论文部分内容阅读
本文论述了乌江渡工程右坝肩复合滑动面的试验研究。 复合滑动面的剪切特性试验是研究复合滑动面上组合岩性的抗剪强度的一种重要手段。 复合滑动面上的剪切特性主要受组合岩性所控制,当滑动面上岩性是以坚硬岩石为控制时(坚硬岩石比例超过60％以上),滑动面的剪切特性主要呈脆性破坏形式;当复合滑动面是以软弱岩石为控制时(软弱岩石比例超过60％以上),呈塑性破坏形式,破坏时强度较低而变形很大。 复合滑动面上的剪切特性规律是复杂的。复合滑动面上抗剪强度因组成岩性比例不同而异,应力分布也因岩性不同而出现或大或小的应力集中现象。因此,在选择复合滑动面的剪切特性参数,按照岩性所占比例进行加权平均取值时,当坚硬岩石所占比例超过60％以上的是合适的,而在软弱岩石(软岩比例超过60％)所控制的复合滑动面上取加权平均值则是不合理的,而且是危险的。 复合滑动面上剪切特性参数选择用加权平均法取值有一定的合理性,但试验数据的选择则有一定的任意性。应当力求通过试验研究找到具有一定科学性和比较准确可靠的方法以应用于工程设计。
This paper discusses the experimental study on the composite sliding surface of the right abutment of Wujiangdu Project. Shear test of composite sliding surface is an important means to study the shear strength of composite lithology. The shear characteristics of the composite sliding surface are mainly controlled by the composite lithology. When the lithology of the sliding surface is controlled by hard rock (the proportion of hard rock exceeds 60%), the shear characteristics of the sliding surface are mainly in the form of brittle failure When the composite sliding surface is controlled by weak rock (the proportion of soft rock is more than 60%), it is in the form of plastic failure, and the strength is low and the deformation is great when it is damaged. The law of shear characteristics on the composite sliding surface is complex. The shear strength of the composite sliding surface varies with the proportion of lithology, and the stress distribution also appears larger or smaller stress concentration due to different lithology. Therefore, when the shear characteristics parameters of the composite sliding surface are selected and the weighted average values are taken according to the proportions of lithology, it is appropriate when the proportion of hard rock exceeds 60%, while in soft rock (the ratio of soft rock exceeds 60%) controlled composite sliding surface weighted average is unreasonable and dangerous. The selection of shear parameters on the composite sliding surface is reasonable with the weighted average method, but the choice of the experimental data has a certain degree of arbitrariness. Trying to find a certain scientific and more accurate and reliable method should be applied to engineering design.