Abstract: In order to solve the problems of effective protection and safe excavation in the construction of complex geological slope support, the construction technology of slope support for road reconstruction and expansion is proposed. Lizheng software is applied to repeatedly calculate slope support and various parameters under excavation height, and a series of data are obtained. A reasonable calculation formula is obtained for the optimal cutting height of support through the non-linear fitting function of multiple functions in Matlab. After determining the optimal cutting height and reasonable slope surface shape, the road to expand the slope is excavated, geological information isdynamically obtained, and the limit equilibrium method is applied to implement dynamic stability evaluation of the slope. Based on the evaluation results, advanced support for road reconstruction and expansion slopes is implemented, and optimized support schemes for unstable slopes are proposed. After verifying its rationality through numerical analysis methods, the support plan will be implemented and the next stage of excavation operations will proceed. Stable slopes will directly proceed to the next stage of construction. The application results show that one month later, the deformation in the X, Y, and Z directions is less than 2.5mm, achieving good construction results.

Key words: complex geology, Lizheng software, road renovation and expansion projects, limit equilibrium method, slope support construction

摘要： 为了解决复杂地质边坡支护施工中的有效防护与安全开挖问题,提出道路改扩建边坡支护施工技术。应用理正软件重复计算开挖高度下边坡支护与各种参数,获取一系列数据,通过Matlab中的多元函数非线性拟合功能得到支护最佳切坡高度的合理计算公式。确定最佳切坡高度与合理坡面形后,开挖道路改扩建边坡,动态获取地质信息,应用极限平衡法实施边坡动态稳定评判。根据评判结果实施道路改扩建边坡的超前支护,对欠稳定边坡提出优化性的支护方案,通过数值分析方法验证其合理性后实施该支护方案,进入下一阶段的开挖作业;对稳定边坡直接进入下一阶段的施工。应用结果表明,一个月后,X、Y、Z三个方向上的变形均低于2.5mm,达到了较好的施工效果。

关键词: 复杂地质, 理正软件, 道路改扩建工程, 极限平衡法, 边坡支护施工