The deep roadway with broken surrounding rock has problems such as insufficient strength of surrounding rock, serious floor heave, etc.It is urgent to 48-59-1204 strengthen the surrounding rock with effective support means.With the help of COMSOL numerical simulation software, the paper constructs the grouting diffusion model of roadway coupling gr
Undang-Undang RI No.5 Tahun 1999 Tentang Larangan Praktek Monopoli Dan Persaingan Usaha Tidak Sehat merupakan pedoman bagi pelaku usaha untuk menjalankan usahanya agar terciptanya persaingan usaha yang kondusif dan sehat.Dalam implementasinya, peraturan tersebut belum ditaati oleh seluruh pelaku usaha.Terbukti dengan adanya praktek kartel garam yan
Currently, more than 30% of the fine dust generated in the Seoul welspun spaces double bedsheet metropolitan area is a pollutant emitted from automobiles such as diesel vehicles, and air pollution caused by this is becoming increasingly serious.In addition, the importance of electric vehicle distribution is increasing due to the strengthening of in