预应力锚索对大跨度扁平地下洞库开挖稳定的影响研究
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摘要
为研究预应力锚索对大跨地下工程开挖稳定的影响,以大跨度扁平地下洞库开挖稳定为例,采用数值模拟的方法对锚索预应力值和间距两个因素进行分析研究,获得不同锚索预应力值和间距下地下工程的拱顶位移、衬砌最大主应力的分布规律,结果表明:随着锚索预应力值的增加,拱顶位移、衬砌最大主应力在逐渐降低,而锚索最大应力呈现先增加后减小的趋势;随着锚索间距的增加,拱顶位移、衬砌最大主应力在逐渐升高,而锚索最大应力同样呈现先增加后减小的趋势;建议锚索预应力值取200 t、间距取5 m较为适宜。
In order to analyze the effect of prestressed cable on the excavation stability of super-span underground engineering, taking a large span underground engineering as the example, the prestress value and space of prestressed cable were analyzed by numerical simulation. The principle of vault displacement and liner maximum principal stress under different prestress value and space of prestressed cable were obtained. The results show that with the increase of the anchor cable prestress the vault displacement and liner maximum principal stress decrease gradually, however, the maximum stress of the anchor cable shows a trend of increasing at first and then decreasing. With the increase of the space of anchor cable, the vault displacement and liner maximum principal stress increase gradually, the maximum stress of the anchor cable shows a trend of increasing at first and then decreasing. It is recommended that the prestress value of the anchor cable should be 200 tons and the space should be 5 m.
In order to analyze the effect of prestressed cable on the excavation stability of super-span underground engineering, taking a large span underground engineering as the example, the prestress value and space of prestressed cable were analyzed by numerical simulation. The principle of vault displacement and liner maximum principal stress under different prestress value and space of prestressed cable were obtained. The results show that with the increase of the anchor cable prestress the vault displacement and liner maximum principal stress decrease gradually, however, the maximum stress of the anchor cable shows a trend of increasing at first and then decreasing. With the increase of the space of anchor cable, the vault displacement and liner maximum principal stress increase gradually, the maximum stress of the anchor cable shows a trend of increasing at first and then decreasing. It is recommended that the prestress value of the anchor cable should be 200 tons and the space should be 5 m.
引文
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[2]SAGEFORSI,DAERGAP A.Anexcavationmethod for large vertical cylindrical caverns[J]. Tunneling and UndergroundSpace Technology,1996,11(3):279-285.
[3]孙博,胡功笠,刘新宇,等.大跨度洞库施工开挖稳定性研究[J].地下空间与工程学报,2005(5):689-692.
[4]肖从苗.深埋大跨地下工程稳定性研究[D].北京:北京交通大学,2016.
[5]李友华,黄应军,李景元.溪洛渡水电站左岸地下厂房大跨度高边墙开挖施工技术[J].水力发电,2008,34(9):9-14.
[6]王晓伟.龙滩水电站地下厂房大跨度高边墙开挖施工技术[J].广东科技,2009,221:267-268.
[7]刘保国,徐干成.大跨度高边墙地下洞室分层间隔施工方法[J].岩土力学,2011,32(9):2759-2764.
[8]杨明举,常艄东.超大型地下洞室群施工开挖程序及围岩稳定分析[J].西南交通大学学报,2000,35(1):32-35.
[9]赵奎银.大跨度高边墙地下工程施工技术[J].铁道建筑技术,2004(4):34-36.
[10]朱维申,李术才,陈锋.能量耗散模型在大型地下洞群施工顺序优化分析中的应用[J].岩土工程学报,2001,3(3):333-336.
[11]段建立,孙炎光,尤峻.特大跨度扁平洞室开挖施工离散元数值模拟[J].地下空间与工程学报,2013,9(Z2):1882-1885.