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 (銅陵學(xué)院建筑工程學(xué)院， 銅陵 244000)

［摘要］借助離心模型試驗(yàn)和室內(nèi)模型試驗(yàn)，對(duì)影響基坑抗突涌穩(wěn)定性的隔水層性質(zhì)、樁類型及平面布置、基坑平面尺寸等因素進(jìn)行了系統(tǒng)研究。研究結(jié)果表明：上海地區(qū)的灰色淤泥質(zhì)黏土隔水層易發(fā)生整體頂升破壞，暗綠色粉質(zhì)黏土隔水層發(fā)生表面砂沸破壞的概率較大；基坑內(nèi)存在樁時(shí)，基坑主要發(fā)生接觸面涌水、涌砂破壞；在保證灌注樁施工質(zhì)量以及預(yù)制樁與周圍土體充分固結(jié)的情況下，樁對(duì)基坑抗突涌穩(wěn)定性具有積極的作用；同時(shí)基坑平面尺寸對(duì)基坑抗突涌穩(wěn)定性也具有明顯作用。

［關(guān)鍵詞］軟土地區(qū); 基坑; 突涌; 隔水層性質(zhì); 基坑平面尺度

中圖分類號(hào)：TU447，TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2014)03-0090-03

Experimental study of influential factors on bursting failure of foundation pit in soft soil area

Xiao Hongju, Sun Yuyong

(College of Civil Engineering, Tongling University, Tongling 244000, China)

Abstract: According to results of centrifugal model tests and indoors model tests, influential factors on anti-bursting stability of foundation pit were systematically investigated, including aquiclude properties, pile types and layouts, plane size of foundation fit etc. Results show that the mainly failure modes of the fourth and the sixth aquiclude, in Shanghai are overall heaving and surface boiling respectively. Water and sand inrush happen on contact surface between soil and underground structures when piles exist in foundation pit. Piles contribute to anti-bursting stability when cast-in-place piles and prefabricated pile have well contact strength. Foundation size has a significant effect on the anti-bursting stability.

Keywords: foundation pit in soft soil area; bursting; aquiclude property; plane size of foundation pit

*安徽省自然科學(xué)基金（1208085QE96），安徽省級(jí)優(yōu)秀青年人才基金項(xiàng)目(2012SQRL192ZD)。

作者簡(jiǎn)介：肖紅菊，碩士，Email：xiaohongju@126.com。

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