( 上海市政工程设计研究总院（集团）有限公司， 上海 200092)

［摘要］基于矩形盾构隧道的梁-弹簧模型计算法，对衬砌的外形、侧压力系数、接头刚度等计算参数对衬砌受力的影响进行了系统性分析。通过对矩形盾构法隧道不同计算模型的受力分析表明：随着拱顶起拱量的增加，衬砌的受力得到了改善；矩形隧道由于外形的特点，侧压力系数及地层抗力系数的变化对衬砌的受力影响较低，表现出与圆形盾构隧道不同的受力特性；随着管片接头刚度的提高，衬砌环在拱顶或拱底的弯矩在减少，而在拱腰部位的弯矩在增大。这些可为矩形盾构法隧道的设计提供基础性认识。

［关键词］矩形盾构法隧道； 衬砌外形； 侧压力系数； 转动刚度

中图分类号： TU398.7 文献标识码： A文章编号： 1002-848X(2015)S2-0069-06

 *上海市国资委企业技术创新和能级提升项目（201310）,上海市科学技术委员会科研计划项目（13XD1422900）。

通讯作者： 官林星，高级工程师，博士，Email:guanlinxing@smeid.com。

Mechanical analysis of large cross-section rectangular shield tunnel lining in soft ground

Sun Wei, Guan Linxing

（Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China）

Abstract: Based on the shell-spring model of rectangular shield tunnel, the relationship between the internal force of lining and the model parameters is systematically investigated. The parameters of model include the lining shape, lateral earth pressure coefficient, rigidity of joint. The mechanical analysis of many different calculation models shows the following conclusions. The internal force distribution of lining becomes better with the increase of span height. The coefficients of lateral earth pressure and ground spring affect the distribution of internal force very slightly due to the shape properties. The moment at the crown or invert of lining reduces and the moment at haunch increases with the increase of joint rigidity. The above can provide basic knowledge for design of the rectangular shield tunnel lining.

Keywords: rectangular shield tunnel; shape of lining; lateral earth pressure coefficient; joint rigidity