Enviornmental
| Fri 23 Jan 2026
Beijing, Jan. 23 -- Sinohydro Bureau 14 has submitted a patent application for Top Arch Collapse Cavity Treatment Method for Tuffaceous Volcanic Ash Stratum. This invention was developed by Zhang Canfeng, Guan Qingbo, Mao Wei, Liu Yan, Ma Rong, Ge Yisheng, He Yu, Du Xiaobo, Zhang Jianhong, Wang Zhenchun, Xia Lingang, Zhang Wei a..