CAJ | 학술논문

考虑了混凝土芯砂石桩复合地基中砂石桩的环形排水通道、砂石桩体内的径、竖向渗流和土体施工扰动，并采用桩土共同分担荷载的初始条件，得到了混凝土芯砂石桩复合地基固结问题的控制方程，给出了控制方程的解答；并分别给出了复合地基按应力和按变形定义的总平均固结度，分析了砂石桩桩体渗透系数、芯桩与砂石桩直径比对地基固结性状的影响。结果表明：对于混凝土芯砂石桩复合地基按应力定义的固结度与按变形定义的固结度表达式不同；地基的固结随着砂石桩桩体渗透系数增加而加快；砂石桩直径一定的情况下，固结速率随芯桩直径增大先增大后减小。最后对本文解和以往的两种解做了比较，与以往解相比本文解能够同时考虑环形通道和桩土荷载分担，给出的固结度介于以往的两种解之间。
고필료혼응토심사석장복합지기중사석장적배형배수통도、사석장체내적경、수향삼류화토체시공우동，병채용장토공동분담하재적초시조건，득도료혼응토심사석장복합지기고결문제적공제방정，급출료공제방정적해답；병분별급출료복합지기안응력화안변형정의적총평균고결도，분석료사석장장체삼투계수、심장여사석장직경비대지기고결성상적영향。결과표명：대우혼응토심사석장복합지기안응력정의적고결도여안변형정의적고결도표체식불동；지기적고결수착사석장장체삼투계수증가이가쾌；사석장직경일정적정황하，고결속솔수심장직경증대선증대후감소。최후대본문해화이왕적량충해주료비교，여이왕해상비본문해능구동시고필배형통도화장토하재분담，급출적고결도개우이왕적량충해지간。
Considering the annular drainage section of concrete-cored sand-gravel pile composite foundation, both radial and vertical flows within the sand-gravel pile and soil construction disturbance, using the initial condition of load beared by soil and pile, the governing equations of consolidation problem of composite foundation with concrete-cored sand-gravel piles are derived; the analytical solution to the governing equations is obtained;the overall average degree of consolidation defined in terms of stress and deformation is given;and the influences of several factors, such as the permeability coefficient of sand-gravel piles, diameter ratio of concrete-cored pile and sand-gravel pile on the consolidation of composite foundation are analyzed. The results show that the solution of overall average degree of consolidation in terms of stress is not equal to that in terms of deformation;the greater the permeability coefficient of sand-gravel piles is, the faster the consolidation rate is;under the condition of a certain diameter size of sand-gravel piles, with diameter of concrete-cored pile increasing, the consolidation rate is increased at first and then decreased. Finally, a comparison between the present solution and two previous solutions is made. Compared with two previous solutions,the present solution considers the influences of annular drainage section and load beared by soil and pile together, the overall average degree of consolidation calculated by the present solution is between two previous solutions.