全埋式抗滑桩倾覆破坏的室内模型试验研究

发布时间：2018-01-23 05:11

本文关键词： 全埋式抗滑桩模型试验动态监测数值模拟　出处：《岩土力学》2014年08期 　论文类型：期刊论文

【摘要】：基于室内推桩模型试验研究全埋式抗滑桩的倾覆破坏及受力变形特征:在满足各试验相似关系的前提下,建立室内模型试验池,观察模型桩从受荷到倾覆破坏的全过程。布设土压力盒、钢筋应变片、混凝土应变片及百分表,采用多通道动态测试系统,对桩身应变、钢筋应变、桩顶位移与土压力进行全方位的动态监测,分析模型桩的受力特性。研究结果表明,在滑坡推力作用下,桩顶水平位移与荷载之间大致呈现三折线关系,而且在锚固深度不够的情况下,桩的破坏形式为整体的刚性转动(倾覆破坏)。对土压力监测结果以及反推的桩身弯矩表明,桩身土压力分布曲线表现为上下小、中间大的近似抛物线分布,桩身最大土压力出现在桩中部;各级荷载作用下,桩身最大弯矩值出现在滑面处,桩顶及桩底弯矩值较小。
[Abstract]:The overturning failure and deformation characteristics of full-buried anti-slide pile are studied based on the model test of indoor push-pile. The indoor model test pool is established on the premise of satisfying the similarity of each test. Observe the whole process of model pile from loading to overturning failure. Set up earth pressure box, steel strain gauge, concrete strain gauge and percentile, adopt multi-channel dynamic testing system, to pile body strain, reinforcement strain. The dynamic monitoring of pile top displacement and earth pressure is carried out, and the stress characteristics of model pile are analyzed. The results show that under the action of landslide thrust, the horizontal displacement of pile top and the load are approximately three broken lines. Moreover, when the anchoring depth is not enough, the failure form of the pile is rigid rotation of the whole (overturning failure). The monitoring results of earth pressure and the bending moment of the pile body back push indicate. The distribution curve of soil pressure of pile body is similar to parabola distribution, which is small up and down, and the maximum earth pressure of pile body appears in the middle of pile. Under various loads, the maximum bending moment of pile body appears at the slip surface, and the bending moment value of pile top and bottom is smaller.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;无锡花样年房地产开发有限公司;重庆蜀通岩土工程有限公司;
【基金】：中央高校基本科研业务费(No.106112013CDJZR200008) 重庆市国土资源和房屋管理局科技计划项目(No.CQGT-2012021) 长江学者和创新团队发展计划资助(No.IRT1045)
【分类号】：TU473.13
【正文快照】： 1引言自20世纪30年代以来,抗滑桩作为一种有效的治理手段,已经在各种滑坡治理工程中得到了广泛的应用[1]。国内外众多学者[2-12]对抗滑桩的受力性能进行了研究,如董捷等[6]结合岩石强度理论和有限元法为基础,分析了桩体锚固段岩体的受力特点和变形破坏模式,其对嵌岩抗滑桩的设

【相似文献】