Pile Driving Way To Zhanjiang Group Pile Type And The Influence Of Structural Bearing Capacity Of Single Pile In Clay Timeliness

In recent years,a large number of important projects in the Beibu gulf region.Due to Zhanjiang group structural clay widely distributed on the Beibu gulf coast region and it has strong thixotropy,lead to the pile foundation timeliness.Although it has thixotropy of soil and pile foundation timeliness had a more thorough system understanding,but about Zhanjiang group structural clay thixotropy and timeliness of inner link straight pile today remains unresolved.For Zhanjiang structural clay thixotropy and timeliness of the relationship between pile group,based on the structural clay in Zhanjiang group pile foundation pile and soil as the research object,with different pile length,pile type,pile under the way of model pile after pile of 1 times the pile diameter in the soil pore water pressure monitoring,and after completion of the static load test of pile foundation of 1 times pile diameter in the soil of the static cone penetration test.Zhanjiang structural clay after pile group 1 times the pile diameter position of pore water pressure dissipation,undrained shear strength growth rule,and the changing rule of the pile foundation bearing capacity over time.This article main research work and achievements are as follows:1? through the pore water pressure monitoring test and static cone penetration test,to obtain the set of structural clay in zhanjiang pore water pressure dissipation regularity and thixotropic strength recovery.(1)structural clay in zhanjiang group pile foundation,pore water pressure in 8 days after pile driving dispersal,and dissipation of pore water pressure is lower than the pile before the initial pore water pressure value.After suggesting zhanjiang structural clay by disturbance,more conducive to the dissipation of pore water pressure.(2)the thixotropy of significant structural clay in zhanjiang group,but the thixotropy work time under the influence of pile type,pile method.Circular pile soil thixotropy stronger than the pipe pile is better than square piles,static pressure method of sinking pile soil thixotropy is better than piling vibration method.With the increase of pile length,pile soil thixotropy,pile soil by the higher the strength of the thixotropic growth.2?through the pile foundation bearing capacity in the aging test to obtain the set of structural clay in zhanjiang pile foundation bearing capacity changing with the time.(1)structural clay in zhanjiang group pile foundation,the bearing capacity of bearing capacity and restore mainly provided by the pile side friction and pile end resistance contribution is smaller.Pile driving way.(2)the same situation,the pile bearing capacity loss minimum pile-sinking process,pipe pile,round pile is the largest,but the maximum recovery after pile bearing capacity of the circular pile,pile,the pile is minimal.Circular piles on bearing capacity of timeliness,least square pile.Pile length to zhanjiang group structural ultimate bearing capacity of pile foundation in clay timeliness effect significantly,the longer the pile length,ultimate bearing capacity coefficient of timeliness,the greater the ultimate bearing capacity of timeliness,the more obvious.(3)pile under the same type of,in terms of capacity loss and static pressure piles after the ultimate side friction,pile end resistance limit and ultimate bearing capacity is superior to recovery as well as the impact on the bearing capacity of timeliness vibration pile.3?select thixotropy index-thixotropic strength ratio,pile foundation timeliness index,coefficient of bearing capacity of timeliness,thixotropy and timeliness of quantitative relationship between pile is established.Structural clay thixotropy and zhanjiang group pile foundation timeliness,linear relation can be used timeliness thixotropy were positively correlated with the soil pile foundation.