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(1 北京科技大學(xué)土木與環(huán)境工程學(xué)院，北京 100083； 2 燕山大學(xué)建筑工程與力學(xué)學(xué)院，秦皇島 066004；3 秦皇島燕盛巖土有限公司，秦皇島 066000)

［摘要］為了研究深基坑樁錨支護(hù)結(jié)構(gòu)中錨桿的內(nèi)力與變形的影響因素，采用理論推導(dǎo)、現(xiàn)場試驗(yàn)與數(shù)值模擬相對(duì)比的方法。運(yùn)用半無限邊界上一點(diǎn)作用垂直力的布辛涅斯克(Boussinesq)問題的位移解，推導(dǎo)出錨桿錨固段的軸力分布的公式。運(yùn)用有限差分法，采用巖土軟件FLAC3D建立深基坑樁錨支護(hù)結(jié)構(gòu)的仿真模型，并對(duì)支護(hù)結(jié)構(gòu)中錨桿的內(nèi)力與變形進(jìn)行數(shù)值模擬。分析結(jié)果表明：理論計(jì)算、現(xiàn)場試驗(yàn)與數(shù)值模擬得到的結(jié)果基本吻合，表明由布辛涅斯克問題推導(dǎo)出錨桿錨固段軸力分布函數(shù)是正確的，為錨桿的計(jì)算提供了一種理論依據(jù)；用FLAC3D數(shù)值模擬深基坑支護(hù)結(jié)構(gòu)中錨桿的內(nèi)力與變形是可行的。在錨桿的張拉過程中，錨桿在自由段的軸力和變形量最大，從錨固段開始，錨桿的軸力和變形量逐漸減小，最后趨于零。

［關(guān)鍵詞］錨桿；試驗(yàn)；數(shù)值模擬；軸力

中圖分類號(hào)：TU753.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)08-0134-04

Study on distribution of axial force in prestressed anchor for deep foundation pit

Wu Chongfu^1，2，Li Changhong¹，Bi Xin²，F(xiàn)eng Qingbo³(1 School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China;2 School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004，China;3 Qinhuangdao Yansheng Geotechnical Engineering Co., Ltd., Qinhuangdao 066000，China)

Abstract:In order to study the influencing factors about internal forces and deformations of anchor in deep foundation pit, the theoretical derivation, field experiment and numerical simulation were carried out. Using Boussinesq solution on the semi-infinite boundary of vertical point force, a function was deduced for anchor axial force distribution. By using the finite difference method FLAC3D, simulation model of deep foundation pit was established, and internal force and deformation of bracing structure were calculated. The results show that the theoretical calculation, the field experiment and numerical simulation results are agreed with each other basically. The upper deduced function about anchor axial force distribution is correct, which provides a theoretical basis for calculating relative forces. It is feasible for using FLAC3D to simulate the anchor force and deformation of deep foundation pit bracing structure. In the process of the anchor bolt, the axial force and deformation on free part are large. Meanwhile, axial force and deformation decrease gradually along anchored length, and reduce to zero finally.

Keywords:anchor; experiment; numerical simulation; axial force

*河北省建設(shè)廳研究項(xiàng)目資助（2010\|221）。

作者簡介：武崇福，碩士，副教授，Email：wcf11@263.net。

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