| 格形地连墙与软土相互作用的离心试验研究 |
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| 引用本文： | 周广柱,徐伟,陈宇.格形地连墙与软土相互作用的离心试验研究[J].岩土力学,2011,32(Z1):134-140. |
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| 作者姓名： | 周广柱 徐伟 陈宇 |
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| 作者单位： | 同济大学地下建筑与工程系 |
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| 基金项目： | 上海市科学技术委员会科研计划项目资助(No.08201201102) |
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| 摘 要： | 格形地下连续墙(GCRW)是一种常用于软土地区的基坑开挖的新型支护结构,该结构与软土的相互作用是必须深入研究的关键问题。结合背景工程,首先进行了格形地连墙模型的设计和试验方案的制定,通过离心模型试验模拟了分步开挖基坑时格形地连墙和软土的相互作用,并把测定结果与朗肯土压力进行了比较。试验结果表明,土压力基本上呈现线性变化特征,格形地连墙因基坑开挖引起的前墙内侧土压力而产生变形和位移;格形地连墙和格子内的土体作为一个整体在土压力的作用下保持平衡,受力特征与重力式支护结构相似。支护结构处于最不利状态时,主动区土压力介于朗肯静止土压力和主动土压力之间,而被动区土压力大于朗肯被动土压力,前墙没有倾覆是因为受到了隔墙拉力。
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| 关 键 词： | 格形地下连续墙 离心模型试验 软土 土压力 开挖 重力式支护结构 |
| 收稿时间： | 2011-01-07 |
Centrifugal model test study of interaction of gridding concrete retaining wall and soft soil |
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| ZHOU Guang-zhu,XU Wei,CHEN Yu.Centrifugal model test study of interaction of gridding concrete retaining wall and soft soil[J].Rock and Soil Mechanics,2011,32(Z1):134-140. |
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| Authors: | ZHOU Guang-zhu XU Wei CHEN Yu |
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| Institution: | Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Gridding concrete retaining wall(GCRW) is a new-type supporting structure usually used in excavation of foundation pit in soft soil region; and interaction between GCRW and soft soil is the key issue to be studied profoundly. Centrifugal model and test plan were made firstly by means of background engineering; then the interaction between GCRW model and soft soil was successfully simulated through centrifugal model test of step by step excavation; finally, we made a comparion between measured results of earth pressures and ones based on Rankine theory. The results show that nearly all of the earth pressures take on linear distribution characteristic increasing along depth; GCRW produces deformation and displacement because of earth pressue on the inside of front wall caused by excavation. GCRW and soft soil in the gridding as a whole keep balance under the action of earth pressues, of which the stressed characteristics are similar to those of gravity supporting structures. While this structure is in its most unfavorable conditions, the earth pressures in active region are between earth pressure at rest and active pressure; but those in passive region are bigger than passive earth pressures. One of the reasons that front wall doesn’t overturn is the pulling force from partition wall prevent the front wall from overturning |
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| Keywords: | gridding concrete retaining wall (GCRW) centrifugal model test soft soil earth pressure excavation gravity supporting structure |
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