Why didn't Jiujunshan build a palace?

Jiuzhang Mountain belongs to limestone and is easily eroded by wind and rain. According to relevant public information, Jiuzhang Mountain belongs to limestone, which has been eroded by high-altitude wind and rain for a long time and washed away by mountain torrents. Not only did the mountain not be built, but even the original mountain shape has changed greatly, which is not suitable for building palaces. Jiuzhang Mountain is located in the northeast of Liquan County, Shaanxi Province. In the northern part of the vast Guanzhong Plain, there is a mountain range that runs through the east and west. The mountains rise and fall, and the peaks stand across, facing the Qinling Mountains in the south of Guanzhong Plain.