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（1西安科技大學(xué)建筑與土木工程學(xué)院， 西安 710054; 2 陜西建工控股集團(tuán)有限公司， 西安 710054；3 信息產(chǎn)業(yè)部電子綜合勘察研究院， 西安 710054）

［摘要］為探究黃土地區(qū)復(fù)合土釘超深基坑適用性與受力特征，以陜西渭南某復(fù)合土釘超深基坑工程為背景，依據(jù)現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)，判斷復(fù)合土釘應(yīng)用于黃土深基坑的支護(hù)效果，探究支護(hù)結(jié)構(gòu)受力規(guī)律； 基于數(shù)值模擬手段，對(duì)比純土釘與復(fù)合土釘受力變形差異，并提出相應(yīng)優(yōu)化建議。結(jié)果表明：復(fù)合土釘能有效抑制黃土超深基坑變形，適用性良好； 土釘最大軸力點(diǎn)位置隨著基坑開挖向土釘尾部移動(dòng)，因此可依據(jù)土釘軸力監(jiān)測(cè)判斷基坑安全性； 與純土釘支護(hù)結(jié)構(gòu)相比，復(fù)合土釘支護(hù)可降低土釘軸力52.3%，同時(shí)由于錨桿（索）限制了基坑水平位移作用，使得土釘最大軸力點(diǎn)位置前移，滑裂面規(guī)模減?。?由于基坑頂部土釘軸力較小，且基坑頂部水平位移量較小，土釘+錨索支護(hù)體系可優(yōu)化為仰斜式擋土墻+錨索支護(hù)，基坑上部支護(hù)能力未完全發(fā)揮，有一定優(yōu)化空間。所得結(jié)論可為復(fù)合土釘超深基坑支護(hù)結(jié)構(gòu)的應(yīng)用提供理論設(shè)計(jì)參考。

［關(guān)鍵詞］復(fù)合土釘； 超深基坑； 支護(hù)結(jié)構(gòu)； 錨索； 受力分析

中圖分類號(hào)：TU444文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)21-0126-07

Mechanical analysis and optimization suggestions of composite soil nail super-deep foundation pit support in loess area

ZHI Bin1, WU Lihele2, WANG Shengbo3, JIAO Hang1, WANG Shuai1

(1  School of Architecture and Civil Engineering, Xi′an University of Science and Technology, Xi′an 710054，China；2 Shaanxi Construction Engineering Holding Group Co., Ltd., Xi′an 710054，China； 3 Ministry of Information Industry Electronics Comprehensive Survey Research Institute, Xi′an 710054，China)

Abstract:In order to explore the applicability and mechanical characteristics of composite soil nail super-deep foundation pits in  loess area, a composite soil-nailed super-deep foundation pit project in Weinan, Shaanxi was used as a background, and based on field measured data, It was judged that the supporting effect of composite soil nail used in loess deep foundation pits, and the force law of supporting structure was explored. Based on the numerical simulation method, the difference between the force and deformation of pure soil nail and composite soil nail was compared, and corresponding optimization suggestions were put forward. The results show that composite soil nail can effectively restrain the deformation of super-deep foundation pits in loess area, and have good applicability; the position of the maximum axial force point of soil nails moves to the tail of the soil nail along with the excavation of the foundation pit, so the safety of the foundation pit can be judged based on the monitoring of the axial force of soil nails; compared with the pure soil nail support structure, the composite soil nail support can reduce the soil nail axial force by 52.3%, and at the same time, because the anchor rod (cable) restricts the horizontal displacement of the foundation pit, the position of the maximum axial force point of the soil nail is moved forward and the scale of the sliding surface is reduced; due to the small axial force of the soil nails on the top of the foundation pit and the small horizontal displacement of the top of the foundation pit, the soil nail + anchor cable support system can be optimized as an inclined retaining wall + anchor cable support, and the supporting capacity of the upper part of the foundation pit has not been fully utilized, and there is certain space for optimization. It can provide theoretical design reference for the application of composite soil nailing super-deep foundation pit supporting structure.

Keywords:composite soil nail; super-deep foundation pit; support structure; anchor cable; mechanical analysis

*陜西省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2018SF-397）。

作者簡介：郅彬，博士，副教授，Email:xianzhibin@163.com； 通信作者：武李和樂，碩士，Email:sdaaddeff520@qq.com。