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    黃雪峰^1,2，  張建華¹，  馬良榮³，  朱勃霖⁴，  邱  爽¹
    （1 蘭州理工大學(xué)土木工程學(xué)院，蘭州730050；2 解放軍后勤工程學(xué)院軍事建筑工程系，重慶400041；3 寧夏電力設(shè)計(jì)院，銀川750000；4 蘭州大學(xué)資源環(huán)境學(xué)院，蘭州730000）

[摘要] 通過(guò)對(duì)濕陷性黃土大直徑旋挖嵌巖灌注樁靜載荷試驗(yàn)和樁身應(yīng)力測(cè)試，對(duì)其樁身內(nèi)力、荷載傳遞、側(cè)阻力、端阻力及樁端阻力與樁側(cè)阻力的相互關(guān)系等內(nèi)容進(jìn)行了試驗(yàn)研究。分析表明：1）良好的嵌巖樁樁巖膠結(jié)狀況對(duì)嵌巖段和上覆土層樁側(cè)阻力的發(fā)揮有較大影響；2）樁端承載性狀對(duì)樁側(cè)阻力強(qiáng)化效應(yīng)發(fā)生的前提條件是樁端阻力承擔(dān)一定的荷載，強(qiáng)化效應(yīng)一般可使樁側(cè)阻力提高20%~ 50%；3）樁端阻力對(duì)樁側(cè)阻力的強(qiáng)化效應(yīng)不僅表現(xiàn)在樁端附近，在樁身上部土層中也有強(qiáng)化效應(yīng)現(xiàn)象。上述關(guān)系可以提高嵌巖樁樁側(cè)阻力及單樁承載力，進(jìn)一步進(jìn)行樁基進(jìn)行優(yōu)化設(shè)計(jì)。
[關(guān)鍵詞] 嵌巖樁；載荷試驗(yàn)；側(cè)阻力；端阻力；強(qiáng)化效應(yīng)
中圖分類(lèi)號(hào)：TU473.1    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X( 2011) S2-0351-05

Research on strengthening effect of rock-socketed characters of cast in place pile on shaft resistance for collapsible loess
Huang Xuefeng^1,2,  Zhang Jianhua¹,  Ma Liangrong³,  Zliu Bolin⁴,  Qiu Shuang¹
(1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 400041, China; 3 Ningxia Electric Power Design Institute, Yinchuan 750000, China; 4 College of Earth and Environment Science, Lanzhou University, Lanzhou 730000, China)

Abstract: This paper presents the test research on characteristic of intemal force of pile, the load transfer behaviors, tip resistance, shaft resistance, and the relationship between the shaft resistance and the tip resistance, by the pile load test and axial stress tests oflarge diameter bored cast-in-place rock-socket pile in collapsible loess. Analysis suggests: 1) good pile-rock cementation status greatly influences the upper pile side and rock-socket section shaft resistance; 2) the shaft resistance strengthening effect of pile bearing performance( bearing behavior of pile)  is based on the function of tip resistance, and strengthening effect will generally play shaft resistance increased by 20%~50%;3)the shaft resistance strengthening effect of tip resistance is shown not only nearby the pile tip, but also in the soil about the upside of pile. The relationship above can improve the side resistance of rock-socketed pile and load-bearing capability of each pile, and it is helpful to optimize the design of pile.
Keywords: rock-socket pile; pile load test; shaft resistance; tip resistance; strengthening effect