Construction Technology of Bored Pile in Karst Strong Development and Super Thick Backfill Soil Layer
Aiming at the common problems of bored pile construction in complex strata,taking a project as an example,and based on the construction technology of bored pile in karst strong development and super thick backfill strata,the application analysis is carried out under three different working conditions:super thick backfill stratum,karst strong development stratum,overlying super thick backfill soil,and underlying karst strong development superposition stratum.The results show that this technology can effectively solve many engineering problems,such as difficult pore formation,easy expansion and shrinkage,and difficult perfusion in complex strata,etc.Compared with the traditional treatment process,it can greatly save construction materials and reduce construction costs.It can shorten the construction period of the project by 15 days and save 30 shifts of rotary drilling rig machinery.The filling coefficient of cast-in-place piles can be reduced from 1.5 to 1.05～1.1,saving the comprehensive cost of pile foundation construction by more than 35％.According to the low strain test results,the cast-in-place piles are all class Ⅰ and Ⅱ piles,of which class Ⅰ piles and class Ⅱ piles account for 96.5％and 3.5％ of the number of piles measured,respectively,which fully proves the reliability of the technology.
万方数据
维普
