下穿铁路的承压引水隧洞设计  

Design of Compression Seepage Tunnel Underpass Railway

作　　者：陈赤坤[1] 杨建民[1] 潘鹏[1] 谭成中[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2007年第6期60-63,共4页Journal of Railway Engineering Society

摘　　要：研究目的:白水江三级电站引水隧洞最大水头高度42 m,下穿既有内昆铁路手扒岩隧道,距隧道边墙基底仅13.06 m,引水隧洞在施工中易引起铁路隧道下沉及衬砌破坏,为保证既有隧道运营安全,需采用合理的施工方法和衬砌型式。研究方法:利用3D-σ分析了引水隧洞对铁路隧道的影响,采用理论分析和ANSYS程序计算出衬砌内力,并分析爆破振动的影响。研究结果:确定控制衬砌型式的荷载组合,并对正常使用状态的裂缝进行了控制。研究结论:对于下穿铁路隧道的承压引水隧洞设计,首先要分析引水洞施工对铁路隧道的影响范围,合理地进行荷载组合,按基本组合进行承载能力极限状态检算,并采用标准组合进行正常使用极限状态的裂缝验算;对于承压引水隧洞,裂缝验算一般是配筋计算中的控制条件;引水隧洞的开挖引起铁路隧道周边的围岩变形位移小,内水压力是主要控制荷载,施工中应采用钢纤维喷射混凝土及时支护。Research purposes： The diversion tunnel in Baishuijiang three - level power station has a 42 m high maximum water head, underpassing the Shoupayan tunnel of the existing Neijiang - Kunming Railway, and is only 13.06 m apart from foundation base of the tunnel sidewall. In the construction process of the diversion tunnel it is easy to cause the railway tunnel settlement and the lining destruction. In order to guarantee the operation safety of existing tunnel, the rational construction methods and lining patterns should be adopted necessarily. Research methods：3D -cr is adopted for analyzing the influence of derivation tunnel on the railway tunnel. The theoretical analysis and internal force of lining which are calculated out by the ANSYS procedure are adopted to analyze the influence of blasting vibration. Research results：The load combination controlling lining pattern is determined and the crack under the normal use is controlled. Research conclusions： （ 1 ） For design of compression seepage tunnel underpass railway, the analysis should be made for the influenced area of railway tunnel by the construction of seepage tunnel, the composition should be made rationally for load, the verification should be made for the limitation status of load - bearing capacity with the basic composition and for the limitation status of crack with the standard composition. （2） The verification of crack is the control condition for calculation of distributed steel to seepage tunnel. （3） Steel fibre sprayed concrete should be used for support in construction because the pressure of internal water is the main control load due to less deformation and displacement of wall rock around railway tunnel caused by excavation of seepage tunnel.

关 键 词：荷载组合 内水压力 裂缝控制 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]