期刊论文

Wang, Q.-Y.(wangqiyun860519@163.com)

中文

岩土工程学报

1000-4548

2011

33

4

661-666

国家自然科学基金项目（50908233）；

本校为其他机构

针对红砂岩嵌岩桩桩-岩界面的摩阻特性进行了现场模型试验。试验研究表明,红砂岩嵌岩桩侧摩阻力呈现上大下小的分布模式,并随着岩石节理裂隙、钻孔质量等因素呈现波动,破坏时桩身上部的侧阻力远大于下部侧阻力值。随着桩长的增加,桩侧摩阻力的发挥效率降低,极限侧摩阻力减小;桩周红砂岩的软化会明显降低极限侧摩阻力和承载力,并改变红砂岩嵌岩的破坏模式;随着桩端刚度的增加,侧阻力分担比变小,发挥速度加快;增加桩长或桩端刚度使侧阻力有向桩身上部集中的趋势。根据现行规范确定的红砂岩嵌岩桩承载力存在较大的安全储备。

Model tests on the shear resistance behaviors of rock-concrete interface are carried out with regard to rock-socketed piles in red-sandstone rock. The results indicate that the shear resistance of rock-socketed piles in red-sandstone decreases with increase of depth, and fluctuates along with characters of rock joints and cracks and the drilling quality and so on. In addition, the mobilized pile resistance in the upper zone is much greater than that in the lower zone while the load comes to the limit vertical bearing capacity of the piles. The length of the piles will impact load transfer effi...