西安市北郊排水工程,在流沙软基上设计、建成拱式桥梁和渡槽近400座,其结构类型有微弯版拱、三铰拱、肋拱、双曲拱、桁架拱,一孔净跨最大达17米。这些建筑物建成运用10多年来,经受过多次洪水考验,至今依然安全无恙。经荷载试验及长期观测资料表明,结构变位很小(仅1/2000左右)。在沙基上采用拱结构,加快了工程进度,节省了大量投资(较原设计梁式结构节省了40多万元)和三材。西安市北郊排水工程,位于渭河漫滩地带,地基地质为流沙软基。根据实测资料,土层为粉细沙淤积质,孔隙率42.4％,持水率29.5％,渗透系数K=4.46～431.2米/昼 In the northern suburb of Xi’an, the drainage project was designed on a soft sand foundation, and nearly 400 arch bridges and aqueducts were constructed. The structure types are micro-bent plate arch, triple hinge arch, rib arch, double arch, truss arch, one hole net Across up to 17 meters. The buildings, which have been built and used for more than 10 years and have undergone many flood tests, are still safe and sound. The load test and long-term observation data show that the structural displacement is very small (only about 1/2000). The arch structure is used on the Shaki, speeding up the project, saving a lot of investment (save more than 400,000 yuan compared with the original beam structure) and the third material. The northern suburb of Xi’an drainage project, located in the floodplain Weihe area, the foundation of soft sand for the quicksand. According to the measured data, the soil layer is silty silt sediment, the porosity is 42.4%, the water holding rate is 29.5%, and the permeability coefficient K is 4.46 ~ 431.2 m / day