| China’s geological structure and topography are relatively complex.In recent years,natural disasters have occurred frequently.Landslides and collapses are common,which not only pose a serious threat to people’s lives,but also cause certain damage to the ecological environment.Because we have not taken effective preventive measures in advance for the potential landslide,it may lead to the loss of stability of the mountain slope due to various unfavorable factors such as natural or human activities.In engineering practice,if the support method for unstable and unstable slopes is improper,the instability of the slope will also occur,resulting in engineering accidents.The paper is based on the landslide control project of Yutang Mountain in Yongjia,Zhejiang Province.The project is a slope cutting and land reclamation project.Due to the shortage of construction land,the original natural slope is in a stable state.Due to the later planning to build a high-rise residential area,the original slope needs to be cut and leveled.Scaling down from the top of the slope,the site leveling up to 20～30m free face.In order to prevent the shallow surface landslide and the overall instability of the slope,it is proposed to use lattice anchor+anti-slide pile to protect the whole slope.In this paper,the numerical simulation analysis method is used to study the influence of different factors on slope stability,so as to provide the basis for the optimization of supporting design and determine the reasonable slope reinforcement scheme.The main work and research results are as follows:(1)The geomorphological characteristics,hydrogeological conditions,local meteorological information and engineering site survey data of the slope site were collected,sorted and analyzed,and the slope safety level was determined in combination with relevant specifications.A slope support scheme of lattice anchoring on the slope surface after slope cutting and then adding two rows of anti-slide piles is proposed.(2)FLAC3D numerical simulation software is used to establish the numerical analysis model of typical sections of natural slope,cut slope and reinforced slope.The slope stability under non-rainfall and rainfall conditions is studied by strength reduction method.(3)The single factor sensitivity analysis method is used to study the influence of different design parameters such as lattice bolt length,bolt incident angle,bolt spacing,anti-slide pile length and pile spacing on the slope support effect.The reasonable value range of each support design parameter is given,and the internal force(bending moment,shear force)and displacement of anti-slide pile are analyzed and evaluated. |
PDF Full Text Request