内支撑基坑变形空间效应特性研究
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摘要
由于内支撑围护结构系统刚度在空间上的差异性,基坑的变形问题表现出三维特性。为了更好的对围护结构变形及周围土体沉降的空间特性进行研究,采用Plaxis 3D有限元模拟对空间效应主要影响参数进行分析。分析结果表明:开挖尺寸对围护结构的变形特性及空间效应有一定的影响。围护结构所处的深度对平面应变比(PSR)有一定的影响,越是靠近地表处,围护结构长边的平面应变比越容易达到稳定状态。地表沉降受其与围护结构的相对位置影响较大,在距离围护结构0.75H_e时,土体沉降较大且表现的空间效应最明显。
The deformations of retaining wall and soil show the three-dimensional(3 D)effects because of the difference of system stiffness corresponding to different positions. In order to analyse the deformation characteristics of the retaining wall and the soil, a series of finite element modeling were established to study the main influencing factors. Research results indicate that excavation size have a influence on the deformation characteristics of the retaining wall and soil. Plain strain ratio(PSR) have a relationship with the depth of retaining wall. The plain strain ratio is easy to reach a steady state near the surface. The surface settlement are greatly influenced by its relative position with retaining structure. Meanwhile, The surface settlement have the best obvious three-dimensional(3 D)effects with the relative distance of 0.75H_e(H_e is the excavation depth).
The deformations of retaining wall and soil show the three-dimensional(3 D)effects because of the difference of system stiffness corresponding to different positions. In order to analyse the deformation characteristics of the retaining wall and the soil, a series of finite element modeling were established to study the main influencing factors. Research results indicate that excavation size have a influence on the deformation characteristics of the retaining wall and soil. Plain strain ratio(PSR) have a relationship with the depth of retaining wall. The plain strain ratio is easy to reach a steady state near the surface. The surface settlement are greatly influenced by its relative position with retaining structure. Meanwhile, The surface settlement have the best obvious three-dimensional(3 D)effects with the relative distance of 0.75H_e(H_e is the excavation depth).
引文
[1] 赖冠宙,房营光,史宏彦. 深基坑排桩支护结构空间共同变形分析[J]. 岩土力学, 2007, 28(8):1749-1752.
[2] 许锡昌,陈善雄,徐海滨. 悬臂排桩支护结构空间变形分析[J].岩土力学,2006,27(2):184-188.
[3] 杨雪强,刘祖德,何世秀. 论深基坑支护的空间效应[J].岩土工程学报, 1998, 20(2):74-78.
[4] 俞建霖,龚晓南. 深基坑工程的空间性状分析[J].岩土工程学报, 1999, 21(1):21-25.
[5] 潘泓, 周陈发, 曹洪. 复合土钉墙的角部空间效应及变形性状分析[J]. 岩土力学, 2008, 29(2): 333-336.
[6] 吴志敏,屠毓敏. 土钉基坑支护的空间效应研究[J]. 岩土力学, 2007, 28(10): 2178-2182.
[7] 陆培毅,李绍忠,顾晓鲁. 基坑支护结构的空间分析[J]. 岩土力学, 2004, 25(1): 121-124.
[8] FOOK H L, KWET Y Y, KEVIN C N Q, et al. Effect of corners in strutted excavations: field monitoring and case histories[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124(4): 338-349.
[9] RICHARD J FINNO,J TANNER BLACKBURN, JILL F ROBOSKI. Three-Dimensional Effects for Supported Excavations in Clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(1): 30-36.
[10] JILL ROBOSKI, RICHARD J. FINNO. Distributions of ground movements parallel to deep excavations in clay[J]. Canadian Geotechnical Engineering, 2006, 43:43-58.
[11] 应宏伟,杨永文. 杭州深厚软黏土中某深大基坑的性状研[J].岩土工程学报,2011,33(11):1838-1846.
[12] Ou C Y, Chiou D C, Wu T S. Three-dimensional finite element analysis of deep excavations[J]. Journal of Geotechnical Engineering, 1996, 122(5): 337-345.
[2] 许锡昌,陈善雄,徐海滨. 悬臂排桩支护结构空间变形分析[J].岩土力学,2006,27(2):184-188.
[3] 杨雪强,刘祖德,何世秀. 论深基坑支护的空间效应[J].岩土工程学报, 1998, 20(2):74-78.
[4] 俞建霖,龚晓南. 深基坑工程的空间性状分析[J].岩土工程学报, 1999, 21(1):21-25.
[5] 潘泓, 周陈发, 曹洪. 复合土钉墙的角部空间效应及变形性状分析[J]. 岩土力学, 2008, 29(2): 333-336.
[6] 吴志敏,屠毓敏. 土钉基坑支护的空间效应研究[J]. 岩土力学, 2007, 28(10): 2178-2182.
[7] 陆培毅,李绍忠,顾晓鲁. 基坑支护结构的空间分析[J]. 岩土力学, 2004, 25(1): 121-124.
[8] FOOK H L, KWET Y Y, KEVIN C N Q, et al. Effect of corners in strutted excavations: field monitoring and case histories[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124(4): 338-349.
[9] RICHARD J FINNO,J TANNER BLACKBURN, JILL F ROBOSKI. Three-Dimensional Effects for Supported Excavations in Clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(1): 30-36.
[10] JILL ROBOSKI, RICHARD J. FINNO. Distributions of ground movements parallel to deep excavations in clay[J]. Canadian Geotechnical Engineering, 2006, 43:43-58.
[11] 应宏伟,杨永文. 杭州深厚软黏土中某深大基坑的性状研[J].岩土工程学报,2011,33(11):1838-1846.
[12] Ou C Y, Chiou D C, Wu T S. Three-dimensional finite element analysis of deep excavations[J]. Journal of Geotechnical Engineering, 1996, 122(5): 337-345.