CAJ | 학술논문

采用三维数值方法，建立长短桩、变径桩双桩模型，通过大量的数值计算，分析桩顶荷载水平、桩距径比、不同桩长、桩端土模量比及不同桩径对相互作用系数的影响。分析表明，在线弹性变形阶段，桩-桩相互作用系数近似为恒定值，与桩顶荷载水平无关，进入塑性变形之后，则逐渐减小直至极限状态时趋于0；长短桩桩长比及桩端土模量比对短桩-长桩相互作用系数影响大，而对长桩-短桩相互作用系数影响小；变径桩相互作用系数仅与受荷桩桩径有关；并提出了针对长短桩、变径桩的简化计算公式，为实际工程提供参考。
채용삼유수치방법，건립장단장、변경장쌍장모형，통과대량적수치계산，분석장정하재수평、장거경비、불동장장、장단토모량비급불동장경대상호작용계수적영향。분석표명，재선탄성변형계단，장-장상호작용계수근사위항정치，여장정하재수평무관，진입소성변형지후，칙축점감소직지겁한상태시추우0；장단장장장비급장단토모량비대단장-장장상호작용계수영향대，이대장장-단장상호작용계수영향소；변경장상호작용계수부여수하장장경유관；병제출료침대장단장、변경장적간화계산공식，위실제공정제공삼고。
Using 3D numerical simulation method,pile-pile models of long-short piles and piles with dissimilar diameters were built.Then the influences of various parameters on interaction factors were studied by numerical simulation of the pile-pile models,including pile top load,pile spacing,dis-similar lengths,pile end soil modulus ratio and dissimilar diameters.The pile-pile interaction factor remained constant in linear elastic deformation of loading piles,but decreased gradually until close to 0 in plastic state.Pile lengths ratio and pile end soil modulus ratio had more influences on long-short piles’interaction factors than that on short-long piles;the interaction factors for piles with dif-ferent diameters were only affected by the loading pile’s diameter.Lastly,simplified formulas of in-teraction factors between two dissimilar piles were proposed,which are applicable in practical engi-neering.