公路高边坡稳定性评价及支护优化设计

 公路高边坡具有数量多、地质条件复杂及施工速度快等特点，施工期变形破坏事例频发。基于这一现状，依托皖南山区汤屯高速公路，提出一套操作性强的公路高边坡优化设计研究方法。通过“高边坡普查→提出优化设计分区建议→筛选重点边坡→重点边坡优化研究”的工作思路，形成优化设计研究成果，由业主、设计、施工等单位将科研成果快速应用于高边坡施工。将变形理论与强度理论相结合，形成基于地质过程原理的重点高边坡稳定性评价和灾害控制方法，通过边坡变形稳定性分析，判断边坡变形破坏模式及发展过程；结合施工及监测反馈信息，分析目前所处阶段、潜在滑动面位置等。然后，利用强度稳定性分析方法得出边坡治理设计所需数据，进行优化设计，再采用变形理论结合施工和监测反馈信息验证支护效果，进一步优化设计，确定最终方案。实践结果表明，这套方法保证了公路高边坡的快速施工和正常运营。

STABILITY EVALUATION OF HIGH SLOPE FOR HIGHWAYS AND OPTIMIZED SUPPORT DESIGN

The high slopes of highways have many features，such as the large number，the complicated geological conditions，the high-speed construction，etc.. Based on the feature that deformation occurs frequently during construction period，a perfect operation method of optimized design is proposed with a specific case of Tangkou—Tunxi expressway construction in Southern Anhui Province. Through the work flowchart of general survey of high slope→proposing advices on partitions of optimizing design→choosing key slope→optimized analysis of key slope，the research results of optimized design for high slope are achieved. With the efforts of employer，designer and constructer，the scientific research results are employed quickly in engineering construction. Based on the combination of deformation theory and strength theory for slope engineering，the stability evaluation and geohazard controlling methods for key high slope are performed on the basis of geologic process principle. Through the stability analysis of deformation theory for slope，the modes of slope deformation and failure，the development processes of deformation and failure can all be determined. Combining with feedback of construction and monitoring data，both the present stability state and potential position of sliding surface can be analyzed. Afterwards，using the analytical method of strength stability，the required data for the design of slope support can be achieved；then the design can be optimized. Subsequently，in terms of deformation theory and the feedback information of construction and monitoring，the support results can be verified；and the further optimization can be realized. The detailed practice shows that the proposed method can realize high-speed excavation of high slope and normal service for highways.