| 非对称荷载单层对撑基坑计算方法研究 |
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| 引用本文： | 阮升,金亚兵,徐晶鑫,孙勇.非对称荷载单层对撑基坑计算方法研究[J].岩土力学,2022,43(8):2296-2304. |
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| 作者姓名： | 阮升 金亚兵 徐晶鑫 孙勇 |
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| 作者单位： | 1. 贵州大学 喀斯特环境与地质灾害教育部重点实验室，贵州 贵阳 550033；
2. 贵州大学 资源与环境工程学院，贵州 贵阳550033；3. 深圳市地质局，广东 深圳 518023 |
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| 基金项目： | 广东省深圳市地质局地质工程院士工作站专项经费资助项目（No. 2013B090400025） |
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| 摘 要： | 支护桩（墙）加内支撑作为基坑支护的一种重要型式，已经被基坑支护工程广泛采用。但是，由于基坑所处地质条件、周围环境和土方开挖的复杂性，给基坑支护体系的精准设计计算带来障碍。对非对称荷载作用下的单层内支撑支护设计计算方法进行了探讨。首先，基于极限土压力法分析了单层内支撑与支护桩支点铰接和固结条件下的不动点调整系数的差异性；其次，利用杆系有限单元法分析了基于位移土压力和基于《规程》给出的主动土压力这两种土压力方法计算的桩身位移、弯矩和剪力的差异性。由于非对称荷载作用于基坑支护体系，引起荷载大小侧支护桩桩身位移不同，导致荷载大小侧支护桩受到的土压力也不同，大小侧支护桩桩身内力存在较大差异现象应引起重视。提出的不动点调整系数计算方法和位移土压力计算支护桩受到的土压力计算方法更为合理。
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| 关 键 词： | 非对称荷载 对撑 不动点调整系数 极限土压力 位移土压力 杆系有限单元法 |
| 收稿时间： | 2021-10-21 |
| 修稿时间： | 2022-03-21 |
A calculation method of single-layer opposite
bracing foundation pit under asymmetric load |
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| RUAN Sheng,JIN Ya-bing,XU Jing-xin,SUN Yong.A calculation method of single-layer opposite
bracing foundation pit under asymmetric load[J].Rock and Soil Mechanics,2022,43(8):2296-2304. |
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| Authors: | RUAN Sheng JIN Ya-bing XU Jing-xin SUN Yong |
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| Institution: | 1. Key Laboratory of Karst Environment and Geological Hazard Prevention of Ministry of Education, Guizhou University, Guiyang, Guizhou 550003, China;
2. College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550003, China;
3. Shenzhen Geology Bureau, Shenzhen, Guangdong 518023 China |
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| Abstract: | The retaining pile plus internal support structure has been widely used in foundation pit support engineering. Due to the complexity of geological condition, surrounding environment and earth excavation, however, it brings obstacles to the accurate design and calculation of foundation pit support system. This paper discusses the design and calculation method of single-layer internal support system under asymmetric load. Firstly, the difference of fixed point adjustment coefficient under articulated and fixed conditions between single-layer internal support and retaining pile is analyzed based on ultimate earth pressure method. Secondly, by using finite rod element method, the differences of pile shaft displacement, pile bending moment and pile shear estimated by two methods, i.e., earth pressure considering displacement by Terzaghi, and active earth pressure based on Chinese technical regulations for the support of building foundation pits. Due to the asymmetric load acting on the foundation pit support system, the displacement of the support piles on the side bearing large load and the side bearing small load are different, resulting in the different earth pressure on the support piles on the side bearing large load and the side bearing small load. The phenomenon of large difference in the internal force of the support pile shaft on the large and small sides should be paid attention to. The calculation methods of fixed point adjustment coefficient and displacement earth pressure proposed in this paper are more reasonable. |
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| Keywords: | asymmetric load opposite bracing fixed point adjustment coefficient limit earth pressure earth pressure considering displacement finite rod element method |
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