盾构施工煤巷管片环间橡胶垫纵向变形性能研究

Study on longitudinal deformation properties of rubber pads between segment rings of coal mine roadway constructed by shield

针对目前国内外关于橡胶垫作用影响管片结构变形性能的研究较少的现状,文章分析了隧道采用盾构法施工过程中管片衬砌的受力相当复杂,既有环向荷载又有纵向荷载,这些荷载包括千斤顶压力、围岩及注浆压力等。利用基本力学分析方法,考虑千斤顶推力、管片环与井壁间的摩擦阻力、管片环与橡胶垫之间挤压力的作用,推导了单片橡胶垫的压缩变形量和总压缩变形量的解析式,明确了千斤顶推力对橡胶垫变形的影响规律。指出:管片环之间的橡胶垫在千斤顶的推力作用下,将产生一定的压缩变形量,该变形量会影响整个井筒的稳定性;管片环间的橡胶垫的压缩变形量和千斤顶的推力有关,也和管片外侧回填层注浆时间有关,当橡胶垫和千斤顶之间的距离达到一定数值以后,则不产生压缩变形;当盾构法施工技术参数变化时,受压缩的橡胶垫的个数也不同。

In view of the inadequate research on the effect of rubber pad on the deformation performance of the pipe structure at home and abroad,we analyze the complex stress of the pipe lining during tunnel construction using shield method,including circumferential load and longitudinal load from pressure of jack, surrounding rock and grouting.Considering the jack thrust,frictional resistance between segment ring and shaft lining and squeeze pressure between segment ring and rubber pad,basic mechanics analysis method is used to derive the analytical formula of the compression deformation of each rubber pad. The effect of the jack thrust on the deformation of the rubber pad is clarified. It is pointed out that the rubber pad between the segment rings will produce a certain compressive deformation under the jacking force of the jack,which will affect the stability of the whole shaft. The compressive deformation of the rubber pad between the segment rings is related to the jacking force,and to the grouting time of backfill layer,when the distance between the rubber pad and the jack reaches a certain value,it does not produce compression deformation; when the shield method of construction of technical parameters,the compressed rubber pad The number of different.