中国冶金科工集团有限公司（中文简称中冶集团，英文简称MCC）隶属中国五矿集团公司 ，是中国冶金工业的开拓者和建设者，先后承担了宝钢、鞍钢、武钢、攀钢等国家主要钢铁工业基地的建设任务，为中国冶金工业的发展立下了卓越功勋。作为国际知名承包商，中冶集团在海外各地开辟了广阔市场，足迹遍及五大洲，承建了一批具有重要影响和良好经济效益的项目，受到了项目所在国的好评和欢迎。《财富》世界500强，2013年排名第302位。2016年8月，中国冶金科工集团有限公司在"2016中国企业500强"中排名第60位。
Abstract Laser cladding (LC) is a 3D printing technology that has been increasingly applied to the repair and strengthening of civil engineering structures. However, research on the cyclic performance of laser-clad materials is currently limited. Therefore, 11 specimens were fabricated using LC technology, and experiments were conducted to investigate the mechanical properties and hysteretic behavior of the LC material under different cyclic loading protocols. The experimental results show that laser-clad 316L stainless steel has excellent energy dissipation capacity. LC 316L stainless steel subjected to cyclic loading demonstrates mixed hardening behavior, including isotropic hardening and kinematic hardening, along with a pronounced Bauschinger effect. The envelope curve of 316L stainless steel under cyclic loading differs from its monotonic tensile curve, with the Ramberg–Osgood model proving effective in characterizing the envelope behavior. The elastic modulus of 316L stainless steel initially decreases during the first few loading cycles before stabilizing with accumulated plastic strain. The Chaboche model was implemented to predict the stress–strain response of LC 316L stainless steel, with parameter calibration and subsequent validation confirming the predictive accuracy of the model.
In order to characterize the relationship between the surrounding rock and support structure under the constraint system of swelling support structure,starting from the swelling problem of argillaceous slate,the swelling test,indoor tunnel scale-down physical model test and numerical simulation were utilized to analyze the interaction process between the surrounding rock and supporting structure in argillaceous slate tunnel in water-rich environment,and the mutual feeding model of the swelling and supporting structure of the surrounding rock of argillaceous slate tunnel in water-rich environment was constructed.The results show that:There is a strong positive correlation between the peak swelling stress,strain of argillaceous slate and the free saturated water absorption rate in the water-rich environment.Based on the relationship between the deformation of surrounding rock,supporting structure,tunnel displacement and swelling stress,the ultimate deformation of the tunnel is predicted according to the peak swelling force of the surrounding rock.The interaction between surrounding rock and supporting structure of swelling rock tunnel is a long-term"mutual feeding"process,which reflects the relationship of"promotion and inhibition"between surrounding rock and supporting structure.The swelling of surrounding rock promotes the deformation of the supporting structure,and the supporting structure in turn inhibits the deformation of the surrounding rock.The research results can provide reference for the design and construction of swelling rock tunnel.
