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本文综述了我所71～78年来为葛洲坝水利枢纽第一期工程进行的基岩稳定性研究工作,其中包括,地应力对基坑岩体稳定性的影响,粘土岩软弱夹层,特别是泥化夹层的长期稳定性和长期强度。通过地应力实测,证实了即使在褶皱轻微、地形平缓的红色岩层中仍可能有较大的构造应力存在,它的局部释放会直接影响岩体稳定。并且有力地说明了构造运动作用是粘土岩泥化的主要原因之一。根据对粘土岩的物理化学和力学性质以及物质结构特性的研究,指出了在外力作用下,当其亚微观结构或微观结构受到破坏时,因粘土颗粒大量吸水膨胀而可能产生泥化。根据现场和室内的剪切蠕变和室内的剪切松弛以及扭转蠕变试验结果,指出了粘土质粉砂岩、砂岩、粘土岩软弱夹层均具有显著的流变特性,提出了确定长期强度的方法。
This paper summarizes the work on the stability of the bedrock for the first phase of the Gezhouba water conservancy project from 71 to 78 years ago, including the effect of in-situ stress on the stability of the rock mass in the foundation pit, the weak interlayer of clay rock, and in particular the quagmire The long-term stability and long-term strength of the sandwich. Through in-situ stress measurements, it was confirmed that even if there are still large tectonic stresses in the red rock formation with slight wrinkles and flat terrain, its local release will directly affect the stability of the rock mass. And it is a strong indication that tectonic movement is one of the main reasons for claystone mudification. According to the study of the physical and chemical properties of the clay rock and the physical properties of the material, it is pointed out that under the action of the external force, when the submicroscopic structure or the microstructure is damaged, the clay particles may produce argillization due to large water absorption and swelling. According to the on-site and indoor shear creep and indoor shear relaxation and torsion creep test results, it is pointed out that the clayey siltstone, sandstone, and clay-rock weak interlayer all have significant rheological properties, and a method for determining long-term strength is proposed. .