中文摘要：

基于室内模型试验，对岩溶区嵌岩桩的承载能力与破坏模式进行了研究。试验表明，随顶板厚度与溶洞位置偏移距离的增大，极限承载力逐渐增大，随溶洞直径、赤道半径与极半径的增大，极限承载力逐渐减小；破坏核体在竖直方向上基本未超过3d，在水平方向上基本未超过4d；嵌岩桩与基岩相互作用系统的破坏模式主要有冲切破坏、冒落区塌落、扇形塑性区破坏和“撕裂”破坏，破坏模式主要受顶板厚度、溶洞赤道半径b以及c／b的影响；嵌岩桩承载能力还与溶洞形状有关，建议引进形状系数ζ。结合不同条件下岩溶区嵌岩桩的破坏模式，提出一系列安全可靠、便于工程应用的计算公式。

英文摘要：

Based on model tests, the failure mode and bearing capacity of＂ rock-socketed pile in karst mea were studied. The tests indicate that with the increases of roof thickness and cave offset distance, the ultimate bearing capacity increases gradually, while with the increases 9f cave diameter, equatorial and polar radius, the ultimate bearing capacity decreases gradually. The f＇zilure zenes were located in less than 3d range in the vertical direction and less than 4d range in the horizontal direction. The failure modes of the interaction system of rock-socketed pile and bedrock include the punching failure mode, cave-collapse failure mode, sector plastic zone failure mode and tearing failure mode. The failure modes were mainly influenced by roof thickness, equatorial radius and c/b. The shape fatctor ζ was introduced to evaluate the bearing capacity of rock-socketed pile due to its relation to cave shape. Based on the iailure modes of rock- socketed piles in karst area under different conditions, a series of reliable computational formula were put forward.