摘要
城市建筑改造和修复工程发展迅速,钻孔灌注桩和地基处理的联合应用能有效地解决施工条件限制和承载力的要求,提高经济效益和工程效率.目前二者联合应用的实例和研究相对较少.通过现场试验,对高压旋喷地基处理前后相同规格的钻孔灌注桩进行荷载试验,对比分析旋喷处理前后灌注桩的荷载-沉降曲线、极限承载力及桩侧摩阻力分布等规律.结果表明,旋喷加固前后灌注桩竖向荷载传递规律相似;旋喷加固后灌注桩的竖向极限承载力提高,相同荷载下沉降降低;高压旋喷提高了土体侧摩阻力,旋喷对浅层土的加固效果高于深层土,对粉土侧摩阻力的提高效果要高于黏性土.
In the reconstruction and restoration project,the ground treatment which improves the bearing capacity of bored pile can obtain much more economic benefit and engineering efficiency. However,relatively less research has been carried out on the combined application of ground treatment and bored pile. Based on the data of in- situ static load tests,the laws of load- displacement curve,internal force,and soil friction resistance of single pile were discussed. The test results show that the load transfer mechanism of bored piles is the same each other. The vertical bearing capacity of bored pile reinforced by high pressure jet grouting is significantly improved,and the displacement is less under the same load. The skin friction resistance is enhanced by high pressure jet grouting. The effect of high pressure jet grouting reinforcement to shallow soil is larger than that to deep soil,and the skin friction resistance of silty soil grows larger than that of clay soil.
出处
《佳木斯大学学报（自然科学版）》
CAS
2015年第2期222-226,共5页
Journal of Jiamusi University：Natural Science Edition
关键词
钻孔灌注桩
高压旋喷
现场试验
承载特性
bored pile
high pressure jet grouting
in-situ static load test
bearing behavior
