悬臂桩嵌固深度和桩前基岩阻滑宽度研究

摘要

限于场地原因，需对悬臂桩桩前基岩超深开挖，且仅留有一定宽度的阻滑岩体，导致了阻滑岩体能否保证悬臂桩安全有效的问题。以岳阳滑坡悬臂桩桩前嵌固段岩体为研究对象，建立了桩前基岩的计算模型，探讨了不同嵌固深度下的安全阻滑宽度，并结合数据拟合方法建立了两者之间的函数关系。结果表明：嵌固深度越大，安全阻滑宽度越小，两者之间呈幂函数关系，其关系式为 hr ＝16．9051B－0．7540，并提出了岳阳滑坡最优的设计参数为嵌固深度6．24 m、阻滑宽度3．75 m。研究结果可为此类工程设计提供一定的理论指导和借鉴意义。%Due to spatial limitations, deep excavation of bedrock in front of cantilever pile is needed ; besides, a limited width of anti-slide rock is available, which leads to the problem whether the anti -slide rock could guarantee the safety of the cantilever pile.The safe width of anti-slide rock to ensure stability under different embedded depths are discussed through building a computational model of bedrock in front of the pile , and the functional relationship between the width of anti-slide rock and the embedded depth is established with data fitting method.The embedded rock in front of the cantilever pile of a landslide in Yueyang is taken as a case study .Results show that the greater the embedded depth, the smaller the needed width of anti -slide rock to ensure the stability, and they are in a power function relationship hr =16.905 1B-0.754 0 .Furthermore, the optimal design parameters of Yueyang landslide is :embedded depth 6.24 m, and width of anti-slide 3.75 m.The results could provide a theoretical guidance and refer -ence for such projects.