CAJ | 학술논문

圆形沉井和矩形沉井是给排水工程中最为常见的两种沉井，与桥梁工程中的沉井相比，给排水沉井有其独到的结构特点。结合 ANSYS 软件计算结果及现场实测数据，分析了这两种类型沉井在初始下沉工况和下沉到位工况的受力状况。结果表明，自重荷载和局部支撑面积是控制侧壁竖向弯曲的重要因素，竖向刚度的突变导致井壁出现“缩颈”现象，在“缩颈”部位产生应力集中。合理地选择施工工艺，以及加强下沉阶段的施工控制措施可有效改善沉井结构在下沉阶段的受力状况，凸显沉井在受力性能和经济方面的优势。
원형침정화구형침정시급배수공정중최위상견적량충침정，여교량공정중적침정상비，급배수침정유기독도적결구특점。결합 ANSYS 연건계산결과급현장실측수거，분석료저량충류형침정재초시하침공황화하침도위공황적수력상황。결과표명，자중하재화국부지탱면적시공제측벽수향만곡적중요인소，수향강도적돌변도치정벽출현“축경”현상，재“축경”부위산생응력집중。합리지선택시공공예，이급가강하침계단적시공공제조시가유효개선침정결구재하침계단적수력상황，철현침정재수력성능화경제방면적우세。
Circular and rectangular caissons are the most common forms in water supply and sewerage engi-neering.Compared with the deep-water foundations of major bridge,the drainage open caisson has its unique characteristics.Combined the calculated results of ANSYS with the field data,such two types of open caisson sinking in the initial stage and the design position are analyzed in this paper.The results show that gravity load and the area of local support are important factors to control vertical bending stress.Because of the stiffness varying in vertical direction,sidewall appears a necking down phenomenon.It will lead to stress concentration when the caisson sinking to design position.Based on the results,a reasonable construction technology and proper control measures could effectively improve the stress conditions of the caisson structure.With a series of practical guidelines,the open caisson would have a great advantage in mechanical behavior,economically and technically.