前排傾斜雙排樁支護性狀有限元分析*
                                  • 作者: 馬雪兵,余地華,鄭剛,等
                                  論文摘要

                                  前排傾斜雙排樁支護性狀有限元分析*

                                  馬雪兵1,余地華1,鄭剛2,賴國梁1,葉建1,黃曉程1,程雪松

                                  (1.中建三局集團有限公司工程總承包公司,湖北 武漢 430064;2.天津大學土木工程系,天津 300072)

                                  [摘要]利用有限元軟件,針對傾斜雙排樁組合形式、前排傾斜雙排樁前樁材質與傾角、坑內留土高度與寬度等參數,分析其對傾斜雙排樁支護效果的影響,得出一些關于前排傾斜雙排樁性狀的結論:在傾斜雙排樁的組合形式中,后樁垂直前樁外傾雙排樁的支護效果較為理想,在綜合考慮造價與施工空間后,可作為最優傾斜雙排樁組合形式;前排傾斜雙排樁前樁樁身彎矩反彎點在0.5L~0.6L深度處,反彎點以上樁身后側受拉,反彎點以下樁身前側受拉;開挖較深時,前排傾斜樁采用鋼管混凝土樁(勁性結構)與混凝土樁較為理想;整體位移隨前樁傾斜角度增大逐步減小并收斂,且在傾角逐步增大時樁身彎矩逐步減小,主要因角度增大后前排樁除抗彎外,還提供了支撐作用;前排樁樁身最大位移隨留土高度與寬度的增加呈現二次函數減小,彎矩隨留土高度與寬度增加呈現線性減小。

                                  [關鍵詞] 基坑;支護;雙排樁;傾斜樁;位移;有限元分析

                                  [中圖分類號]TU753   [文獻標識碼]A           [文章編號] 1002-8498(2021)07-0001-05

                                  Finite Element Analysis of Supporting Behavior About Front Row Inclined of Double-row Piles

                                  MA Xuebing1, YU Dihua1, ZHENG Gang2, LAI Guoliang1, YE Jian1, HUANG Xiaocheng1, CHENG Xuesong2

                                  (1.General Construction Company of CCTEB Group Co., Ltd., Wuhan,Hubei 430064, China;2.Department of Civil Engineering, Tianjin University,Tianjin 300072, China)

                                  Abstract: In this paper, the finite element software is used to analyze the influence of the inclined double-row pile combination, the material and inclination angle of the pile in front of the inclined double-row pile, the height and width of the soil in the pit, and the effect on the supporting effect of the inclined double-row pile. Some conclusions about the behavior of the front row inclined of double row piles are obtained. In the combination of inclined double-row piles, the supporting effect of the double piles of rear pile vertical and front pile inclined is ideal, after considering the cost and construction space comprehensively, it can be used as the optimal inclined double-row pile combination. The zero point of bending moment of front row inclined of double row pile is at 0.5L~0.6L, below the excavation surface, above the zero point of bending moment the back side of the pile is pulled, follow the zero point of bending moment front side of the pile is pulled. When the excavation is deep, the front row inclined piles are ideal for the use of concrete-filled steel tubular piles (rigid structures) and concrete piles. The overall displacement gradually decreases and converges with the increase of the inclination angle of the front pile, and the bending moment of the pile body gradually decreases as the inclination angle increases gradually. The angle of the front row pile provides a supporting effect in addition to the bending resistance. The maximum displacement of the pile in the front row decreases as quadratic function with the increase of the height and width of the soil, and the bending moment decreases linearly with the increase of the soil height and width.

                                  Keywords:foundation excavation; supports; double-row piles; inclined pile; displacement; finite element analysis

                                  *中建股份2020年本級科技研發課題:基坑工程無支撐節約型支護技術(CSCEC-2020-Z-34

                                  [作者簡介] 馬雪兵,高級工程師,E-mail:191498910@qq.com

                                  主辦單位:亞太建設科技信息研究院有限公司 中國建筑集團有限公司 中國土木工程學會    承辦單位:施工技術傳媒機構
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