高边坡卸荷岩体稳定性分析

岩质边坡在长期的地质作用下往往会被多组结构面所切割,形成复杂的卸荷裂隙岩体,而高边坡中的卸荷岩体直接影响到整个边坡的稳定性.依托西南某拱坝右坝肩高边坡工程,从地质分析的角度,对边坡卸荷岩体进行分区节理统计,进而划分出可能的局部不稳定块体,并定性评价了边坡的整体稳定性.在此基础上建立了三维地质模型,分别采用强度折减法和关键块体理论分析并评价了该工程高边坡卸荷岩体的局部稳定性,并提出了在地质勘察、安全监测、加固处理和施工控制等方面的建议.研究结果表明,该高边坡卸荷岩体整体稳定性较好,但局部存在潜在不稳定块体.该研究成果对类似工程具有重要的参考价值.

Stability anlysis of unloading rockmass of high slopes

Under a long period geological action,rock slope may be cut by several groups of structural planes;and unloading fissured rockmass may come into being.The unloading rockmass has a direct impact on the stability of high slope.On the base of unloading rockmass of high slope at the right abutment of an arch dam in Southwest China,from the angle of geological analysis,the joint statistics distribution of unloading rockmass is marked out;several possible local unstable blocks are found out;and the overall stability of slope is evaluated qualitatively.Then a 3Dgeological model is built;and the local stability of slope is analyzed and evaluated by strength reduction method and key block theory respectively.Finally,some suggestions on geological reconnaissance,safety monitoring,reinforcement treatment and construction control are proposed.The research results show that the unloading rockmass of high slope is stable as a whole;but local potential unstable blocks still exist.Research results obtained in this paper have important reference value to similar projects.