咬合桩-旋喷锚索基坑支护体系分析

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摘要 研究目的: 以烟台大商城市乐园项目A1地块基坑支护为工程背景,介绍咬合桩-旋喷锚索支护结构在该工程中的应用,提出通过挠度等效确定咬合桩弹性模量的方法,采用有限元软件ABAQUS分析基坑开挖时咬合桩和旋喷锚索受力和变形的规律,研究不同因素对锚索支护效果及基坑稳定性的影响。
研究结论: (1)咬合桩-旋喷锚索支护结构是一种适用于软土地区、安全、经济的基坑支护体系;(2)通过改变旋喷锚索的长度、角度、预应力的设置对基坑支护效果起到重要作用,一定范围内,基坑稳定性随锚索长度增加而提高;锚索倾角在15°时,基坑的稳定性最高;(3)模拟结果和监测对比分析表明,本文所提出的咬合桩弹性模量的挠度等效计算方法是合理的,挠度等效法对咬合桩弹性模量计算起到借鉴作用。

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	张广超
	侯强松
	吉兆腾
	张大帅
	夏溪岑
	刘国冲
	赵红华

关键词 ：数值模拟, 咬合桩, 旋喷锚索, 挠度等效

Abstract：Research purposes: With foundation pit support of Yantai Dashang city park project A1 plot as the engineering background, this paper introduced the secant pile-rotary spray anchor supporting structure in the project. An equivalent elastic modulus method was proposed based on the deflection for the secant pile. Using the finite element software ABAQUS, the deformation and mechanical behavior of secant pile and rotary cable was analyzed during the excavation of the foundation pit. The influence of different factors on anchor cable supporting effect and foundation pit stability was studied.
Research conclusions: (1) The retaining system of secant pile and rotary cable is safe and economical in the soft soil area. (2) By changing the length, angle and setting of prestress of shotcrete anchor cable, the supporting effect of foundation pit plays an important role. In a certain range, the stability of foundation pit increases with the increase of anchor cable length. When the angle of anchor cable is 15°, the stability of foundation pit is the highest. (3) The comparative analysis of simulation results and experiments shows that the proposed equivalent elastic modulus calculation based on deflection is feasible. The deflection equivalence model can be used for reference in the calculation of elastic modulus of secant pile.

Key words： numerical simulation secant pile rotary anchor cable deflection equivalent

收稿日期: 2021-05-31

PACS:

O319.56

作者简介: **张广超,1980年出生,男,现任中建东设岩土工程有限公司副总经理。

引用本文:

张广超, 侯强松, 吉兆腾, 张大帅, 夏溪岑, 刘国冲, 赵红华. 咬合桩-旋喷锚索基坑支护体系分析[J]. 铁道工程学报, 2022, 39(5): 14-19.
ZHANG Guangchao, HOU Qiangsong, JI Zhaoteng, ZHANG Dashuai, XIA Xicen, LIU Guochong, ZHAO Honghua. Analysis of Retaining System of Secant Pile-rotary Anchor Cable for Foundation Pit Excavation. Journal of Railway Engineering Society, 2022, 39(5): 14-19.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I5/14

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