基坑预应力锚索抗滑桩设计和加固机理及应用分析

Abstract工程硕士学位论文AbstractWith the unceasing development of pre-stressed anchor cable reinforcement technology,which has widely applied in the water resources and hydropower,the railroad,the miningengineering,the urban construction and so on in many project that the slope governance andthe deep foundation pit engineering.It will be mostly a temporary project the hole excavatedfor building foundation supports and protections project,and the project owner would notinvest more funds generally,therefore,the accident sometimes occurs in the deep holeexcavated for building foundation supports and protections project,not only creates the hugeeconomic loss to the society,delays the time limit for a project,but also creates the bad affectsgreatly to the engineering construction.It has been widespread applicated in many waysbecause the pre-stressed anchor cable can improve the rock and soil medium stress state,theintegrity of the rock mass and the stability bearing capacity.But it is still in a backward stagewhen the existing theoretical analysis compared with the actual engineering practice becauseof that the anchoring mechanism is very complex,and it also has many realisticinfluence.Now the theoretical research is short of the change rule of prestressing value whenthe anchor cable locked systematically,especially the anchor of the soil foundation pit and softrock foundation pit.This thesis's uppermost research is as follows:(1)This thesis depends on the project of Guiyang nebula electronics store engineeringprojects.To monitor in the deep hole excavated for building foundation with the domestic andforeign advanced equipment and the technology carries.The monitoring content mainlyincludes the supporting structure system,the gneiss system,the hydraulic system and theenvironment bound and so on.We built the monitoring information communication platform.(2)According to the foundation pit excavation,the construction process of pre-stressedanchor cable,the gneiss nature and the external environment condition,which in combinationwith the pre-stressed change of anchor cable of Guiyang nebula electronics store engineeringprojects and the process of developing of the long-term,short-term monitor data,that definitethe major effect of the loss of prestress .Then based on the existing of prediction model of theloss of prestress,and optimized it according to the scene monitor data to definite thecalculation formula of anchor cable's stress.Further more,we verify the prediction modelaccording to the long-term monitor data.(3)Finally,we use the FLAC3D finite difference software analysis the anchor cablepre-stressed size and the distribution situation in a typical pile anchor system of the Guiyang