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根式基礎(chǔ)水平承載性能試驗(yàn)研究
龔維明1,王磊1,殷永高2,童小東1
摘 要

 

龔維明1,王磊1,殷永高2,童小東1
(1 東南大學(xué)土木工程學(xué)院, 南京 210096; 2 安徽省高速公路總公司, 合肥 230051)
 
[摘要]為了研究根式基礎(chǔ)的水平承載性能,采用單向單循環(huán)慢速維持荷載法,在馬鞍山長江大橋施工現(xiàn)場(chǎng)開展了兩期根式基礎(chǔ)水平靜載試驗(yàn)。試驗(yàn)得到了普通沉井基礎(chǔ)和根式基礎(chǔ)的水平臨界荷載、水平極限荷載、水平荷載與水平位移關(guān)系、變形特性等成果。試驗(yàn)結(jié)果表明:根式基礎(chǔ)水平承載性能優(yōu)于普通沉井基礎(chǔ)。植入根鍵能顯著提高普通沉井基礎(chǔ)的水平承載力。與普通沉井基礎(chǔ)相比,根式基礎(chǔ)水平承載能力提高了近1倍;表層覆蓋土層對(duì)根式基礎(chǔ)水平承載能力影響較大,去除表層覆蓋土層后,根式基礎(chǔ)的水平臨界荷載和水平極限荷載分別提高了150%95%;根式基礎(chǔ)自身結(jié)構(gòu)的中上部是水平承載能力發(fā)揮的關(guān)鍵部位,當(dāng)深度超過一定范圍后,增加深度對(duì)提高水平承載力作用甚小。
[關(guān)鍵詞]根式基礎(chǔ); 水平靜載試驗(yàn); 水平承載力; 厚覆蓋軟土層
圖分類號(hào):TU473        文獻(xiàn)標(biāo)識(shí)碼:A        文章編號(hào):1002-848X(2013)19-0090-05
 
Experimental study on horizontal bearing capacity of root-caisson foundation
Gong Weiming1, Wang Lei1, Yin Yonggao2, Tong Xiaodong1
(1 School of Civil Engineering, Southeast University, Nanjing 210096, China; 2 Expressway Corporations of Anhui Province, Hefei 230051, China)
 
Abstract: In order to study the horizontal bearing capacity of root-caisson foundation, two-stage horizontal static load test of root-caisson foundation was carried out at the construction site of Maanshan Yangtze River Bridge, in which unidirectional-cyclic slow sustaining loading method was applied. Results of horizontal critical load, horizontal ultimate load, relationship between horizontal load and displacement, deformation mechanism were obtained of common caisson foundation and root-caisson foundation. Test results show that the value of horizontal bearing capacity of root-caisson foundation is one times larger than that of common caisson foundation. The existence of the rootstalks could improve the horizontal bearing capacity of common caisson foundation. Covering soil has great effect on horizontal bearing capacity of root-caisson foundation. The horizontal critical load and ultimate load could increase by 150% and 95% respectively without covering soil. The upper part of the root-caisson foundation structure is the key position to bear the horizontal loadings, so the effect is small to improve the horizontal bearing capacity through adding buried depth when the depth exceeds a certain range.
Keywords: root-caisson foundation; horizontal static load test; horizontal bearing capacity; thick covering soft soil layer
作者簡(jiǎn)介: 龔維明,博士,教授,博士生導(dǎo)師,Email: wmgong@seu.edu.cn
 
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9JGJ 1062003建筑基樁檢測(cè)技術(shù)規(guī)范[S. 北京:中國建筑工業(yè)出版社,2003.
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