黄土地区公路暗穴顶板临界厚度的确定方法

针对西部黄土地区暗穴的发育会对公路路基、桥涵、公路隧道、路堑与路堤边坡及边坡支挡工程等的稳定性造成严重威胁的问题,在野外调查的基础上,对暗穴的分布规律、发育形态、破坏机制等进行了归纳与研究,提炼出几种破坏模式,结合黄土地区的土质特点,考虑了节理对黄土暗穴的影响,采用结构力学等方法,提出了一些确定顶板临界厚度的方法,并进行了对比讨论。通过对路基暗穴的安全厚度的正确估算,为研究公路暗穴有效防治措施提供了可靠的依据。

Methods on Defining Critical Thickness of Hidden Cave''''s Roof of Highway in Loess Area

Based on the problem that the stability of the highway roadbed,bridges,tunnels and the side slope are seriously threatened with the development of the hidden caves in the western loess area,according to the field inquire,the distribution,the developed configuration and the breakage mechanism of hidden caves were concluded and researched,and several destroy patterns were abstracted.By taking into account the character of the loess area and the influence of joint on loess hidden cave,and by using structural mechanics method,several methods defining the critical thickness of the roof were proposed,and they were compared and discussed.If the critical thickness of the hidden caves was estimated,then,the effective prevention measures and cure methods for researching the hidden caves could be gotten.