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重庆奉云高速分界梁滑坡体厚度达到35m,如果采用全长抗滑桩支挡,桩总长可达50m左右,弯矩和截面都非常大。采用埋入式抗滑桩后桩的长度、截面尺寸、钢筋用量都大大减小,和全长桩相比节省投资1/3左右。本文介绍了该滑坡采用埋入式抗滑桩的设计计算方法。首先采用有限元强度折减法算出不同桩长时的稳定安全系数,并以设置埋入式抗滑桩后的稳定安全系数达到规范要求的稳定安全系数为原则。当设桩后的稳定安全系数达到规范要求时,此时的桩长即为合理桩长。工程现场监测数据表明,该滑坡采用埋入式抗滑桩加固后滑坡深部位移和抗滑桩受拉钢筋应力均较小,表明该滑坡治理是成功的,另一方面也表明采用有限元强度折减法进行埋入式抗滑桩的长度设计是可行的,可供类似工程参考。
Chongqing Fengyun high-speed demarcation beam landslide body thickness of 35m, if the use of full-length anti-slide pile support, pile length up to about 50m, bending moment and cross-section are very large. After the embedded anti-slide piles, the length, cross-sectional dimension and the amount of steel bar are greatly reduced, saving about 1/3 of the total length of the pile. This paper introduces the design and calculation of embedded anti-slide piles. First of all, using the strength reduction method of finite element to calculate the stability factor of different length of pile, and setting the stability factor of stability after embedded anti-slide pile reaches the standard requirement of the principle of stability and safety. When the post-pile stability and safety factor to meet the specifications, then the length of the pile is reasonable length. The monitoring data of the project site shows that the deep landslide displacement and the stress of the anti-slide pile are less after the landslide is strengthened by embedded anti-slide piles, which indicates that the landslide control is successful. On the other hand, Subtraction for embedded anti-slide pile length design is feasible, for similar projects.