摘要
在岩溶发育地区,多采用嵌岩灌注桩作为桥梁基础。当地下条件较好时,人工挖孔桩通过合理的简化,可将其嵌岩灌注桩物理模型简化为端承桩,暂不考虑上部桩周土摩阻力。当桩基作用在岩溶顶板上且岩溶顶板厚度不是足够厚时,需对嵌岩桩桩基的稳定性进行分析与讨论。本文通过具体的算例,对岩溶顶板的抗冲切、抗剪和抗弯强度进行了详细的验算,并在进行抗弯验算时分别讨论了不考虑自重和考虑自重两种受力情况,通过分析可知岩体的抗弯强度是影响桩基稳定性的主要因素。
Rock-socketed piles are always used as the bridge foundations in the Karst area. If the geology condition is better, the physical model of man-dug pile can be regarded as end-beating pile by reasonable simplification without considering the friction resistance of the soil. When the thickness of Karst roof is not enough, the stability of rock-socketed pile foundation should be analyzed and discussed. Through a lot of typical cases, the tensile strength, shear strength and bend strength of Karst roof have been calculated, respectively. Two kinds of bend strength conditions （one considering deadweight and one not considering） have also been discussed. The bend strength is the crucial influence factor of the stability of rock-socketed pile foundation.
出处
《工程勘察》
CSCD
北大核心
2006年第9期50-53,共4页
Geotechnical Investigation & Surveying
关键词
岩溶顶板
嵌岩桩
简化模型
抗弯强度
Karst roof
rock-socketed pile
simplified model
bend strength
