STUDY ON LOAD REDUCTION TEST FOR HIGH-FILL DOUBLE PIPE CULVERT

In order to solve the problem of excessive load on the high-fill culverts，it was conducted a load reduction test of a double pipe culvert by laying single or double-layer EPS with different density and thickness，which was also compared with no EPS board load reduction culvert section. The results show that putting the EPS board on the top of culvert load can be greatly reduced，on the top of culvert vertical earth pressure is just equal to 1 /3 earth pressure on the no load reduction culvert section，and 1 /2 earth column pressure. At the same time，the thicker the laying EPS board，the better the results of the load reduction measure，but decreasing growth rate，load reduction measure with double superposition combination EPS is better than that with single EPS board measure;and，laying EPS board on the top of culvert can improve obvicusly the longitudinal uneven settlement of the culverts. The load reduction measure not only can reduce earth pressure on the high-fil1 culverts，but also prevent their crack，reduce culverts longitudinal concave curve uneven settlement and so on.