The Theory And Application Study On Deep Mixing Pile Of Sea Embankment Soft Soil

With the popularizing and improving and developing of soil treatment technology, the composite foundation technology is used more and more extensively in area of engineering and science, but the composite foundation theory is faced behind of engineering practice. Author have studied and summed up the engineering practice and theory achievement about composite foundation. Based on comprehensive analyses of the domestic and world related references about composite foundation engineering practice and theoretical research results of composite foundation, The Theory and application study on deep mixing pile of sea embankment soft soil by theoretical analysis, numerical method, methods testing in analogous room and in field, By time rich cement earth in-depth agitation pile in mole soft base punishment design calculation theory.This article first aims at the mole soft base's project characteristic, has analyzed the mole soft base's origin thoroughly, proposed that uses in-depth agitation pile punishment technology. Based on lucubration on the differential equation and load transfer function of pile, the double-broken-line model and hyperbola model were introduced to deduce the analytical solution of load transfer of pile, which can take the character of layered stratum and nonlinear behavior of side resistance into account. Then, the boundary conditions adjustment method was put forward to calculate the load-settlement relationship of pile and carried out the design theory that limit the vertical bearing capacity of pile by settlement on top. Applied it to analyze the test pile and the result indicates that the method could describe the load transfer behavior and load-settlement relationship well.Next, according to in-depth agitation pile compound ground's project characteristic, carries on the discussion to in-depth agitation pile compound ground reinforcement mechanism, has analyzed the cement, the water and the soil body hardening mechanism systematically, the cement reinforcement earth physical mechanics nature as well as the water soil in-depth agitation pile compound ground reinforcement principle. Based on this, has given in-depth agitation pile compound ground punishment saturated soft soil characteristic and the corresponding mechanical control measure.Finally, the in-depth agitation pile compound ground design calculation method was discussed from the supporting capacity, the subsidence, soil bank stability three angle embarking, considered that the project the efficiency and the security, carry on the optimization to in-depth agitation pile compound ground design variable's selection and the supporting capacity computation. And links to the project reality, carries on the discussion to in-depth agitation pile compound ground construction technique and the quality control method, proposed in-depth agitation pile compound ground job practice and the quality detection method. the Analysis of Engineering Example verificate that the method is accurate.