基于弹性基础梁法的桩锚支护结构力学模型受力计算

IF 1.5 Q3 MECHANICS
Zhang Shihao, Han Lingjie, Tang Huarui
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引用次数: 0

摘要

随着深基坑工程在工程建设中的广泛应用,深基坑支护工程的受力计算问题已成为当今工程建设过程中普遍存在的问题。本文在弹性基础梁法的基础上,提出了桩锚结构的简化力学模型,为深基坑支护结构的受力和变形计算提供了系统实用的计算方法。该方法将支护结构简化为竖向布置的弹性基础梁,将支护、锚杆和土工体用弹簧系统代替,利用土工土的变形模量计算土工土的弹簧刚度,提出了一种系统的基坑工程建筑结构动力特性的计算方法;基于某深基坑工程监测数据,对本文提出的简化力学模型计算方法进行了验证,并将理论计算值与现场监测结果进行了对比;对桩锚支护结构的详细参数进行单因素分析,研究索预应力、索倾角、桩径、桩长等相关参数对支护结构变形和应力特性的影响。然后对各因素进行正交组合,提出优化设计方案。结果表明:计算值的最大沉降变形量为23.437 mm,监测值的最大沉降变形量为26.517 mm,两者相差不大。第二层和第三层锚杆分别施加150 kN和250 kN水平预应力后,最大弯矩为1210 kN⋅m。优化后的桩排最大弯矩为336.87 kN⋅m,桩身最大水平位移为16.505 mm,比原设计减小11.97%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Force Calculation of Mechanical Model of Pile-anchored Support Structure Based on Elastic Foundation Beam Method
With the widespread use of deep foundation pit engineering in engineering construction, the force calculation problem about deep foundation pit support engineering has become a common problem in today’s engineering construction process. In this paper, based on the elastic foundation beam method, a simplified mechanical model of pile-anchored structure is proposed, and a systematic and practical calculation method is proposed for the force and deformation calculation of deep foundation pit support structure. The method simplifies the support structure as a vertically placed elastic foundation beam, the support, anchor and geotechnical body are replaced by a spring system, the spring stiffness of geotechnical soil can be calculated by the deformation modulus of geotechnical soil, and a systematic calculation method is proposed for the dynamic characteristics of the construction and structure of the foundation pit project; Based on the monitoring data of a deep foundation pit project, the calculation method of the simplified mechanical model proposed in this paper is verified, and the theoretical calculation value is compared with the field monitoring results; Single factor analysis is carried out on the detailed parameters of pile-anchor supporting structure to study the influence of cable prestress, cable dip Angle, pile diameter, pile length and other related parameters on the deformation and stress characteristics of supporting structure. Then the orthogonal combination of all factors is carried out to propose the optimization design. The results show that the maximum settlement deformation of the calculated value is 23.437 mm, and the maximum settlement deformation of the monitored value is 26.517 mm, and the difference between them is small. The maximum bending moment is 1210 kN⋅m after 150 kN and 250 kN horizontal prestressing is added to the second- and third-layer anchors respectively. After optimization, the maximum bending moment of pile row is 336.87 kN⋅m, and the maximum horizontal displacement of pile body is 16.505 mm, which is reduced by 11.97% compared with the original design.
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来源期刊
CiteScore
1.70
自引率
8.30%
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