水利水电技术（中英文）

针对"荷载—结构物"模型,基于现场实测数据资料,在深埋隧道围岩轴对称假定前提下,基于渗流理论推导出施工期隧道开挖后围岩内水压力分布的解析解,研究远场稳定水头与远场稳定水头半径的相互关系,提出通过现场围岩地下水水压监测数据反推远场稳定水头和远场稳定水头半径的思路和方法。以引汉济渭工程越岭段隧道为例,根据施工期地下水的水压监测资料,分析了部分洞段隧道部位的初始水压力及隧道开挖后形成的稳定远场水头半径,得到衬砌结构外水荷载。结果表明:在隧道内只要测到某一围岩深度的水头值,就可以确定远场稳定水头与影响半径;洞段K77+993断面围岩深度14 m处压力水头为10.50 m,则远场稳定水头为39.65 m,影响半径43.65 m。研究成果能够为注浆和排水设计提供借鉴和参考。

For the load-structure model,the analytical solution for the internal water pressure distribution of the surrounding rock after tunneling during construction is deduced out according to seepage theory under the premise of the axisymmetric assumption on the surrounding rock of deeply buried tunnel on the basis of the relevant in situ measured data,and then the correlation between the stable far-field water-head and the radius of it is studied,thus the concept and method for inversing the stable far-field water-head and the radius of it through the monitoring data of the in situ groundwater pressure of surrounding rock are proposed.By taking the tunnel through the mountain-crossing section of Hanjiang-to-Weihe River Valley Water Diversion Project as the study case,the initial water pressures of a part of tunnel sections therein and the radiuses of the stable far-field water-heads formed after tunneling are analyzed in accordance with the monitoring data of the groundwater pressure during the construction,from which the external water load on the lining structure can be obtained. The results show that stable far-field water-heads and radiuses of influence can be calculated as long as water pressure of ceratain depth in the tunnel surrounding rock is measured. For example,the water head in the depth 14 m of the surrounding rock of the section K77 + 993 is 10. 50 m,therefore the stable farfield water head is 39. 65 m and the influnece radius is 43. 65 m. The relevant references can also be provide for the drainage design concerned.