In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore depo...In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore deposit and shale gas geology,3 D predictive modeling of concealed resources,and geological engineering.In geophysics,world-class progress was achieved in the development,data processing,equipment,and scientific survey of electromagnetic method in onshore and offshore environments and the tectonic evolution of the Tibetan Plateau.Especially,advanced wide-field electromagnetic exploration method and equipment as a highlight technique won the first prize of National Science and Technology Invention of China.In ore geology,progressive and complex characteristics of most nonferrous ore deposits and the geodynamic relationship between crust-mantle reaction and mineralization in south China were revealed.Progressive metallogenic models of certain typical ore deposits were established based on the study of fluid inclusion and geochemistry.According to characteristics of complex metallogenic system of polygenetic ore deposit,key ore-controlling factors were found and summarized.The investigation on unconventional resources advanced China’s shale gas resource evaluation system.In 3 D predictive modelling of metallogenic,a large-scale location prediction model was established for exploration of crisis mines and concealed ore deposits.Our developed 3 D predictive modeling techniques for concealed orebodies were widely used to explore deep mineral resources in China.In geological engineering area,the key technologies for deep drilling into complex formations were developed.Especially the drilling fluid and tools were utilized in the fieldwork.The rock and soil mechanics analysis method and anchor technologies were also established and applied to engineering practice.展开更多
Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This st...Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This study took the Wudong coal mine in Xinjiang province of China as a typical case. The gas occurrence of the coal seam and the pressure-relief range of the surrounding rock(coal) were studied by experiments and numerical simulations. Then, a new method to calculate the gas emission quantity for this special geological condition was provided. Based on the calculated quantity, a further gas drainage plan, as well as the evaluation of it with field drainage data, was finally given. The results are important for engineers to reasonably plan the gas drainage boreholes of steeply inclined and extremely thick coal seams.展开更多
After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation （WSDC）. To quantify the rate of change of rock mec...After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation （WSDC）. To quantify the rate of change of rock mechanical properties, samples from the Longtan dam area were measured with uniaxial compression tests after different numbers （1, 5, 10, 15, and 20） of simulated WSDC cycles. Based on the curves derived from these tests, a modified Hock- Brown failure criterion was proposed, in which a new parameter was introduced to model the cumulative damage to rocks after WSDC. A case of an engineering application was analyzed, and the results showed that the modified Hock-Brown failure criterion is useful. Under similar WSDC-influenced engineering and geological conditions, rock mass strength parameters required for analysis and evaluation of rock slope stability can be estimated according to this modified Hoek-Brown failure criterion.展开更多
In this paper, the framework and technologic process of engineering geology demonstration information system （EGDIS） of the Bohai oilfield are presented, and the key technologies for system modeling, such as storage...In this paper, the framework and technologic process of engineering geology demonstration information system （EGDIS） of the Bohai oilfield are presented, and the key technologies for system modeling, such as storage and processing technology of multi-source and heterogeneous data, integrated display technology of multi-source information and multiple safeguard system design are studied. EGDIS of the Bohai oilfield is an integrated application system based on the data standardization and digital seabed database, has the function to realize the standardization/conformity, input/output, inquiry and display of the multi-source and heterogeneous data and graphics, and provides multiple comprehensive analysis and application services, which will provide shared and scientific basic data for the marine engineering construction and oilfield engineering safeguard.展开更多
A high efficiency method is very important in geological survey for a new city in China.Geophysical parameters are Measured While Drilling(MWD),and these parameters are processed and explained on the ground,so the met...A high efficiency method is very important in geological survey for a new city in China.Geophysical parameters are Measured While Drilling(MWD),and these parameters are processed and explained on the ground,so the method can replace conventional engineering geological exploration for drilling rock sample.According petroleum engineering MWD,using the different characters of different rock absorbs γ radial,with the method of storing data in hole and explaining data on the ground,engineering geological exploration formation density MWD is researched.The MWD works stabilized,and the performance is good with precise data.展开更多
Assessing subsurface characteristics and imaging geologic features （e.g., faults, cavities, low-velocity lay- ers, etc.） are typical problems in near-surface geophysics. These questions often have adverse geotechni-...Assessing subsurface characteristics and imaging geologic features （e.g., faults, cavities, low-velocity lay- ers, etc.） are typical problems in near-surface geophysics. These questions often have adverse geotechni-cal engineering implications, and can be especially acute when associated with high-hazard structures such as large earthen flood-control dams. Dam-related issues are becoming more frequent in the United States, because a large part of this major infrastructure was designed and constructed in the early- to mid-twentieth century; these dams are thus passing into the latter stages of their design life, where minute flaws that were overlooked or thought to be insignificant in design/construction are now proving problematic. The high-hydraulic heads associated with these structures can quicken degra-dation of weak areas and compromise long-term integrity. Addressing dam-related problems solely with traditional invasive drilling techniques is often inadequate （i.e., lack of lateral resolution） and]or econom- ically exorbitant at this scale. However, strategic geotechnical drilling integrated with the broad utility of near-surface geophysics, particularly the horizontally polarized shear-wave （SH-mode） seismic-reflection technique for imaging the internal structural detail and geological foundation conditions of earthfill embankment dams can cost-effectively improve the overall subsurface definition needed for remedial engineering. Demonstrative evidence for this supposition is provided in the form of SH-wave seismic-reflection imaging of in situ and engineered as-built components of flood-control embankment dams at two example sites in the central United States.展开更多
The constitutive model and equivalent deformation modulus of an arbitrary column in representative elementary volume （REV） of fractured rock mass are derived. The deformation of fractured rock mass is com- posed of ...The constitutive model and equivalent deformation modulus of an arbitrary column in representative elementary volume （REV） of fractured rock mass are derived. The deformation of fractured rock mass is com- posed of the rock part and the fracture part. The elasto-visco-plastic property is considered in this model. For the convenience in engineering practice, the complex elasto-visco-plastic model and its equivalent modulus are degraded, and tbe rock is taken as an elastic body. By statistical analysis of the geometric positions of the column and the fracture, the equivalent modulus of rock mass with arbitrary fractures is obtained.展开更多
文摘In recent decades,colleagues working in the Discipline of Geological Resources and Geological Engineering at Central South University made significant progress in theoretic study and application of geophysics,ore deposit and shale gas geology,3 D predictive modeling of concealed resources,and geological engineering.In geophysics,world-class progress was achieved in the development,data processing,equipment,and scientific survey of electromagnetic method in onshore and offshore environments and the tectonic evolution of the Tibetan Plateau.Especially,advanced wide-field electromagnetic exploration method and equipment as a highlight technique won the first prize of National Science and Technology Invention of China.In ore geology,progressive and complex characteristics of most nonferrous ore deposits and the geodynamic relationship between crust-mantle reaction and mineralization in south China were revealed.Progressive metallogenic models of certain typical ore deposits were established based on the study of fluid inclusion and geochemistry.According to characteristics of complex metallogenic system of polygenetic ore deposit,key ore-controlling factors were found and summarized.The investigation on unconventional resources advanced China’s shale gas resource evaluation system.In 3 D predictive modelling of metallogenic,a large-scale location prediction model was established for exploration of crisis mines and concealed ore deposits.Our developed 3 D predictive modeling techniques for concealed orebodies were widely used to explore deep mineral resources in China.In geological engineering area,the key technologies for deep drilling into complex formations were developed.Especially the drilling fluid and tools were utilized in the fieldwork.The rock and soil mechanics analysis method and anchor technologies were also established and applied to engineering practice.
基金provided by the National Science and Technology Major Project (No. 2016ZX05043-005)
文摘Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This study took the Wudong coal mine in Xinjiang province of China as a typical case. The gas occurrence of the coal seam and the pressure-relief range of the surrounding rock(coal) were studied by experiments and numerical simulations. Then, a new method to calculate the gas emission quantity for this special geological condition was provided. Based on the calculated quantity, a further gas drainage plan, as well as the evaluation of it with field drainage data, was finally given. The results are important for engineers to reasonably plan the gas drainage boreholes of steeply inclined and extremely thick coal seams.
基金supported by the National Natural Science Foundation of China under No. 41630639the National Basic Research Program of China (2014CB744703)+1 种基金Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JQ4014)China Postdoctoral Science Foundation (2016M602743)
文摘After water is impounded in a reservoir, rock mass in the hydro-fluctuation belt of the reservoir bank slope is subject to water saturation- dehydration circulation （WSDC）. To quantify the rate of change of rock mechanical properties, samples from the Longtan dam area were measured with uniaxial compression tests after different numbers （1, 5, 10, 15, and 20） of simulated WSDC cycles. Based on the curves derived from these tests, a modified Hock- Brown failure criterion was proposed, in which a new parameter was introduced to model the cumulative damage to rocks after WSDC. A case of an engineering application was analyzed, and the results showed that the modified Hock-Brown failure criterion is useful. Under similar WSDC-influenced engineering and geological conditions, rock mass strength parameters required for analysis and evaluation of rock slope stability can be estimated according to this modified Hoek-Brown failure criterion.
文摘In this paper, the framework and technologic process of engineering geology demonstration information system （EGDIS） of the Bohai oilfield are presented, and the key technologies for system modeling, such as storage and processing technology of multi-source and heterogeneous data, integrated display technology of multi-source information and multiple safeguard system design are studied. EGDIS of the Bohai oilfield is an integrated application system based on the data standardization and digital seabed database, has the function to realize the standardization/conformity, input/output, inquiry and display of the multi-source and heterogeneous data and graphics, and provides multiple comprehensive analysis and application services, which will provide shared and scientific basic data for the marine engineering construction and oilfield engineering safeguard.
文摘A high efficiency method is very important in geological survey for a new city in China.Geophysical parameters are Measured While Drilling(MWD),and these parameters are processed and explained on the ground,so the method can replace conventional engineering geological exploration for drilling rock sample.According petroleum engineering MWD,using the different characters of different rock absorbs γ radial,with the method of storing data in hole and explaining data on the ground,engineering geological exploration formation density MWD is researched.The MWD works stabilized,and the performance is good with precise data.
文摘Assessing subsurface characteristics and imaging geologic features （e.g., faults, cavities, low-velocity lay- ers, etc.） are typical problems in near-surface geophysics. These questions often have adverse geotechni-cal engineering implications, and can be especially acute when associated with high-hazard structures such as large earthen flood-control dams. Dam-related issues are becoming more frequent in the United States, because a large part of this major infrastructure was designed and constructed in the early- to mid-twentieth century; these dams are thus passing into the latter stages of their design life, where minute flaws that were overlooked or thought to be insignificant in design/construction are now proving problematic. The high-hydraulic heads associated with these structures can quicken degra-dation of weak areas and compromise long-term integrity. Addressing dam-related problems solely with traditional invasive drilling techniques is often inadequate （i.e., lack of lateral resolution） and]or econom- ically exorbitant at this scale. However, strategic geotechnical drilling integrated with the broad utility of near-surface geophysics, particularly the horizontally polarized shear-wave （SH-mode） seismic-reflection technique for imaging the internal structural detail and geological foundation conditions of earthfill embankment dams can cost-effectively improve the overall subsurface definition needed for remedial engineering. Demonstrative evidence for this supposition is provided in the form of SH-wave seismic-reflection imaging of in situ and engineered as-built components of flood-control embankment dams at two example sites in the central United States.
基金Foundation item： the Western Transport Construction Science and Technology Project of the Ministry of Transport of the People＇s Republic of China （No. 2009318000046）
文摘The constitutive model and equivalent deformation modulus of an arbitrary column in representative elementary volume （REV） of fractured rock mass are derived. The deformation of fractured rock mass is com- posed of the rock part and the fracture part. The elasto-visco-plastic property is considered in this model. For the convenience in engineering practice, the complex elasto-visco-plastic model and its equivalent modulus are degraded, and tbe rock is taken as an elastic body. By statistical analysis of the geometric positions of the column and the fracture, the equivalent modulus of rock mass with arbitrary fractures is obtained.
