风积沙隧道围岩压力分布特征及衬砌结构强度验算分析  

Study on Distribution of Rock Pressure and Lining Structural Strength for Aeolian Sand Tunnel

作　　者：史宝童[1] 赵佳云 谢祥光[1] 张晓旭[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075 [2]中交一公局厦门工程有限公司

出　　处：《公路》2013年第6期270-276,共7页Highway

摘　　要：风积沙地层结构松散、级配不良、黏聚力低,几乎无自稳能力,地层压力主要表现为松散围岩压力,这些独特的特点给隧道的设计和施工带来了极大地困难。针对风积沙地层的物理特性,通过对国内外各种常用围岩压力计算理论的优缺点和适用条件的分析,结合现场围岩压力监测结果,总结了超浅埋、浅埋、深埋风积沙隧道的分界标准及相应的围岩压力计算公式,并就隧道在沙层荷载作用下拱部脱离区的范围及衬砌结构轴力、弯矩、偏心距的分布特征进行了详细分析。The aeolian sand layer is lack of self-stability with bad gradation and loose structure as well as low cohesion strength. Ground pressure mainly expresses as loose surrounding rock pressure. These characteristics cause huge difficulty for tunnel＇s design and construction. According to the physical charac- teristics of aeolian sand formation, advantages and disadvantages along with applicable conditions of main calculating method of surrounding rock pressure have been analyzed comprehensively. Based on monitoring result of surrounding rock pressure, the delimitation standard and corresponding calculating method comes up for surrounding rock pressure in super shallow buried tunnel, shallow buried tunnel and deep tunnel located in aeolian sand area. Under sand layer load action, distribution of the arch detachment range, axial force, bending moment and eccentricity have been analyzed in detail.

关 键 词：风积沙隧道 围岩压力 结构强度 弹性抗力 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]