014 [3]中国电建集团中南勘测设计研究院有限公司,长沙410014

出　　处：《应用力学学报》2020年第6期2489-2495,I0012,I0013,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(41272324);湖南省自然科学基金(2017JJ4039);湖南省教育厅科学研究项目(18A189)。

摘　　要：对桩前楔体进行受力分析,建立极限平衡方程,求解极值并确定楔体破裂角,进而提出楔体临界深度的计算方法。通过工程实例验证了该计算方法的可行性,并分析了陡坡岩石地基坡角、地基岩体抗剪强度指标(黏聚力、内摩擦角)、楔体自重、桩宽、岩体压力扩散角对桩前楔体破裂角及临界深度的影响。研究发现:陡坡岩石地基坡角、地基岩体的抗剪强度指标(黏聚力、内摩擦角)、楔体自重对桩前楔体破裂角及临界深度均有较大影响;桩宽、岩体压力扩散角对桩前楔体临界深度有一定影响,但对其破裂角的影响不大。本文研究成果对确定抗滑桩的有效嵌固深度,指导陡坡岩石地基抗滑桩的设计和施工具有重要的工程意义。Based on the stress analysis of the wedge in front of the pile, the limit equilibrium equation is established and the extreme value is solved to determine the wedge fracture angle, and then the calculation method of the critical depth of the wedge is proposed. In addition, the feasibility of the calculation method is verified byengineering examples, and the influences of slope angle of steep slope rock foundation, shear strength index of foundation rock(cohesion force, internal friction angle), wedge weight, pile width and rock mass pressure diffusion angle on wedge fracture angle and critical depth of pile front are analyzed. It is found that the slope angle of steep slope rock foundation, shear strength index(cohesion, internal friction angle) and wedge weight have great influence on wedge failure angle and critical depth in front of pile. Pile width and rock pressure diffusion angle have certain influence on critical depth of wedge in front of pile, but have little influence on its fracture angle. The research results have important engineering significance for determining the effective embedded depth of anti-slide pile and guiding the design and construction of anti-slide pile on steep rock foundation.

关 键 词：陡坡 抗滑桩 嵌固深度 楔体 破裂角 临界深度 

分 类 号：O319.56[理学—一般力学与力学基础]