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馬    迪

（ 陜西師范大學國有資產管理處 ，陜西 西安 710119)

摘   要 ：本文介紹了兩種計算堆載對鄰近單樁影響的方法： 目前較常用的是將土和樁的響應分開求解的非耦合方法；另一種為使用顯式耦合歐拉－拉格朗日( CEL)技術建立數值分析模型。計算并比較了耦合／非耦合方法所得的樁基響應，并分析其結果差異的原因。此外，應用CEL 耦合模型對堆載間距、強度、樁徑進行參數敏感性分析得出： (1)  堆載距離單樁越近 ，0 ~ 5 m 深度內樁的水平位移越大 ，樁頂位置尤其突出。間距為1 . 0 B 時彎矩最大值相對于間距 0. 5 B 減小約 71%、間距為 1 . 5 B 時彎矩最大值相對于間距 B 減小約57. 3% ;   (2)   堆 載強度增加，樁身水平位移增加。堆載下沉深度為 0.05 B 時樁基彎矩最大值與下沉 0. 1 B 基本一致，只是彎矩最大值點深度增加；堆載下沉深度為 0. 15 B 時樁基彎矩最大值相對于下沉 0. 1  B 增加約 88. 3% ; ( 3) 樁徑由 0. 375 m增大到0. 75 m 可使樁頂位移減小 82%, 樁基相對彎矩  ( M/EI)最大值減小 73% 。

關鍵詞 ：堆載 ；耦合法 ；非耦合法 ；耦合歐拉－拉格朗日法 ；CEL;  數值分析 ；土體變形

中圖分類號 ：TU473 . 1           

文獻標志碼 ：A            

文章編號 ：1005- 8249   (2023)  03- 0007- 08

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 03 . 007

MA Di

( State  Owned Assets Management Department ,   Shaanxi  Normal University ,   Xi ’an 710119 ,   China)

Abstract: This paper introduces two methods for calculating the effect of surcharge loading on adjacent monopile: the state-of-practice to this problem is an un-coupled approach by solving the soil and pile response separately; the other is an advanced 3D continuum finite element analysis methodology using Explicit Coupled Eulerian Lagrangian (CEL) technique. And calculates and compares the pile foundation responses obtained by coupled/un-coupled methods, and analyzes the reasons for the differences in their results. In addition, the CEL coupling model was applied to conduct parameter sensitivity analysis on the surcharge spacing, strength, and pile diameter. It was found that: (1) The closer the stacking distance is, the greater the horizontal displacement of the pile within a depth of 0-5m, and the more prominent the pile top position. When the spacing is 1.0B, the maximum bending moment decreases by about 71% relative to the spacing of 0.5B, and when the spacing is 1.5B, the maximum bending moment decreases by about 57.3% relative to the spacing of B. The surcharge strength increases, the horizontal displacement of the pile body increases. When the pile foundation sinking depth is 0.05B, the maximum bending moment of the pile foundation is basically the same as the sinking depth of 0.1B, but the depth of the maximum bending moment point increases. The maximum bending moment of the pile foundation increases by about 88.3% compared to the settlement of 0.1B when the depth of pile settlement is 0.15B.(3) Increasing the pile diameter from 0.375m to 0.75m can reduce the pile top displacement by 82% , and the maximum relative bending moment (M/EI) of the pile foundation reduce by 73%.

 Keywords: surcharge loading; coupled method; uncoupled method; coupled eulerian-lagrangian method; CEL; numerical analysis; soil deformation

作者簡介：馬迪  (1993—),  男，碩士，主要從事巖土工程研究等工作。

收稿日期：2023- 03- 13