卸荷裂隙岩体在桥基荷载作用下的力学行为研究

为研究卸荷裂隙附近岩体在桥基荷载作用下的力学行为，在分析桥基和岩体相互作用以及裂隙模拟方法的基础上，建立了二维有限元模型，分析卸荷裂隙不同的深度和倾角下，裂隙表面的位移和应力影响系数变化情况。结果表明：桥基荷载下，裂隙表面的位移以竖向位移为主；应力影响系数随着裂隙深度先增加后减小，最后趋于固定值；卸荷裂隙倾角达到90°时，应力影响系数急剧增大，这说明竖向裂隙对边坡的应力影响最大。

Mechanical Behavior of Rock Mass near Unloading Crack Under Load

To study the mechanical behavior of rock mass near the stress-release crack under bridge foundation load ,a two-dimensional finite element model was developed based on fracture simulation method and the analysis of the interac -tion between rock mass and the bridge foundation .Then the model was used to calculate the displacement and stress in-fluence coefficient changed with different depth and stress-release crack angle .The results show that the vertical displace-ment is the main displacement of the fracture surface and the stress influence coefficient increases initially and then de -creases with the changing of depth ,and finally reaches to a fixed value under the bridge foundation load .When the angle of the tress - release crack reaches 90° ,the stress influence coefficient increase sharply which means the vertical crack has the major impact on slope stress .