【作者】 陈晨；

【导师】 夏元友；

【作者基本信息】 武汉理工大学 ， 岩土工程， 2012， 硕士

【摘要】 采用预应力锚杆加固边坡是岩土锚固的主要手段,已经逐渐应用于高速公路、铁路、建筑、水利、矿业工程等领域中,作为一种经济、实用且高效的岩土锚固方式,预应力锚固技术的发展已有几十年的历史,但是其机理和设计方法研究还落后于工程实践,特别是锚杆(索)受力演化及地震动响应规律研究更是相对薄弱。论文结合国家自然科学基金(50874085)“边坡加固的压力分散型锚索的加固机理与设计方法”和广东省科技计划项目(63123)“高速公路高陡边坡失稳预测与处治关键技术研究”,以高速公路边坡加固工程中常用的锚杆与预应力锚索为研究对象,采用数值模拟方法,对路堑边坡施工中边坡不同位置锚索的受力演化与在地震作用下的锚索受力变化规律进行了系统研究。首先,论文综述了锚杆(索)的锚固机理与地震作用下锚固边坡的受力分析等的研究进展。其次,采用数值模拟方法对均值类土质不同坡高(30-70米)的路堑台阶边坡施工过程中锚杆(索)预应力变化规律进行了分析,结果表明：边坡不同位置的锚杆(索)受力是不同的,同台阶上中下三根锚索,中间锚索预应力值最大；不同台阶同样位置锚杆(索)随边坡高度增加预应力呈衰减趋势；坡脚台阶中间锚杆(索)预应力值最大；边坡预应力随开挖施工过程,大部分锚杆(索)预应力有损失,但坡脚位置台阶中间锚杆(索)预应力有增大,且随着边坡高度增加,超过初始预应力锚杆(索)数增加。最后,采用数值模拟方法对地震动作用下边坡预应力锚索受力动态响应进行了模拟分析,结果表明：锚索在地震作用过程中的轴力峰值分布规律与静力条件下相似,同台阶上中下三根锚索,中间锚索在震中轴力最大峰值最大；不同台阶同样位置锚索随边坡高度增加预应力呈衰减趋势,锚索在震中的最大轴力峰值出现在坡脚位置。在7级地震和8级地震作用过程中锚索轴力变化很小,在9级地震动作用过程中处于坡脚处锚索的轴力最大峰值增加十分明显,但在同一个边坡模型中,边坡高度的增加锚索轴力减小的很快,边坡其他位置锚索轴力变化不大。随着边坡高度增加,坡脚处台阶上中下三根锚索中,最下面的一根锚索轴力最大。更多还原

【Abstract】 Using pre-stress anchor for slope anchoring is a major way of rock-soil anchoring, it has gradually applied in many engineering like the highway, railway, architectural, hydraulic engineering etc, as a kind of economical、practical and effective way of rock-soil anchoring, the development of pre-stressing anchor technology has decades of history, but to the theoretical study and practical design is far behind the engineering practice. Especially the evolution of anchor stress and the response research of anchor seismic are relatively weak.The thesis combines the national natural science funds (50874085)"The reinforced mechanism and design method of slope reinforce by dispersed pressure of anchor cable "and and science and technology plan of GuangDong projects (63123)" The high and steep slope instability prediction and major treatment techniques of highway ", use prestressed anchor bolt and normal anchor as research object, the numerical simulation method was used to systematic study the discipline of anchor cable force which caused by different location of highway slope under earthquake.First, the paper summarized anchorage mechanism of anchor (cable) and the slope anchorage force analysis are reviewed under seismic action of earthquake. Second, this paper used the numerical simulation method to analyze the change rules of prestressed anchor (cable) force in different high (30-70meters) soil slope of highway., and the results show that: the anchor (cable) force of the slope in different locations is different, one step contain3anchor cables, the uppest one,the middle one and the downest one, and the middle prestress value most; Different steps but the same location anchor (cable) with the slope height increase prestressed show decreaseing trend; The cable located in the slope toe (cable) prestress value the most; as construction proceeding in highway slope, most of the prestressed anchor (cable) have prestress loss, but the middle location of slope steps anchor (cable) stress are increasing, and with the slope’s attitude increase,the number of anchor which force bigger than the initial prestress are increased. Finally, this paper used numerical simulation method analyzed the the action of slope prestressed anchor stress dynamic response under earthquake, and the results showed that the anchor force change law in earthquake and the anchor force change law without earthquake condition are similar,3different anchor cable in the same step, the middle one had the maximum peak axial force; Different steps but the same location anchor (cable) with the slope height increase prestressed show decreaseing trend, the biggest axial force of slope anchor appeard in the slope toe position. In the seven earthquake and eight earthquake process anchor axial force changed little, in9levels earthquake motion process in slope feet of anchor’s cable axial force increase obviously, but with the increase of slope height and the axial force of the anchor stay almost unchangeable. With the slope attitude increases,3three anchor cabl in slope foot step, the downmost one anchor’s axial force is the largest.更多还原