加锚节理力学特性及其边坡稳定性研究

发布时间：2018-04-12 00:34

本文选题：节理边坡 + 力学特性　；参考：《重庆大学》2015年硕士论文

【摘要】：随着基础建设的不断发展,边坡工程日益增多,节理边坡失稳问题凸显出来,锚杆加固技术作为最常用的边坡支护手段广泛应用于工程中。但是由于地质体本身性质的复杂与多样性,导致目前的锚杆支护机理理论还不够完善,对工程的指导作用还存在一定不足,继续开展锚杆加固边坡方面的研究很有必要。本文抓住节理边坡稳定性及强度往往受控于节理弱面的性质这一思想,对节理弱面进行了研究,宏观上分析了其性状对节理边坡破坏类型的影响,细观上分析了节理弱面的力学特性,基于地质体渐进破坏原则建立了平直节理面渐进破坏计算模型,更合理的描述节理的剪切特性;在节理渐进破坏计算模型基础上,考虑锚杆对节理弱面的加固作用,推导了加锚节理面抗剪强度表达式,其反映出锚杆抗剪支护理论适合描述锚杆对节理边坡的支护作用,即可以将锚杆对节理边坡的加固作用等效为节理“粘聚力”的增大;将此结论应用于节理边坡锚固平面滑动稳定性分析中,可得考虑锚杆受拉剪作用的边坡稳定性系数计算公式,可以从稳定性系数上定量反映锚杆加固效应。采用ANSYS对无支护和加锚支护的节理岩质边坡进行数值模拟,通过位移、应力以及稳定性系数的对比,反映了锚杆加固效应,并验证了稳定性计算公式的可行性和适用性;结合工程实例,采用两种考虑方式对锚杆进行设计,通过对比可知当采用全粘结锚杆支护节理边坡时,考虑锚杆轴横向作用的设计不仅更为合理,还可能达到节约钢材的目的。
[Abstract]:With the development of basic construction, slope engineering is increasing day by day, and the problem of joint slope instability is prominent. As the most commonly used means of slope support, bolt reinforcement technology is widely used in engineering.However, due to the complexity and diversity of the geological body itself, the current theory of bolt support mechanism is not perfect enough, and the guiding role of the project is still insufficient. It is necessary to continue the research on bolting reinforcement of slope.Based on the idea that the stability and strength of joint slope are often controlled by the properties of joint weak plane, this paper studies the joint weak plane, and analyzes the influence of its characteristics on the failure type of joint slope.Based on the principle of progressive failure of geological bodies, a computational model of progressive failure of plane joints is established, which can more reasonably describe the shear characteristics of joints, and on the basis of the calculation model of progressive failure of joints,Considering the reinforcement effect of bolt on weak plane of joint, the expression of shear strength of bolted joint surface is deduced, which reflects that the theory of bolt shear support is suitable to describe the supporting effect of bolt on jointed slope.That is to say, the reinforcement effect of anchor rod on jointed slope can be equivalent to the increase of cohesive force of joint, and the conclusion can be applied to the analysis of plane sliding stability of joint slope Anchorage plane.A formula for calculating the stability coefficient of the slope considering the tension and shear action of the anchor rod can be obtained, and the reinforcement effect of the anchor rod can be quantitatively reflected from the stability coefficient.The ANSYS is used to simulate the jointed rock slope without support and bolting. Through the comparison of displacement, stress and stability coefficient, the reinforcement effect of bolt is reflected, and the feasibility and applicability of stability calculation formula are verified.Combined with engineering examples, the design of anchor rod is carried out by two ways of consideration. Through comparison, it can be seen that when fully bonded anchor rod is used to support jointed slope, the design of considering transverse action of anchor shaft is not only more reasonable, but also may achieve the purpose of saving steel.
【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】：TU43

【参考文献】