Sandstone veins are earthquake-induced unconsolidated sandstones that penetrate into poorly permeable surrounding rocks (mudstone and shale are common) after liquefaction.
Classification by type of rock (mineral): quartz sandstone (quartz and various siliceous rock cuttings account for more than 95% of the total sand-level cuttings) and quartz complex sandstone...
1) Open holes in the corresponding part of the well of the rainwater well. The number and size of the holes are the same as those of the new curbstones; Should not be less than 15 °.
According to the thickness of the road surface layer and the type of the base layer, determine the thickness of the ordinary concrete on the road edge and the porous concrete on the lower layer...
The internal surface of the cement surface structure leaks underwater to the top surface of the base layer, and the interface water between the same surface layer and the base layer (the main source of interface water...
The internal surface of the asphalt surface structure leaks underwater to the top surface of the base layer, and the interface water between the same surface layer and the base layer (the main source of interface water...
The upper layer of curbstone is made of ordinary concrete, and its impermeability can prevent the pavement rainwater from being poured into the pavement structure...