Cement-stabilized Soil Mechanics Performance Test And Its Engineering Application Research

Urban construction is accelerating,and underground pipe corridors and municipal projects are being carried out in an intense and orderly manner.Due to the poor physical and physical properties of parts of the eastern coastal are as such as Hangzhou,it is often necessary to consider the problems of surface settlement and construction safety when excavating foundation pits or building embankments.Cement-stabilized soil can strengthen the weak soil layer,and effective and reasonable reinforcement measures can prevent these problems in advance and improve the comfort of people's lives.This paper mainly uses the combination of laboratory test and numerical simulation to apply the indoor test results to practical engineering.Laboratory tests include unconfined compression tests,split tests,and semi-circular bend tests.The strength index and fracture parameters under three mechanical states were obtained through experiments.Under the premise of different cement content and different ages,through the fitting of these indicators and parameters,find the law of change.Based on the PLAXIS finite element platform,the numerical simulation analysis of the composite foundation behavior of cement mixing pile under the cement-stabilized soil reinforcement and embankment filling in foundation pit engineering.The main research results are as follows:(1)The relationship between unconfined compressive strength and splitting strength at three ages of 7 days,14 days,and 28 days can be simplified for this formula ft=?fc+?.It can be seen that as the age increases,the slope ? gradually decreases,but it is always around 0.1(2)The fracture energy Gf and fracture toughness KIc of SCB specimens are positively correlated with cement content and age.(3)The relationship between the fracture energy Gf and Gcf in the three ages of 7 days,14 days and 28 days can be simplified by this formula Gf=?Gcf+v.It can be seen that as the age increases,the slope ? decreases gradually,but it is always between 2.6 and 3.7.Overall,they all showed a good linear relationship.(4)The larger the cement content under unfavorable working conditions,the larger the cumulative maximum horizontal displacement of the retaining structure and tends to a certain constant value.(5)The larger the cement content of the cement mixing pile composite foundation under the embankment filling,the higher the safety and tend to a certain constant value.