考虑溶洞顶板自重时桩端持力岩层安全厚度计算方法
发布时间：2018-08-28 17:27
【摘要】：通过对溶洞顶板持力层模型的合理简化,进一步完善了已有研究成果的溶洞顶板持力层抗冲切、抗剪切厚度公式,考虑自重影响因素。提出了可以考虑有效宽度、自重等影响因素的单向板、双向板抗拉弯破坏溶洞顶板持力层厚度公式。该公式力学概念清晰,计算简便。进一步结合工程实际中各种参数的取值范围,按照常规抗冲切、抗剪切和抗拉弯破坏模式,得出一般情况下溶洞持力层顶板抗冲切、抗剪切净厚度大于2.5~3.5倍桩径和抗拉弯破坏顶板总厚度大于5.0~5.5倍桩径即可满足设计要求。该研究可供岩溶区桥梁桩基工程设计和施工参考。
[Abstract]:Through the reasonable simplification of the model of cavern roof bearing layer, the formula of anti-punching and shearing thickness of cavern roof bearing layer, which has been studied in the paper, is further improved, and the influence factors of self-weight are considered. A formula for the thickness of the bearing layer of a unidirectional plate and a bidirectional plate which can take into account the factors such as effective width and deadweight is put forward. The mechanical concept of the formula is clear and the calculation is simple. Combined with the range of various parameters in engineering practice, according to the conventional anti-punching, shearing and tensile bending failure modes, it is concluded that under general conditions, the anti-punching shear of the roof of the cavern bearing layer is obtained. The net shear thickness of the pile is more than 2.5 and the total thickness of the tensile bending failure roof is more than 5.5 times of the pile diameter, which can meet the design requirements. The research can be used as a reference for the design and construction of bridge pile foundation in karst area.
【作者单位】： 中铁第四勘察设计院集团有限公司;
【分类号】：TU473.1
本文编号：2210074
[Abstract]:Through the reasonable simplification of the model of cavern roof bearing layer, the formula of anti-punching and shearing thickness of cavern roof bearing layer, which has been studied in the paper, is further improved, and the influence factors of self-weight are considered. A formula for the thickness of the bearing layer of a unidirectional plate and a bidirectional plate which can take into account the factors such as effective width and deadweight is put forward. The mechanical concept of the formula is clear and the calculation is simple. Combined with the range of various parameters in engineering practice, according to the conventional anti-punching, shearing and tensile bending failure modes, it is concluded that under general conditions, the anti-punching shear of the roof of the cavern bearing layer is obtained. The net shear thickness of the pile is more than 2.5 and the total thickness of the tensile bending failure roof is more than 5.5 times of the pile diameter, which can meet the design requirements. The research can be used as a reference for the design and construction of bridge pile foundation in karst area.
【作者单位】： 中铁第四勘察设计院集团有限公司;
【分类号】：TU473.1
【相似文献】
相关期刊论文 前9条
1 李志宇;郭纯青;田月明;胡君春;田西昭;;集成多种方法的溶洞顶板稳定性评价[J];工程勘察;2014年02期
2 吴岳明;;椭圆形溶洞顶板挠度的简化分析方法[J];工程勘察;2005年05期
3 蒋冲;赵明华;曹文贵;刘小平;;基于模糊和突变理论的岩溶区桩端溶洞顶板稳定性分析方法研究[J];公路交通科技;2008年12期
4 符策简;;岩溶地区隐伏溶洞顶板稳定性及变形分析[J];岩土力学;2010年S2期
5 车平;黄宏伟;;相似理论在溶洞顶板稳定性数值分析中的应用[J];地下空间与工程学报;2007年04期
6 任鹏;吴野;;基于模糊理论的溶洞顶板稳定性分析方法研究[J];四川建筑;2012年06期
7 黎斌,范秋雁,秦凤荣;岩溶地区溶洞顶板稳定性分析[J];岩石力学与工程学报;2002年04期
8 潘岳;戚云松;李爱武;;关于“岩溶区嵌岩桩承载力及其下伏溶洞顶板安全厚度的研究”的讨论[J];岩土工程学报;2009年02期
9 ;[J];;年期
相关硕士学位论文 前2条
1 闫双斌;桩基荷载下溶洞顶板稳定性研究[D];中南大学;2013年
2 喻晓峰;桩基下溶洞顶板稳定性多因素模拟分析[D];广西大学;2007年
，本文编号：2210074
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2210074.html
