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以高寒地区某国道改建工程K2 791+690~K2 791+810段高陡岩质边坡为背景,建立三维弹塑性有限元模型,对边坡的施工过程进行模拟,研究不同施工过程高边坡岩体变形、应力及边坡稳定性。结果表明:数值计算结果与现场监测数据较为吻合,计算结果较为可靠;高陡岩质边坡坍塌区开挖导致表层岩体顺坡向位移增大,坡体内部塑性区进一步扩大,表层附近岩体朝不稳定方向发展,但深部弱风化、微风化岩体内应力场、位移场受开挖影响有限,相比之下,正常区开挖则略有利于坡体稳定;锚索对坡体表面施加的预应力使强风化坍塌区浅层塑性区由加固前自坡顶向坡脚的成片连续变为不连续,大规模浅层坍塌可能性减小,锚索加固措施较为安全可靠。
Based on the background of K2791 +690 ~ K2791 + 810 high-steep rock slope in a national highway reconstruction project in the alpine region, a three-dimensional elasto-plastic finite element model is established to simulate the construction process of the slope, Rock mass deformation, stress and slope stability. The results show that the numerical results are in good agreement with the on-site monitoring data, and the calculation results are more reliable. Excavation of collapsed area with high and steep rock slopes results in the increase of the displacement of surface rock mass along the slope, the plastic zone inside the slope body further expands, The body is moving toward unstable direction, but the deep weak weathering and the stress field and displacement field in the slightly weathered rock mass are limited by excavation. In contrast, excavation in normal area is slightly more conducive to slope stability; Prestressing on the surface makes the shallow plastic zone in the strongly weathered collapse area continuously become discontinuous from the top of the slope to the foot of the slope before strengthening, the possibility of large-scale shallow collapse decreases, and the reinforcement measures of the anchor cables are relatively safe and reliable.