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地震是诱发边坡破坏的重要因素之一,而抗滑桩是一种重要的边坡防治工程措施,因此开展地震作用下抗滑桩机理对于边坡防护具有重要的工程意义。本文以广东省梅州市茶阳车站为工程实例,运用ABAQUS软件建立三维模型,对地震作用下的桩土作用机理进行数值模拟分析。研究表明:(1)在地震作用下,边坡中上部水平位移较大,最大值为87.05mm,凹陷处水平位移远小于凸起处;(2)地震作用下抗滑桩会由于地震荷载产生远大于地震前的应力:静力作用下桩身最大值是147.24kPa,地震波输入14s时桩身最大值达到了326.36kPa;(3)地震作用下抗滑桩的应变亦远大于静力作用下的应变:静力作用下抗滑桩应变最大值是4.63×10~(-5),在地震波输入的第14s时桩身应变最大值是34.10×10~(-5)。因此在工程实践中对于地震作用下的抗滑桩边坡加固需要考虑桩的强度与刚度。研究结论对于边坡防治以及工程实践具有一定的指导意义。
Earthquake is one of the important factors that induce slope failure. Anti-slide piles are an important engineering measure for slope prevention and control. Therefore, the anti-slide pile mechanism under earthquake action has important engineering significance for slope protection. In this paper, Cha Yang station in Meizhou City, Guangdong Province as an example, the use of ABAQUS software to establish three-dimensional model of the action of the pile-soil interaction under the action of numerical simulation. The results show that: (1) Under the earthquake, the horizontal displacement of the middle and upper part of the slope is larger, the maximum is 87.05mm, the horizontal displacement of the depression is much smaller than that of the bulge; (2) Far greater than the pre-earthquake stress: the maximum of pile under static load is 147.24kPa, and the maximum of pile body reaches 326.36kPa when the seismic wave is input for 14s; (3) The strain of anti-slide pile under earthquake is also far greater than that under static load The maximum strain of anti-slide pile under static load is 4.63 × 10 ~ (-5), and the maximum value of pile strain at 34th-hour of earthquake input is 34.10 × 10 ~ (-5). Therefore, it is necessary to consider the strength and stiffness of piles for the reinforcement of anti-slide pile slopes under earthquake action in engineering practice. The conclusion of the study is of guiding significance for the prevention and control of slope and engineering practice.