Research On Deep Drainage Technology In Water-rich And High-steep Cutting Slope

The stability of highway slope is the important conditions for safety motion of highway, the research of stability analysis and treatment technology for highway slope have very important meaning for construction of rapid development highway and realization of road safe motion. Therefore, based on the water-rich and high-steep cutting slope with K39+165.5~K39+501.5 of Huaixin Expressway in Hunan Province, the deep drainage technology and the stability monitoring of slope were studied in this article.Firstly, the seepage situation of cutting slope groundwater is simulated and analyzed with the finite element software ANSYS. Comparing and analyzing the seepage field distribution of setup plan for hole diameter, hole long, hole distance to different drainage holes, it gets that the incidence and effect for changes of hole diameter, long hole, hole distance to drainage seepage field distribution. Combined with the real project, it discusses the distribution of slope seepage field under drainage holes laying double row along elevation, and draws that drainage holes laying multi-row along elevation can significantly improve drainage effect. So it determines the design project for drainage curtain of water-rich and high-steep cutting slope. At the same time, on the basis of the drainage pipe technology at home and abroad, according to the safe, economic and rational principles, a deep drainage hose with spring framework seepage skeleton is improved and designed.Then, through the geological prospecting and the hydrological conditions survey in the real engineering, combined with the results of drainage pipes with finite element analysis, the specific buried project of deep drainage pipes is identified. Moreover, according characteristics of deep drainage, corresponding construction technology is established: measurement hole arrangement→circulation drilling→drilling taken sets drawn→installation of deep water pipes→shift and future work, and the control requirements of construction technology is determined. Compared to the anchor frame beam protective technology, the deep drainage technology on protection mechanism is more rational, construction technology is more simple, construction costs is also greatly reduced. It provides a reference for similar projects.Finally, slope surface deformation and internal displacement are monitored by using GPS and inclinometer. Monitoring results for many times in 18 months are analyzed. The largest surface deformation is 41.4 mm, and the largest internal deformation is only 10 mm, all are less than the first order of allowing deformation 123.75 mm of 0.0025h (h is the height of slope). Slope stability is got, and it is further validated the slope has a good stability after the deep drainage treating.In brief, the research of deep drainage technology has very important theoretical, practical significance and engineering application value for the treatment of water-rich and high-steep cutting slope.