顶板底板控制
controlling of roof and bottom
鞍座底板断裂
fracture of saddle support mat
白底板病
white abdominall shell disease
white abdominal shell disease
板底滑道
Pole-slide with plank-bottom
板底脱空
hollow board
slab hollow
void under slab
cavity of slab
void beneath slab
void beneath concrete slab
cavity beneath slab
void underneath pavement slab
void at the bottom of slab
empty space beneath the slab
Cavity beneath road slabs
slab suspending
Void beneath Cement Concrete
gapping under pavement slab
Bursted bottom plate
Hole under Concrete Pavement
plat-bottom escape
板底脱空注浆
grouting treatment for void beneath slab
板底弯沉
deflection beneath old concrete slab
板底压浆
cement grout injected under slab