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采用有限元软件ABAQUS来模拟某双排桩支护深基坑开挖过程,并与实际监测数据对比。分析双排桩-土接触面摩擦系数对基坑变形、桩身弯矩、土压力分布等的影响,分析结果表明:摩擦系数对桩顶水平位移及桩身弯矩存在明显影响,但影响程度有限;摩擦系数对坑内被动区土压力分布影响显著,而对主动区影响并不明显。桩-土界面摩擦系数也是影响基坑变形的重要因素。在实际工程中应采取适当的方法来提高桩-土接触界面特性,有利于进一步地控制基坑变形。
The finite element software ABAQUS was used to simulate the excavation process of a deep foundation pit with double-row piles and compared with the actual monitoring data. The effect of friction coefficient of double-row pile-soil contact surface on deformation of foundation pit, bending moment of pile body and distribution of earth pressure is analyzed. The results show that friction coefficient has obvious influence on horizontal displacement of pile top and pile bending moment, The friction coefficient has a significant effect on the earth pressure distribution in the passive zone of the pit, while the impact on the active zone is not obvious. The friction coefficient of pile-soil interface is also an important factor that affects the deformation of foundation pit. In practical engineering, appropriate methods should be taken to improve the characteristics of pile-soil contact interface, which is helpful to further control the deformation of foundation pit.