重力式锚碇水平极限承载力估值公式探讨

发布时间：2018-03-04 21:38

本文选题：重力式锚碇　切入点：协同作用　出处：《铁道工程学报》2017年01期 　论文类型：期刊论文

【摘要】：研究目的:当前基于摩擦设计的重力式锚碇的水平极限承载力估值偏保守,没有考虑锚碇结构与地基协同作用,联合承载的估值结果与实际偏差较大。本文利用平硐岩基摩擦试验、重力式锚碇基底深部位移监测和数值仿真试验等手段,探讨重力式锚碇与岩基的协同作用和联合承载机制。研究结论:(1)极限试验破坏形态揭示了重力式锚碇不是单纯的摩擦承载,而是锚-岩联合承载;(2)锚碇-岩基联合极限承载分为两个阶段和三个效应,初期为基底摩擦极限承载,摩擦效应;之后,前部齿坎夹持岩体剪切破坏极限承载,锚岩系统联合承载性能达到极限,夹持效应;基底上覆土重量对上述两部分都有提高,回填效应;(3)提出了考虑上述效应和联合承载机制的重力式锚碇水平极限承载力估算公式,经工程案例检验,公式极限估值9.6P与数值仿真确定的极限值8.0P接近,说明公式精度有保证,符合实际破坏模式;(4)该研究成果可用于新型重力式锚碇的设计和安全监控领域。
[Abstract]:The purpose of this study is to estimate the horizontal ultimate bearing capacity of gravity Anchorage based on friction design, which is conservative and does not take into account the synergistic effect of Anchorage structure and foundation. The estimation results of combined loading are quite different from the actual ones. In this paper, the friction test of adit foundation, the deep displacement monitoring and numerical simulation test of gravity Anchorage foundation are used. The synergistic action and joint bearing mechanism of gravity Anchorage and rock foundation are discussed. Conclusion: 1) the failure pattern of ultimate test reveals that gravity Anchorage is not a simple friction bearing capacity. However, the combined ultimate bearing capacity of Anchorage and rock is divided into two stages and three effects, the initial stage is the ultimate bearing capacity of the base friction, the friction effect, and the ultimate bearing capacity of shear failure of the rock mass clamped by the front teeth. The ultimate bearing capacity and clamping effect of Anchorage system are reached, and the weight of the overlying soil on the base increases to both parts above, and the backfill effect is 3). A formula for estimating the ultimate bearing capacity of the gravity Anchorage level considering the above effects and the combined bearing mechanism is put forward. It is proved by engineering cases that the formula limit estimate of 9.6p is close to the limit value of 8.0P determined by numerical simulation, which shows that the formula accuracy is guaranteed and accords with the actual failure mode.) this research result can be used in the design and safety monitoring field of new gravity Anchorage.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室;云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;
【基金】：云南省交通科技项目〔云交科2011(LH)12-a;云交科2014(A)01〕陆地交通气象灾害防治技术国家工程实验室开放基金(NELBP201501)
【分类号】：U448.25

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