高水位區地下連續墻穿越粉砂層槽壁穩定性數值分析
  • 作者: 嚴朝鋒,張孟喜,周忠群
論文摘要

高水位區地下連續墻穿越粉砂層槽壁穩定性數值分析*

嚴朝鋒1,張孟喜2,周忠群2 

(1.中鐵二十局集團第一工程有限公司,江蘇 蘇州 215151; 2.上海大學力學與工程科學學院,上海 200444)

[摘要]依托蘇州春申湖路快速化改造工程湖中區段地下連續墻施工,通過采用有限元軟件對湖區地下連續墻成槽施工進行數值模擬,與實際地下連續墻施工中的超聲波檢測結果進行對比,從而分析高水位區穿越粉砂層槽壁變形特征和影響規律。研究表明:考慮承壓水作用時,粉砂層槽壁側向位移較大,易發生槽壁失穩破壞;考慮泥皮作用時,對粉砂層槽壁側向位移影響較小,但對粉砂層的塑性應變影響卻較為明顯;高地下水位對粉砂層穩定性影響較大,從粉砂層的抗剪強度考慮,內摩擦角和黏聚力對粉砂層穩定性均有重要影響,但內摩擦角影響程度較黏聚力大。

[關鍵詞]地下工程;地下連續墻;承壓水;槽壁側向位移;超聲波檢測;有限元分析

[中圖分類號]TU753    [文獻標識碼]A    [文章編號]1002-8498(2021)18-0051-06

Numerical Analysis of the Stability of Diaphragm Wall Crossing Silty Sand in High Water Area

YAN Chaofeng1, ZHANG Mengxi2, ZHOU Zhongqun2 

(1.China Railway 20th Bureau Group First Engineering Co., Ltd., Suzhou, Jiangsu 215151, China; 2.School of Mechanics and Engineering Sciences,Shanghai University, Shanghai 200444, China)

Abstract:Relying on diaphragm wall in lake constriction of Suzhou Chunshenhu Road rapid transformation project, the finite element software is adopted to numerically simulate the construction. Combining the actual diaphragm wall, the ultrasonic detection figure and calculated values are compared to analyze deformation characteristics and the influence law under high water area crossing through the powder sand slurry.The results show that firstly, when the effect of artesian water is considered, the silt trench wall moves more laterally, and the trench wall is prone to instability and failure. Secondly, when considering the effect of mud crust, it has little effect on the lateral movement of silt layer, but more obvious effect on the plastic strain of silt layer. Thirdly, high groundwater level has great influence on the stability of silt layer. Considering the shear strength of silt layer, the internal friction angle and cohesion have important influence on the stability of silt layer, but the influence of internal friction angle is greater than cohesion.

Keywords:underground;diaphragm wall;artesian water;lateral displacement of trench;ultrasonic testing;finite element analysis

* 中鐵二十局科研立項:復雜地質超深地下連續墻施工防坍技術研究(YF1901SD048

[作者簡介]嚴朝鋒,高級工程師,Email:596004281@qq.com

 

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