破坏包络面理论在多基础系统中的应用研究

发布时间：2018-03-26 19:40

  本文选题：破坏包络面　切入点：多基础系统　出处：《岩土力学》2016年06期

【摘要】：由多个分离基础组成的多基础系统是常用的海洋结构基础型式。基于破坏包络面理论,分析了砂土地基多基础系统的失效模式,建立了相应的承载力计算方法,并验证了计算方法的可行性。对比分析了单一基础和多基础系统不同荷载路径下的荷载安全系数,探讨了破坏包络面理论与分项系数法相结合的基础承载力计算方法。失效模式的分析表明,由于水平荷载的增大,四腿平台结构迎浪侧基础首先到达破坏包络线,其失效模式属于滑动失稳,但由于基础间的运动约束,其并不会出现真正的滑移破坏。随着水平荷载进一步地增大,迎浪侧基础承担的水平和竖向荷载不断减小,导致背浪侧基础受到不断增大的荷载。最终,背浪侧基础也到达破坏包络线,多基础系统失效。分析表明,荷载路径对基础的荷载安全系数有决定性的影响,计算基础的荷载安全系数需指明相应的荷载路径。鉴于破坏包络面的大小和形状取决于众多因素,基础设计时需采用特定工况下的破坏包络面进行承载力计算。
[Abstract]:Based on the theory of failure envelope surface, the failure mode of multi-foundation system of sand foundation is analyzed, and the corresponding calculation method of bearing capacity is established. The feasibility of the calculation method is verified, and the load safety factors of single foundation system and multi-foundation system under different load paths are compared and analyzed. The calculation method of foundation bearing capacity based on failure envelope theory and sub-factor method is discussed. The failure mode analysis shows that the foundation of four-legged platform structure first reaches the damage envelope due to the increase of horizontal load. The failure mode belongs to sliding instability, but due to the movement constraint between foundations, there is no real slip failure. As the horizontal load increases further, the horizontal and vertical loads of the foundation on the wave side decrease continuously. The analysis shows that the load path has a decisive effect on the load safety factor of the foundation. In order to calculate the load safety factor of the foundation, the load path should be pointed out. In view of the fact that the size and shape of the failure envelope depends on many factors, the bearing capacity of the foundation should be calculated by using the failure envelope under specific conditions.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;中交天津港湾工程研究院有限公司;交通运输部规划研究院;
【分类号】：P75;TU475
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本文编号：1669342