软岩隧道围岩压力的位移直接反演方法的研究  

STUDY ON REVERSE DISPLACEMENT METHOD OF GROUND PRESSURE FOR TUNNELS IN SOFT ROCK

作　　者：刘艳青[1] 卢汝绥[2] 

机构地区：[1]北方交通大学 [2]铁道部科学研究院

出　　处：《土木工程学报》2001年第1期84-87,共4页China Civil Engineering Journal

摘　　要：将软岩隧道的喷射混凝土支护做为拱形柔性整体结构物来考虑，根据共同变形理论，假定软岩隧道围岩压力沿支护结构的外表面连续分布，并可表述为在连续函数空间 Ｃ ［ａ， ｂ］上的一个函数ｆ∈Ｃ［ａ， ｂ］，在满足工程需要的精度下，用均方误差最小作为度量标准，用以勒让德（Ｌｅｇｅｎｄｒｅ）多项式为基函数的最佳平方逼近多项式近似逼近围岩压力的实际分布，并结合铁路隧道的支护结构空间尺寸上的特殊性，提出了一种基于隧道周边位移来直接求解围岩压力分布的十分简便的计算方法。A very simple method that calculates ground pressure directly based on displacements around a tunnel is proposed in the paper. The concrete cover of a soft rock tunnel is completed by a concrete gun. We consider the cover is worked together with the soft rock tunnel as an integral flexible ed. It is according to the theory of consistent deformation. The ground pressure of a soft rock tunnel is continue distributed along the outside of the cover. With the help of least mean square deviation, a simply analytical function is adopted to approach the actual distribution. An optimum square approximating based on legendre polynomial is obtained. The method is also suited to the special space size in the railway tunnel.

关 键 词：隧道 围岩压力 软岩 位移直接反演法 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]