节理化岩质边坡开挖稳定性分析及支护方案设计

Stability Analysis on Jointed Rock Slope Excavation and Design of Strengthening Scheme

以庄盖高速公路K56+356处岩质边坡处理工程为依托,充分考虑渗流作用,利用建模软件(PGEN)和离散元软件(3DEC)建立真实的岩质边坡三维数值模型,分析各阶梯开挖后岩质边坡的稳定性,结合自编的slope consolidate软件计算锚固力和锚杆数量。分析结果表明:在不采取任何支护措施的情况下,边坡开挖到第四阶梯时,整体沉降量较小,边坡稳定性保持较好。继续开挖,部分块体将发生剥落、滑移等现象,最终导致边坡整体失稳破坏。为了保证工程的正常进行,提出在第四阶梯开挖完成后对边坡进行锚杆加固,在第五阶梯、第六阶梯边开挖边支护的加固方案。

This paper relies on rock slope treatment project situated in the stake number K56 ＋356 of GaizhouZhuanghe Highway. Taking advantage of the modeling software（ PGEN） and the discrete element software（ 3DEC）to establish a three-dimensional visual numerical model of rock slope and analyze the stability after each stage excavation of rock slope incorporating with the seepage effect combined with self made software Slope Consolidate to calculate the anchor force and anchor number. It can be concluded that the whole settlement is small after the fourth step excavation without taking any support,and the global stability of slope is acceptable. With the excavation continues,the equilibrium of some slope blocks is interrupted by the unfavorable phenomena,such as flake and slip,which eventually leads to the overall instability of the slope. In order to guarantee the project safety,the support scheme was proposed,that was to anchor the slope using bolt after the fourth step excavation,and continue to anchor along with the fifth and sixth excavation proceeded.