库水位骤变对库岸高陡岩质边坡稳定性影响的研究

发布时间：2018-06-18 09:15

本文选题：高陡岩质边坡 + 水位骤变　；参考：《重庆大学》2015年硕士论文

【摘要】：我国西南地区水资源丰富,在水资源的开发利用过程中往往会遇到西南地区非常具有代表性的岩质高边坡问题。岩质高边坡是山区工程建设中的重要地质环境和工程承载体,西南地区岩质高边坡具有边坡高陡,坡型复杂,边坡应力量级高,具有复杂的变形破裂演化历史等特点。而在涉及到高陡边坡的水利水电工程中,水——岩石相互作用往往是诱发高陡岩质边坡失稳的主要原因之一。本文首先采用单裂隙岩体模型对岩体在裂隙水作用下的等效弹性模量进行了相关的公式推导,并通过有限元数值计算对相关理论公式进行了验证,同时与现有的传统打折方法进行了对比。通过数值分析,得到了边界拉应力作用下与渗流力作用下模型的等效弹性模量折减规律。将孔隙水压力视作静孔隙水压力,渗流力和超孔隙水压力三部分构成,论述孔隙水压力对岩体强度的影响。推导了静孔隙水压力对处于压剪状态及张剪状态的岩体的折减强度公式。并且,将超孔隙水压力的作用视作裂隙开展,超孔隙水压的增加,裂隙尖端局部渗流力三部分的共同作用分别推导得出了三部分作用对强度的折减公式。利用推导获得的公式及结论,将其应用于对实际工程的有限元数值分析之中,实现了平面模型及三维模型中渗流场与应力场的耦合,通过数值分析结果来探讨水位骤然变化下,渗流场的变化规律以及对渗流场对边坡稳定性的影响。
[Abstract]:The southwest region of China is rich in water resources. In the process of exploitation and utilization of water resources, it is often met with the problem of high rock slope which is very representative in southwest China. High rock slope is an important geological environment and engineering carrier in the construction of mountainous area. The rock high slope in southwest China has the characteristics of high and steep slope, complex slope type, high slope force level and complicated history of deformation and fracture evolution. In water conservancy and hydropower projects involving high and steep slopes, the water-rock interaction is often one of the main reasons for inducing the instability of high steep rock slopes. In this paper, the equivalent elastic modulus of rock mass under the action of fissure water is deduced by using a single fractured rock mass model, and the relevant theoretical formulas are verified by finite element numerical calculation. At the same time with the existing traditional discount methods are compared. Through numerical analysis, the equivalent elastic modulus reduction law of the model under boundary tension stress and seepage force is obtained. The pore water pressure is regarded as static pore water pressure, seepage force and excess pore water pressure. The influence of pore water pressure on rock mass strength is discussed. The formulas for reducing the strength of rock mass in compression-shear state and tension-shear state by static pore water pressure are derived. Moreover, the effect of excess pore water pressure is regarded as the joint action of fracture, the increase of excess pore water pressure and the local seepage force at the crack tip. By using the derived formula and conclusion, it is applied to the finite element numerical analysis of practical engineering. The coupling of seepage field and stress field in plane model and three-dimensional model is realized, and the sudden change of water level is discussed through numerical analysis results. The variation of seepage field and the influence of seepage field on slope stability.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU457

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