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一、前言先有结构物而后回填土形成的地下管道,称为埋管。埋管受力状态与隧洞衬砌受力状态有本质区别。由于结构物刚度通常远大于回填土刚度,因而埋管两侧土柱要产生一个附加沉陷。这一附加沉陷受到埋管顶部土柱的阻挡,给管顶土柱附加剪力,致使管顶所受压力大于管顶土柱重量。本世纪以前,人们对此缺乏认识,致使埋管大量破损。1922年,美国人马斯屯首先提出了这个概念,发表了计算埋管荷载
I. INTRODUCTION The underground pipeline formed by the former structure and then backfilled is called buried pipe. There is a fundamental difference between the stress state of the buried pipe and the stress state of the tunnel lining. Because the rigidity of the structure is usually much larger than the stiffness of the backfill, an additional subsidence occurs on the soil pillars on both sides of the buried pipe. This additional subsidence is blocked by the soil column at the top of the buried pipe, adding shear force to the soil column at the top of the pipe, causing the pressure at the top of the pipe to be greater than the weight of the soil column at the top of the pipe. Before this century, people lacked understanding of this, resulting in massive damage to the burial pipe. In 1922, American Maasun first proposed this concept and published the calculation of the buried pipe load.