| 深大基坑两级复合土钉支护现场测试研究 |
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| 引用本文： | 王贵和,贾苍琴,季荣生,吕建国,唐红霞.深大基坑两级复合土钉支护现场测试研究[J].岩土力学,2008,29(10):2823-2828. |
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| 作者姓名： | 王贵和 贾苍琴 季荣生 吕建国 唐红霞 |
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| 作者单位： | 中国地质大学,工程技术学院,北京,100083 |
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| 摘 要： | 结合北京国美商都深大基坑支护工程实践,介绍了砂卵石层中花管式土钉、普通土钉与预应力锚杆相结合的两级复合土钉支护技术的设计与施工方法.通过现场对土钉拉力、基坑位移和锚杆应力的测试与分析,较全面地研究了在砂卵石层中基坑两级复合土钉支护的工作性能.研究结果表明:坡面设置一定宽度的退台会引起"退台效应",进而导致土钉墙受力特征的改变;复合土钉支护中设置预应力锚杆可以很好地控制基坑水平变形,但受土钉墙面层刚度限制和锚杆承压板厚度偏小等因素影响,锚杆锁定后预应力损失很大;土钉的最大拉力作用点连线向上向下延伸后,与边坡的最危险滑动面接近.
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| 关 键 词： | 深大基坑 复合土钉支护 现场测试 退台效应 |
| 收稿时间： | 2007-04-10 |
Field testing study of deep and large foundation pit with two-step composite soil nailing |
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| WANG Gui-he,JIA Cang-qin,JI Rong-sheng,LU Jian-guo,TANG Hong-xia.Field testing study of deep and large foundation pit with two-step composite soil nailing[J].Rock and Soil Mechanics,2008,29(10):2823-2828. |
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| Authors: | WANG Gui-he JIA Cang-qin JI Rong-sheng LU Jian-guo TANG Hong-xia |
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| Institution: | School of Engineering and Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The design principle and construction method from the case of Gome Shoppingcity excavation project on two-step composite soil nailing combined with spline-pipe soil nail,general soil nail and prestressed anchor are presented.A field investigation,including tensile forces of soil nail,excavation displacements and anchor stresses,and comprehensive analyses of the results are addressed.The characteristics of two-step composite soil nailing of excavation in sand and gravel layer are further investigated.Owning ... |
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| Keywords: | deep and large foundation pit composite soil nailing field test backslide effect |
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