论文部分内容阅读
本文根据野外调查与隧道施工的资料,论证了在老黄土中存在构造斜节理,它们是构造地应力造成的,与岩石中的构造节理相似。文中对黄土某些构造斜节理的产状及其形成原因进行了力学分析,并对这些构造斜节理的节理面和因开挖洞室导致局部应力集中而产生的土体中破裂面的特征作了总结与对比。文中通过实例说明黄土中的这些构造斜节理构成了黄土中的软弱结构面,这些软弱结构面与地下洞室开挖的临空面可能将土体切割成不稳定结构体。这就成了坍方或影响洞室稳定性的主要原因。因此,在黄土地下工程设计及其施工中,不仅要应用土力学的基本原理与方法,而且还有必要应用岩体力学的基本原理与方法。
Based on field surveys and tunnel construction data, this paper demonstrates that there are tectonic oblique joints in the old loess, which are caused by tectonic stress and similar to structural joints in rocks. In this paper, the mechanical analysis of the occurrence and the formation causes of the inclined joints of some structures in loess are carried out. The joint surfaces of these structural joints and the characteristics of the fracture surface in the soil caused by the local stress concentration caused by the excavation of the caverns are analyzed. Summary and comparison. The examples illustrate that these structural oblique joints in loess constitute the weak structural planes in loess. These weak structural planes and the open voids of underground caverns may cut the soil into unstable structures. This has become the main reason for the instability or the stability of the cavern. Therefore, in the design and construction of loess land, not only the basic principles and methods of soil mechanics should be applied, but also the basic principles and methods of rock mechanics must be applied.