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为了明确孔壁粗糙度对深嵌岩桩承载特性的影响,采用室内模型试验方法,通过室内5组嵌岩桩的试验结果,分析了深嵌岩桩在桩端存在沉渣和密实2种情况下孔壁粗糙度因子对桩顶极限承载力、桩侧摩阻力和桩端阻力的影响。结果表明:粗糙孔壁对提高桩基的极限承载力是非常有利的,且桩端存在沉渣时,提高效果更为明显;在软岩地区,孔壁粗糙度对极限承载力的贡献并不是无限增长的,特别是在桩端存在沉渣的情况下,随着孔壁粗糙度的增大,极限承载力还有可能出现下降的趋势;孔壁粗糙度对桩端阻力也有一定影响,孔壁粗糙度大的桩,其桩端阻力发挥作用所需要的位移相对较小。
In order to clarify the influence of hole wall roughness on the bearing capacity of deep rock piles, indoor model test method was used to test the effect of the five kinds of rock-socketed piles. INFLUENCE OF ROCK HOLE FACTOR ON THE ULTIMATE CAPACITY OF PILE, Frictional Resistance at Pile Side and Resistance at Pile Tip. The results show that the rough hole wall is very beneficial to improve the ultimate bearing capacity of pile foundation, and the settlement effect is more obvious when there is sediment in pile end. In soft rock area, the contribution of roughness of hole wall to ultimate bearing capacity is not infinite With the increase of the roughness of the hole wall, the ultimate bearing capacity is likely to decline. The roughness of the hole wall also has some influence on the resistance of the pile tip, and the roughness of the hole wall Degree of pile, the pile end resistance to play the role of the required displacement is relatively small.