The focal mechanism solutions of the M5. 1 Badong earthquake and subsequent 34 aftershocks at ML2. 0 or more were calculated using the P-wave first motion method; the main earthquake was normal fault dip slip type,and...The focal mechanism solutions of the M5. 1 Badong earthquake and subsequent 34 aftershocks at ML2. 0 or more were calculated using the P-wave first motion method; the main earthquake was normal fault dip slip type,and the slip types of the seismogenic rupture surfaces of the subsequent aftershocks primarily include normal dip slip( 14 times),reverse dip slip( 9 times),normal strike slip( 9 times) and reverse strike slip( 2 times). The M5. 1 Badong earthquake activities may be related to the stress adjustment caused by the rise of the groundwater level and the decrease of the frictional resistance between structural planes of rock formations due to the effect of reservoir water penetration,and related to the joint activities of the NE-strike Gaoqiao fault and the near EW-strike Daping fault.展开更多
An M5.1 earthquake occurred in Badong County,only 66 km from the Three Gorges Dam,on December 16,2013. The continuous gravity observation data obtained at Yichang seismostation nearest to the epicenter( 96 km) were an...An M5.1 earthquake occurred in Badong County,only 66 km from the Three Gorges Dam,on December 16,2013. The continuous gravity observation data obtained at Yichang seismostation nearest to the epicenter( 96 km) were analyzed,and it was found that the continuous gravity observation data obtained in this rainy season did not exhibit a characteristic of seasonal change in gravity identical to that in the past years,and thereafter the M5.1 Badong earthquake occurred. Numerical simulation revealed that the water storage and discharge of the Three Gorges reservoir generated seasonal change in gravity,and the changes in atmospheric pressure and gravity load were not the main sources of the seasonal change of continuous gravity observation data whether in respect of magnitude or phase and did not have obvious breaking change on annual variation before the earthquake. Through analysis of the seasonal change data observed on the same site including cavern temperature,rainfall data and global terrestrial water model( CPC) simulated water load,it was thought that,in the observation room with cavern temperature change of only-0.11°C / a at Yichang seismostation,the seasonal change of continuous gravity observation result mainly originated from the seasonal change in rainfall. In the case that the changes in rainfall and its water load did not have evident breaking change on annual variation law before the earthquake,if the M5.1 Badong earthquake was the cause of the breaking change on annual variation law in Yichang this time,then it was believed through analysis of crust expansion ratio that similar anomaly should occur at a crust expansion and compression intersection,no more than 100 km away from the epicenter.展开更多
The cutting slopes in soft rock of redbed appeared in Yichang-Badong highway often suffer from the instability along weak intercalations, so the creep behaviors of weak intercalated soils are crucially important for t...The cutting slopes in soft rock of redbed appeared in Yichang-Badong highway often suffer from the instability along weak intercalations, so the creep behaviors of weak intercalated soils are crucially important for the stability of cutting slopes. Because the deformation of weak intercalated soils is significantly affected by water content due to the strong water sensitivity, it is necessary to study the influence of matric suction on the creep behaviors of weak intercalated soils. In order to find out the unsaturated creep characters of weak intercalated soils, a GDS unsaturated triaxial apparatus was used. Then the triaxial creep experiments on weak intercalated soil samples under varying matric suction were conducted to obtain the unsaturated creep curves. The results show that the weak intercalated soils have obvious creep behaviors, and the creep strain is in nonlinear relationship with stress and time. When the matric suction is constant, a larger deviator stress will lead to a larger creep strain; When the deviator stress is constant, a smaller matric suction will lead to a larger creep strain. Based on the Mesri creep model, an improved creep model for weak intercalated soils under varying matric suction was established, in which the relationship of stress-strain was expressed with a hyperbolic function, and the relationship of strain-time was expressed with power functions in stages. Then an unsaturated creep model including stress-matric suction-strain-time for weak intercalated soils was established based on the power function relationship between matric suction and Ed(a parameter of the improved creep model). The comparison of the calculated values of creep model and the experimental values shows that the creep behaviors of weak intercalated soils can be predicted by the unsaturated creep model by and large.展开更多
By using the landslide risk evaluating model and the advantages of GIS technology in image processing and space analysis,the relative landslide hazard and risk evaluating system of the new county site of Badong is bui...By using the landslide risk evaluating model and the advantages of GIS technology in image processing and space analysis,the relative landslide hazard and risk evaluating system of the new county site of Badong is built up.The system is mainly consisted of four subsystems:Information management subsystem,hazard assessment subsystem,vulnerability evaluation subsystem and risk prediction subsystem.In the system,landslide hazard assessment,vulnerability evaluation,risk predictions are carried out automatically based on irregular units.At last the landslide hazard and risk map of the study area is compiled.During the whole procedure,Matter-Element Model,Artificial Neural Network,and Information Model are used as assessment models.This system provides an effective way for the landslide hazard information management and risk prediction of each district in the Reservoir of Three Gorge Project.The result of the assessment can be a gist and ensure for the land planning and the emigration project in Badong.展开更多
In 1997, mothers of 57 poor families in Chadianzi and Lucongpo townships in Badong County, Hubei Province, became beneficiaries of the Program of Happiness, which is co-sponsored by the China Population Fund, the Chin...In 1997, mothers of 57 poor families in Chadianzi and Lucongpo townships in Badong County, Hubei Province, became beneficiaries of the Program of Happiness, which is co-sponsored by the China Population Fund, the China Family Planning Association and China Population展开更多
基金supported by the Director Foundation of the Institute of Seismology,China Earthquake Adminstration(IS201246114)the Special Fund of China Three Gorges Corporation(SXSN/3354)
文摘The focal mechanism solutions of the M5. 1 Badong earthquake and subsequent 34 aftershocks at ML2. 0 or more were calculated using the P-wave first motion method; the main earthquake was normal fault dip slip type,and the slip types of the seismogenic rupture surfaces of the subsequent aftershocks primarily include normal dip slip( 14 times),reverse dip slip( 9 times),normal strike slip( 9 times) and reverse strike slip( 2 times). The M5. 1 Badong earthquake activities may be related to the stress adjustment caused by the rise of the groundwater level and the decrease of the frictional resistance between structural planes of rock formations due to the effect of reservoir water penetration,and related to the joint activities of the NE-strike Gaoqiao fault and the near EW-strike Daping fault.
基金supported by the Director Foundation of Institute of Seismology,China Earthquake Administration(IS201156069,IS201326123)the National Natural Science Foundation of China(41204058)
文摘An M5.1 earthquake occurred in Badong County,only 66 km from the Three Gorges Dam,on December 16,2013. The continuous gravity observation data obtained at Yichang seismostation nearest to the epicenter( 96 km) were analyzed,and it was found that the continuous gravity observation data obtained in this rainy season did not exhibit a characteristic of seasonal change in gravity identical to that in the past years,and thereafter the M5.1 Badong earthquake occurred. Numerical simulation revealed that the water storage and discharge of the Three Gorges reservoir generated seasonal change in gravity,and the changes in atmospheric pressure and gravity load were not the main sources of the seasonal change of continuous gravity observation data whether in respect of magnitude or phase and did not have obvious breaking change on annual variation before the earthquake. Through analysis of the seasonal change data observed on the same site including cavern temperature,rainfall data and global terrestrial water model( CPC) simulated water load,it was thought that,in the observation room with cavern temperature change of only-0.11°C / a at Yichang seismostation,the seasonal change of continuous gravity observation result mainly originated from the seasonal change in rainfall. In the case that the changes in rainfall and its water load did not have evident breaking change on annual variation law before the earthquake,if the M5.1 Badong earthquake was the cause of the breaking change on annual variation law in Yichang this time,then it was believed through analysis of crust expansion ratio that similar anomaly should occur at a crust expansion and compression intersection,no more than 100 km away from the epicenter.
基金supported by Natural Science Foundation of China (Grant No. 41502278)National Natural Science Foundation of China (Grant No. 41272377)+1 种基金China Postdoctoral Science Foundation funded project (2015M582588)Science & Technology Project of Hubei Traffic and Transport Office of China (2011)
文摘The cutting slopes in soft rock of redbed appeared in Yichang-Badong highway often suffer from the instability along weak intercalations, so the creep behaviors of weak intercalated soils are crucially important for the stability of cutting slopes. Because the deformation of weak intercalated soils is significantly affected by water content due to the strong water sensitivity, it is necessary to study the influence of matric suction on the creep behaviors of weak intercalated soils. In order to find out the unsaturated creep characters of weak intercalated soils, a GDS unsaturated triaxial apparatus was used. Then the triaxial creep experiments on weak intercalated soil samples under varying matric suction were conducted to obtain the unsaturated creep curves. The results show that the weak intercalated soils have obvious creep behaviors, and the creep strain is in nonlinear relationship with stress and time. When the matric suction is constant, a larger deviator stress will lead to a larger creep strain; When the deviator stress is constant, a smaller matric suction will lead to a larger creep strain. Based on the Mesri creep model, an improved creep model for weak intercalated soils under varying matric suction was established, in which the relationship of stress-strain was expressed with a hyperbolic function, and the relationship of strain-time was expressed with power functions in stages. Then an unsaturated creep model including stress-matric suction-strain-time for weak intercalated soils was established based on the power function relationship between matric suction and Ed(a parameter of the improved creep model). The comparison of the calculated values of creep model and the experimental values shows that the creep behaviors of weak intercalated soils can be predicted by the unsaturated creep model by and large.
文摘By using the landslide risk evaluating model and the advantages of GIS technology in image processing and space analysis,the relative landslide hazard and risk evaluating system of the new county site of Badong is built up.The system is mainly consisted of four subsystems:Information management subsystem,hazard assessment subsystem,vulnerability evaluation subsystem and risk prediction subsystem.In the system,landslide hazard assessment,vulnerability evaluation,risk predictions are carried out automatically based on irregular units.At last the landslide hazard and risk map of the study area is compiled.During the whole procedure,Matter-Element Model,Artificial Neural Network,and Information Model are used as assessment models.This system provides an effective way for the landslide hazard information management and risk prediction of each district in the Reservoir of Three Gorge Project.The result of the assessment can be a gist and ensure for the land planning and the emigration project in Badong.
文摘In 1997, mothers of 57 poor families in Chadianzi and Lucongpo townships in Badong County, Hubei Province, became beneficiaries of the Program of Happiness, which is co-sponsored by the China Population Fund, the China Family Planning Association and China Population
