Evaluation method of ductility of grouted rock mass for advanced renovation of water-sand mixture inrush area Patent N° US20240159150A1 BEIJING GAOWO LAW FIRM May 26, 2026 Previous patent image Next patent image Evaluation method of ductility of grouted rock mass for advanced renovation of water-sand mixture inrush area View on Google Patents Evaluation method of ductility of grouted rock mass for advanced renovation of water-sand mixture inrush area Download PDF