锚杆设计参数对拉锚式支护结构水平位移的影响
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摘要
利用FLAC3D商业软件对基坑工程拉锚式支护结构的锚杆设计参数(锚杆长度、锚杆倾角、锚杆刚度以及锚杆设置深度)对支护结构水平位移的影响进行了数值模拟。模拟结果揭示:随着锚杆长度增加,最大水平位移减小,锚杆长度控制在1.5～2.0倍开挖深度之间为宜;锚杆倾角在15～30°之间对最大水平位移的影响不大;锚杆刚度不宜过大,也不宜过小,刚度在18.75GPa左右比较合适;加单根锚杆时,锚杆设置深度越小越好,在距支护结构顶部1m左右比较适宜。
In this paper, effect of the dip angle, stiffness and design depth of bolt on the horizontal displacement of tension anchor supporting structure was carried out by FLAC3D. Numerical simulation results show that the dip angle of bolt doesn't influence on the maximum horizontal displacement when it is between 0° and 35°, and it is fit for being controlled 15°. The study also shows that the stiffness of bolt cannot be too large and too small, and it is more fitful when the stiffness reaches 75GPa, the design depth of bolt is increasingly smaller, what is more, it will be more fitful for about three meters near to the top of the supporting structure when adopting the single bolt.
In this paper, effect of the dip angle, stiffness and design depth of bolt on the horizontal displacement of tension anchor supporting structure was carried out by FLAC3D. Numerical simulation results show that the dip angle of bolt doesn't influence on the maximum horizontal displacement when it is between 0° and 35°, and it is fit for being controlled 15°. The study also shows that the stiffness of bolt cannot be too large and too small, and it is more fitful when the stiffness reaches 75GPa, the design depth of bolt is increasingly smaller, what is more, it will be more fitful for about three meters near to the top of the supporting structure when adopting the single bolt.
引文
[1] 唐业清,李启民,崔江余.基坑工程事故分析与处理[M].北京:中国建设工业出版社,1999.
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[3] 俞建霖,龚晓南.软土地基基坑开挖的三维性状分析[J].浙江大学学报,1998,32(5):552-557.
[4] 俞建霖,赵荣欣,龚晓南.软土地基基坑开挖地表沉降量的数值研究[J].浙江大学学报,1998,32(1):95-100.
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[7] 段绍伟,杜飞,沈蒲生.基坑深度、墙体长度、墙体插入深度对高层建筑深基坑开挖变形的影响[J].建筑结构,2002,32(7):27-28.
[8] 蒋克锋,赵燕明.单锚预应力支挡结构锚杆设置的相互作用[J].地下空间,2001,21(5):470-474.
[9] 龚晓南,高有潮.深基坑工程设计施工手册[M].北京:中国建设工业出版社,1998.
[2] 秦四海.深基坑工程优化设计[M].北京:地震出版社,1998.
[3] 俞建霖,龚晓南.软土地基基坑开挖的三维性状分析[J].浙江大学学报,1998,32(5):552-557.
[4] 俞建霖,赵荣欣,龚晓南.软土地基基坑开挖地表沉降量的数值研究[J].浙江大学学报,1998,32(1):95-100.
[5] 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.
[6] 俞建霖,龚晓南.基坑工程变形性状研究[J].土木工程学报,2002,35(4):86-90.
[7] 段绍伟,杜飞,沈蒲生.基坑深度、墙体长度、墙体插入深度对高层建筑深基坑开挖变形的影响[J].建筑结构,2002,32(7):27-28.
[8] 蒋克锋,赵燕明.单锚预应力支挡结构锚杆设置的相互作用[J].地下空间,2001,21(5):470-474.
[9] 龚晓南,高有潮.深基坑工程设计施工手册[M].北京:中国建设工业出版社,1998.
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