隧道开挖引起水平向位移被动桩的简化计算方法
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1.浙江大学 滨海和城市岩土工程研究中心 ,浙江 杭州;2.浙江省大成建设集团有限公司,浙江 杭州;3.浙江杭海城际铁路有限公司,浙江 嘉兴;4.浙江大学 滨海和城市岩土工程研究中心,浙江 杭州

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基金项目:

国家杰出青年科学基金,国家自然科学基金项目(面上项目,重点项目,重大项目),浙江省自然科学基金委员会-华东院联合基金


Simplified method of passive pile with lateral displacement caused by tunneling
Author:
Affiliation:

1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University;2.Zhejiang Dacheng Construction Group Co., Ltd., Hangzhou 310012, P.R. China;3.Zhejiang Hanghai Intercity railway Co., Ltd., Jiaxing;4.Zhejiang Dacheng Construction Group Co., Ltd., Hangzhou;5.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou

Fund Project:

National Natural Science Foundation of China (U1934208); The National Science Fund for Distinguished Young Scholars (No.51725802); National Natural Science Foundation of China (No. 51878276);the Zhejiang Natural Science Foundation (LHZ19E080001)

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    摘要:

    目前大部分盾构隧道开挖对邻近桩基影响的理论研究是将被动桩简化成单参数的Winkler地基模型和双参数的Pasternak地基模型,较少考虑计算精度更高的三参数Kerr地基模型。本文基于Kerr地基模型建立被动桩的水平挠度控制方程。结合盾构隧道开挖施加的水平附加应力,利用差分法计算得到盾构开挖对邻近桩基的数学矩阵解析表达式,随后得到被动桩的水平变形位移半解析解。通过两个工程实例的验证,Kerr地基模型相比于Winkler、Pasternak地基模型的计算结果更加符合实测数据。参数分析表明:随着隧道直径的增大,被动桩水平位移会增加;增大桩基的直径,被动桩水平位移会减小;对于桩底以下隧道开挖情况,增大桩基与盾构开挖的水平距离和竖向净距,被动桩水平位移均会减小。

    Abstract:

    At present, the studies on pile foundation deformation caused by adjacent tunneling are generally based on one parameter Winkler foundation model or two parameters Pasternak foundation model, few study is considering in three parameters Kerr foundation model with greater computational accuracy. Based on Kerr foundation model, The governing equation of horizontal deflection of passive pile is established. Combining with the horizontal additional stress imposed by shield excavation, the analytical expression of the mathematical matrix of tunneling on the adjacent pile foundation is obtained by using the different method, and then the horizontaldeformation displacement solution of the passive pile is obtained. Comparing the solution in Winkler, Pasternak foundation model with two solution above, the results of kerr foundation model are closed to the result of two actually measurements. The results of parameter analysis shows that the horizontal displacement increase with the diameter of the tunnel increase. With the increase of the passive pile diameter, horizontal displacement of the passive pile decrease. Passive pile displacement decrease with the increase of the horizontal distance or vertical distance between the passive pile and tunneling in the condition of the tunnel excavation under the pile bottom.

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历史
  • 收稿日期:2020-06-06
  • 最后修改日期:2020-07-01
  • 录用日期:2020-07-04
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