| Side slope is a gneiss,of various forms,which has a natural inclining surface created by its own gravity or human factors.In addition to rainfall,earthquake and other natural factors,daily life in construction,due to complex and special factors such as geological conditions,brings about a lot of difficulties to the investigation.Moreover,it led to unreasonable designs as well as made it unsuitable to carry out construction.There may be various reasons which caused the overall stability of the slope to be damaged,or created the sliding slope phenomenon,called a landslide.Landslides are common,and occur very often,but can cause great harm to human life and property.The steel pipe micro pile is a type of pile with a diameter of less than 300 mm,and the slenderness ratio more than 30.It is made up of micro pile,steel pipe pile and pressure grouting technology.It is constructed by drilling and embedding steel pipe,and pressure grouting.Early steel tubular micropiles are often used for foundation reinforcement.However,in recent years,along with the research and development of this technology,the related engineering and researchers,it has already expanded to landslide control,slope reinforcement,emergency rescue and other engineering fields.Micro steel pile in a particular engineering background,such as mountains,valleys and other complex geology,traffic inconvenience,transportation difficulties,construction equipment,construction difficulties and other circumstances,has some obvious advantages.Some of these being high safety,strong adaptability,simple construction,short construction period,etc.Combining with the monitoring of solid engineering in a loess area,the reinforcement mechanism of steel pipe micro piles is discussed from two aspects: the reinforcement of the pilebody to soil and the influence of grouting pressure on the whole steel pipe micro pile reinforcement system.After induction,the main contents and research results are as follows:(1)Introduced the development history and current development of micro steel pile at home and abroad,analyzed and summarized the main problems of micro steel piles that exist in landslide treatment;(2)The reinforcement mechanism of steel pipe micro pile is summarized from two aspects,including slurry reinforcement for soil,consolidation of slurry and pile soil composite reinforcement,as well as main measures and matters needing attention in construction technology,layout and anti-corrosive treatment of steel tubes.(3)Combining the literature books,the theoretical calculation formula of the steel pipe micro pile is deduced by the two aspects of the single pile resistance analysis and the combined pile resistance analysis.(4)Administering a monitor,following a landslide in the loess area,to record and monitor data analysis,soil pressure on the pile and pile stress,to understand the soil situation before and after the micro steel pile stress distribution mechanism of micro piles in the landslide treatment engineering discussion.(5)Used FLAC3 D software in the same condition,using 4 different grouting pressure to change into piles,and the pile soil affected zone simulation,comparative analysis of the effect of grouting pressure for the entire steel micro pile reinforcement system,summarizes the mechanism and concluded that "micro steel pile reinforcement system with the increase of the reinforcement effect shows that the more the grouting pressure,increases,the more obvious the results.When the grouting pressure reaches a certain level in reinforcement,the effect tends to be stable."... |
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