CAJ | 학술논문

在开挖深度较大时，组合支护结构得到越来越多的应用，但设计中一般是将各种支护结构单独进行分析，没有考虑共同作用。以某深基坑为例，通过FLAC3D建立有限差分模型，分析了土钉、顶撑以及排桩联合支护下深基坑的稳定性，得到排桩水平位移、土钉轴力、支撑轴力的变化规律。研究结果表明：随着开挖的进行，支护结构受力增大，但土钉变化不大；超载使桩身位移变大，地表沉降增大；过大或过小的排桩嵌固深度不利于受力；土钉的长度应合理设置。
재개알심도교대시，조합지호결구득도월래월다적응용，단설계중일반시장각충지호결구단독진행분석，몰유고필공동작용。이모심기갱위례，통과FLAC3D건립유한차분모형，분석료토정、정탱이급배장연합지호하심기갱적은정성，득도배장수평위이、토정축력、지탱축력적변화규률。연구결과표명：수착개알적진행，지호결구수력증대，단토정변화불대；초재사장신위이변대，지표침강증대；과대혹과소적배장감고심도불리우수력；토정적장도응합리설치。
As a new kind of technology in deep foundation excavation, the combined supporting structure is attracting more attentions. However, research of the coupled effect is generally rare. Based on the software FLAC3D , the coupled effect of a deep foundation excavation with combined supporting structure is analyzed. The supporting structure is composed of soil nail, top supports and row piles. The law of the horizontal displacement of piles, the axial force of soil nail and the bracing axial force is obtained. The results show that force of the structure increases as the excavation depth increase, but the axial force of soil nail is observed little variation. The overload would significantly increase the displacement of pile, the surface subsidence and axial force of soil nail. The embed depth of piles should be arranged reasonably to avoid failure.