嵌岩桩水平承载性能影响因素模拟分析

嵌岩桩目前广泛应用于岩土工程中来承受水平荷载，但如何准确分析其水平承载性能仍是工程难题。本文采用FLAC^3D软件建立水平受荷嵌岩桩数值模拟模型，将模拟结果与实测结果进行对比。在验证了数值模拟方法及结果正确的基础上，分析岩体参数（岩体弹性模量E、黏聚力c、内摩擦角φ）、桩径、露头高度、嵌岩深度和桩身混凝土强度对其水平承载性能的影响。结果表明，岩体E、c、φ的增加可提高桩的水平承载力，E在桩体受力开始时便影响其水平承载能力，c、φ则在岩体进入塑性阶段后产生影响；桩径对桩的水平承载性能影响显著；桩身嵌岩深度的影响存在临界值，本次模拟中当嵌岩深度超过3倍桩径后，其水平承载能力的提高缓慢；桩身混凝土强度的提高可增强桩的水平承载能力，但效果不明显。露头高度的增加会降低桩的水平承载性能。本文从岩体和桩体两个方面出发，克服了以往影响因素选择不够全面的不足，其研究成果可为今后工程中嵌岩桩的设计提供参考。

SIMULATION ANALYSIS OF FACTORS AFFECTING THE LATERAL BEA-RING CAPACITY OF ROCK-SOCKETED PILES

Rock-socketed piles are widely used in geotechnical engineering to bear lateral load. However, it is still difficult for us to accurately analyze its lateral bearing capacity. We established a numerical simulation model of rock-socketed piles under the lateral load by using FLAC^3D, and compared the simulated results with the measured results. Due to the high coincidence degree between the two results, we further analyzed the influence of rock mass parameters(elasticity modulus E, cohesion c, angle of internal friction φ), pile diameter, outcrop height, socketed depth and pile concrete strength on the lateral bearing capacity of rock-socketed pile. The results show that the increase of rock mass(E, c, φ) can increase the lateral bearing capacity of pile. E affects its lateral bearing capacity at the beginning of the force, and c, φ has an impact after the rock mass enters the plastic stage. Pile diameter has a significant influence on the lateral bearing capacity of pile. There is a critical value for the impact of socketed depth. When the socketed depth exceeds 3 times of pile diameter in this simulation, the lateral bearing capacity of pile increases slowly. The increase of pile concrete strength can enhance its lateral bearing capacity, but the effect is not obvious. The increase of outcrop height reduces the lateral bearing capacity of pile. Based on rock mass and pile body, this paper overcomes the lack of comprehensive selection of influencing factors in the past, and the results can provide reference for the design of rock-socketed piles in future projects.