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（1 中國建筑科學(xué)研究院， 北京 100013； 2 臨汾市建筑勘察設(shè)計(jì)院， 臨汾 041000）

［摘要］為了研究長螺旋鉆孔壓灌混凝土工藝制成的抗壓樁與無自由段復(fù)合錨桿的極限承載力、軸力、側(cè)摩阻力的分布規(guī)律以及兩者之間的聯(lián)系，在現(xiàn)場(chǎng)進(jìn)行了兩組足尺試驗(yàn)；通過在抗壓樁和復(fù)合錨桿內(nèi)設(shè)置鋼筋計(jì)，測(cè)出各級(jí)荷載下樁身/桿身不同深度的應(yīng)變，推算出其軸力和側(cè)摩阻力，進(jìn)而對(duì)抗壓樁和復(fù)合錨桿的受力機(jī)理進(jìn)行了分析。分析結(jié)果表明，抗壓樁和復(fù)合錨桿的側(cè)摩阻力都是從上部開始發(fā)揮并向下部傳遞的，其中抗壓樁樁端阻力對(duì)樁側(cè)摩阻力表現(xiàn)出強(qiáng)化效應(yīng)；復(fù)合錨桿的受力模式不同于普通的抗拔樁和抗浮錨桿，試驗(yàn)中桿身軸力峰值與張拉極限荷載的比值約為2/3。最后根據(jù)試驗(yàn)分析結(jié)果和《建筑樁基技術(shù)規(guī)范》（JGJ 94—2008），提出了長螺旋鉆孔壓灌混凝土工藝下復(fù)合錨桿極限承載力的估算方法。

［關(guān)鍵詞］抗壓樁； 復(fù)合錨桿； 極限承載力； 軸力； 側(cè)摩阻力

中圖分類號(hào)：TU476文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)11-0109-05

Experimental study on bearing properties of compression and uplift components with long spiral drilled compression grouting concrete

Hua Penglin1, An Yiqing2

(1 China Academy of Building Research, Beijing 100013, China; 2 Linfen City Architectural Survey and Design Institute, Linfen 041000, China)

Abstract:In order to study the distribution laws of ultimate bearing capacity, axial force, side friction resistance and the connection between compression piles and free-section composite anchors made by long spiral drilled compression grouting concrete technology process. Two full-scale tests were conducted in the field. By setting the steel bar gauges in the compression piles and composite bolts, the strains at different depths of the pile/shaft under different loads were measured, and its axial force and side friction resistance were calculated. And then the stress mechanism against the compression pile and composite anchor were analyzed. The analysis results show that the lateral frictional resistance of the compression pile and the composite anchor are both transmitted from the upper part to the lower part, and the pile end resistance of the compression anchor shows the strengthening effect on the pile side resistance; the force pattern of the composite anchor is unlike the ordinary uplift piles and anti-float anchors. The ratio of the axial peak force of the shaft to the tensile limit load is approximately 2/3. Finally, according to the experimental analysis results and Technical code for building pile foundations (JGJ 94—2008), the method for estimating the ultimate bearing capacity of composite anchor under the process of long spiral drilled compression grouting concrete technology was put forward.

Keywords:compression pile; composite anchor; ultimate bearing capacity; axial force; lateral friction

作者簡介：滑鵬林，碩士，助理工程師，Email：825756363@qq.com。