For deep rock mechanics and subsurface engineering,accurately characterizing and evaluating rock heterogeneity as well as analyzing the correlation between the heterogeneity and physical and mechanical properties of r...For deep rock mechanics and subsurface engineering,accurately characterizing and evaluating rock heterogeneity as well as analyzing the correlation between the heterogeneity and physical and mechanical properties of rocks are critical.This study investigated the characteristics of acoustic emission signals produced in the process of strong and weak phase damage to rocks.The failure mechanisms of the strong and weak phases were analyzed by performing Brazilian splitting tests on different metagabbros and granites.The strong-weak phase ratio of the rocks and the uniformity of their spatial distribution were characterized.Test results show that as the feldspar develops,the strong-phase ratio of the metagabbro increases.However,the spatial distribution of feldspar minerals in the metagabbro becomes less uniform.The mineral spatial distribution uniformity in the altered granite is good;however,its strong-phase ratio is low.Furthermore,the strong-phase ratio of the typical granite is high;however,its mineral spatial distribution uniformity is poor.Moreover,uniaxial and triaxial test results show that the peak strength and elastic modulus of the rocks are related to the strong-weak phase ratio and mineral spatial distribution uniformity of the rocks.This study provides a new analytical method for the mechanical evaluation of deep rocks.展开更多
An internet-based information and monitoring platform for the specific requirements of geotechnical engineering projects is presented. The platform is based on a hybrid-model approach consisting of a model-based infor...An internet-based information and monitoring platform for the specific requirements of geotechnical engineering projects is presented. The platform is based on a hybrid-model approach consisting of a model-based information management system and a resource management system, the latter also referred to as DCMS. Project key information can be accessed via the main user interface, the 'graphical navigator'. The graphical navigator provides also a direct access to additional information in the DCMS. Prompt reac-tion in exceptional situations as well as in daily work gets an extensive support. In practical applications it has been proven that this platform seems to be an adequate tool especially for risk assessment and management in geotechnical engineering projects. Components and advantages of the platform as well as ex periences from the applications are presented and discussed in the paper.展开更多
基金financially supported by the National Key R&D Program of China (No. 2016YFC0600801)the Major Scientific and Technological Innovation Project of Shandong Province (Nos. 2019SDZY02 and 2019SDZY05)+1 种基金the National Natural Science Foundation of China (Nos. 52074021 and 51774021)China Scholarship Council (No. 202006460024)
文摘For deep rock mechanics and subsurface engineering,accurately characterizing and evaluating rock heterogeneity as well as analyzing the correlation between the heterogeneity and physical and mechanical properties of rocks are critical.This study investigated the characteristics of acoustic emission signals produced in the process of strong and weak phase damage to rocks.The failure mechanisms of the strong and weak phases were analyzed by performing Brazilian splitting tests on different metagabbros and granites.The strong-weak phase ratio of the rocks and the uniformity of their spatial distribution were characterized.Test results show that as the feldspar develops,the strong-phase ratio of the metagabbro increases.However,the spatial distribution of feldspar minerals in the metagabbro becomes less uniform.The mineral spatial distribution uniformity in the altered granite is good;however,its strong-phase ratio is low.Furthermore,the strong-phase ratio of the typical granite is high;however,its mineral spatial distribution uniformity is poor.Moreover,uniaxial and triaxial test results show that the peak strength and elastic modulus of the rocks are related to the strong-weak phase ratio and mineral spatial distribution uniformity of the rocks.This study provides a new analytical method for the mechanical evaluation of deep rocks.
基金the German Research Foundation (DFG) in the frame of the DFG Priority Program "Network-based Co-operative Planning Processes in Structural Engineering" which is gratefully acknowledged here
文摘An internet-based information and monitoring platform for the specific requirements of geotechnical engineering projects is presented. The platform is based on a hybrid-model approach consisting of a model-based information management system and a resource management system, the latter also referred to as DCMS. Project key information can be accessed via the main user interface, the 'graphical navigator'. The graphical navigator provides also a direct access to additional information in the DCMS. Prompt reac-tion in exceptional situations as well as in daily work gets an extensive support. In practical applications it has been proven that this platform seems to be an adequate tool especially for risk assessment and management in geotechnical engineering projects. Components and advantages of the platform as well as ex periences from the applications are presented and discussed in the paper.
