| With the shortage of urban land,the number of buildings on the fill site is increasing,and the number of diseases on the buildings is also increasing.If the safety and use functions of the buildings can be restored through technical measures such as correction and reinforcement,it will not only save investment and reduce resources It is wasteful and has great engineering significance for the development of the construction industry.Therefore,this paper takes the inclination accident of an existing high-rise building on a deep-filled loess site in Xining as the research background,and proposes a comprehensive correction and reinforcement method suitable for deep-filled loess sites.The specific research content is as follows:（1）Through the analysis and summary of many completed correction and reinforcement engineering cases,the reasons for the tilt of the building are analyzed from various aspects such as site survey,design,construction,use and maintenance,and the current common correction methods and the applicable conditions of different correction methods are summarized.With related technical characteristics,the digging hole forming process of the soil digging forced landing correction method is analyzed,and the elastoplastic solution of the digging hole is given.（2）Taking the inclination accident of an existing high-rise building on a deep-filled loess site in Xining as the research background,through the analysis of the geological conditions,use and maintenance of the high-rise building,the reason for the inclination of the high-rise building is obtained and combined with the strata.The lithology and the structural form of the building proposed a comprehensive correction and reinforcement method,that is,"micro-pile rapid settlement prevention and manual digging pile settlement prevention reinforcement and soil excavation and forced settlement correction and heap load pressurization to promote settlement",this method uses micropiles and manual digging piles are used to stop the settlement and reinforcement of inclined buildings.After the building is stabilized,select suitable locations to drill and dig out the soil and pile up and pressurize,and perform forced landing on the inclined buildings to correct the deviation,and finally control the deformation of the building to the standard within the allowable range,achieve the purpose of correcting deviation.（3）The comprehensive rectification and reinforcement method of"micropile quick settlement prevention and manual digging pile settlement prevention and reinforcement and soil excavation and forced settlement and pile load pressure to promote settlement"comprehensive correction and reinforcement method proposed in this paper is used to carry out reasonable correction and reinforcement design,construction and dynamic monitoring of the high-rise building,its maximum tilt rate decreased from 10.95‰and stabilized to 2.13‰,meeting the relevant requirements of the specification.The engineering example proves that the comprehensive correction and reinforcement method is feasible in the treatment of inclined buildings on deep-filled loess sites,and it provides engineering practical experience for reference in the correction and reinforcement of deep-filled loess sites.（4）Since the micro-pile plays an important role in the rapid settlement of inclined buildings in the comprehensive correction and reinforcement method of"micropile quick settlement prevention and manual digging pile settlement prevention and reinforcement and soil excavation and forced settlement and pile load pressure to promote settlement"through the indoor model test of the micro-pile,the single pile bearing characteristics of the micro-pile with different pile diameters under the action of vertical load in the deep filled loess site were studied,and the numerical model of the micro-pile was established by FLAC3D software,and the pile diameter and pile diameter were explored.The influence of length on the bearing capacity of a single pile.The research shows that the Q-s curve of the pile shows a steep drop;the vertical bearing capacity of the pile increases with the increase of the pile diameter;the axial force of the pile body gradually decreases with the increase of the depth;the side friction resistance of the pile basically increases first with the increase of the depth then it gradually decreases;the larger the pile diameter,the closer the load sharing percentage between the pile side friction and the pile tip resistance;the micro-pile has a higher vertical bearing capacity;increasing the length and diameter of the micro-pile can improve the micro-pile the vertical bearing capacity of the pile.It provides theoretical support and practical experience for the selection of micro-pile in the comprehensive correction and reinforcement method. |
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