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针对山区陡坡桥墩的复杂受力特点,根据某陡坡双桩柱式桥墩的工程实际情况,利用ADINA有限元分析程序的模拟结果,分析了墩顶竖向荷载、坡顶荷载、桩径、桩柱混凝土强度等级、桩周(岩)土的弹性模量、桩间距等对双桩柱桥墩沉降的影响。结果表明:在竖向荷载作用下,前桩墩顶的沉降比后桩墩顶的大,且随着荷载的增加其差值也越来越大;但是在坡顶荷载作用下,前、后墩顶的沉降变化规律则相反;不论是在墩顶竖向荷载作用下,还是在坡顶荷载单独作用下,前桩柱墩顶的沉降增量总比后桩柱墩顶的要大。在一定的墩顶竖向荷载作用下,随着墩周(岩)土的弹性模量、桩径、桩柱混凝土强度等级的增加,双桩柱墩顶的沉降量都减少,且其减幅基本相同。
Aiming at the complex stress characteristics of steep slope piers in mountainous area, according to the actual engineering conditions of double-column pier in a steep slope, the simulation results of ADINA finite element analysis program are used to analyze the influence of vertical load, slope load, pile diameter, Concrete strength grade, elastic modulus of pile surrounding soil (rock) and pile spacing on the settlement of double pile pier. The results show that under the action of vertical load, the settlement of the top of the former pile is larger than the top of the back pile, and the difference is also increasing with the increase of the load. However, under the action of the top load, The settlement of the top of the pier is the opposite. The settlement of the top of the front piles is always larger than the top of the post-pillars, either under the vertical loading of the pier or under the action of the top load. Under the certain vertical load at the top of the pier, with the increase of elastic modulus, pile diameter and strength of concrete, the settlement at the top of the double-column pier decreases with the decrease of the elastic modulus, basically the same.