CAJ | 학술논문

以琼州海峡跨海大桥工程为背景，通过4组不同型式深水桥梁基础模型试验，对新型带桩沉箱复合基础的水平向承载性能进行了初步研究。试验得到了4组模型在砂性土层中的Q-s曲线及水平向极限承载力，并对复合基础在各级水平荷载下的桩身弯矩和剪力进行了详细分析，同时对沉箱-桩荷载分担比展开了讨论。试验结果表明：当增加裙边、钢管桩、或同时增加钢管桩和裙边后能够使单体沉箱基础的水平向极限承载力分别提高1.2倍、1.6倍和2.0倍；桩身最大弯矩点均出现在桩身中部即泥面下约0.5 m处。水平荷载主要由上部沉箱基础及桩身中上部土体承担，钢管桩桩顶与沉箱连接部位出现最大剪力，在实际工程中应在此处采取加固措施。研究成果可为这一新型深水桥梁基础的推广应用提供诸多有益参考。
이경주해협과해대교공정위배경，통과4조불동형식심수교량기출모형시험，대신형대장침상복합기출적수평향승재성능진행료초보연구。시험득도료4조모형재사성토층중적Q-s곡선급수평향겁한승재력，병대복합기출재각급수평하재하적장신만구화전력진행료상세분석，동시대침상-장하재분담비전개료토론。시험결과표명：당증가군변、강관장、혹동시증가강관장화군변후능구사단체침상기출적수평향겁한승재력분별제고1.2배、1.6배화2.0배；장신최대만구점균출현재장신중부즉니면하약0.5 m처。수평하재주요유상부침상기출급장신중상부토체승담，강관장장정여침상련접부위출현최대전력，재실제공정중응재차처채취가고조시。연구성과가위저일신형심수교량기출적추엄응용제공제다유익삼고。
In this study, four groups of different types of bridge foundation model are tested to research the horizontal bearing behavior of caisson-pile composite foundation in lab based on the Qiongzhou Strait bridge project. The Q-s curve and horizontal ultimate bearing capacity of these four groups of foundations in sandy soil layer are obtained. Pile bending moment and shear force of pile shaft are analyzed in detail. At the same time, the load sharing ratio of caisson and piles is discussed. The results show that the horizontal ultimate bearing capacities of a single caisson foundation are increased by 1.2 times, 1.6 times and 2 times respectively with adding skirts, steel pipe pile, or steel pipe pile and the skirt. The maximum bending moment point is in the middle of the pile shaft, i.e. at about 0.5 m under the mud surface. The horizontal load is borne mainly by the upper caisson foundation and soil layers above the middle upper part of pile. The maximum shear force is found at the joint of pile top of steel pipe and caisson pile, where the reinforcement measures should be taken in practical engineering. The research achievements could provide a better reference for design or construction of caisson-pile composite foundation.