To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring art...To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary(VSAB) is adopted to simulate the radiation damping of their infinite foundations, and based on the Marc software, a simplified seismic motion input method is presented by the equivalent nodal loads. Finally, based on the practical engineering of a RCC gravity dam, effects of radiation damping and construction interfaces on the dynamic characteristics of dams are investigated in detail. Analysis results show that dynamic response of the RCC gravity dam significantly reduces about 25% when the radiation damping of infinite foundation is considered. Hot interfaces and the normal cold interfaces have little influence on the dynamic response of the RCC gravity dam.However, nonlinear fracture along the cold interfaces at the dam heel will occur under the designed earthquake if the cold interfaces are combined poorly. Therefore, to avoid the fractures along the construction interfaces under the potential super earthquakes,combination quality of the RCC layers should be significantly ensured.展开更多
With the continuous development of Chinas social economy, the continuous expansion of transportation and the continuous increase of road vehicles, the quality of Chinas highway engineering construction has also put fo...With the continuous development of Chinas social economy, the continuous expansion of transportation and the continuous increase of road vehicles, the quality of Chinas highway engineering construction has also put forward higher requirements. Combined with previous cases of highway engineering diseases, subgrade settlement diseases, pavement potholes, pavement cracks, honeycomb pits and irregular rutting diseases are common occurrences. These diseases not only greatly shorten the service life of highway engineering projects, but also affect the comfort and safety of peoples vehicles, and bring great traffic pressure to highway engineering. In fact, the common diseases in highway engineering are often closely related to the roadbed and pavement compaction technology and compaction quality of highway engineering. Therefore, in the process of highway engineering project construction, relevant construction departments must optimize and improve the application of driving technology on subgrade and pavement to ensure the final construction quality of highway engineering projects, so as to improve the safety and stability of road vehicles and make support and contribution to the sustainable development of Chinas transportation.展开更多
In today's social development, the construction of public transportation is very critical and plays an important role in the economic development of the region. At the same time, people also have higher requiremen...In today's social development, the construction of public transportation is very critical and plays an important role in the economic development of the region. At the same time, people also have higher requirements for traffic, and require highway engineering to have good performance in terms of comfort and safety. In highway construction, the subgrade and pavement is the key content, and its compaction will directly affect the overall project quality. In this paper, some researches will be carried out on the technical countermeasures of road engineering subgrade and pavement compaction.展开更多
基金Projects(20120094110005,20120094130003)supported by the Research Fund for the Doctoral Program of Higher Education of ChinaProjects(51379068,51139001,51279052,51209077,51179066)supported by the National Natural Science Foundation of China+1 种基金Project(NCET-11-0628)supported by the Program for New Century Excellent Talents in University,ChinaProjects(201201038,201101013)supported by the Public Welfare Industry Research Special Fund Project of Ministry of Water Resources of China
文摘To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary(VSAB) is adopted to simulate the radiation damping of their infinite foundations, and based on the Marc software, a simplified seismic motion input method is presented by the equivalent nodal loads. Finally, based on the practical engineering of a RCC gravity dam, effects of radiation damping and construction interfaces on the dynamic characteristics of dams are investigated in detail. Analysis results show that dynamic response of the RCC gravity dam significantly reduces about 25% when the radiation damping of infinite foundation is considered. Hot interfaces and the normal cold interfaces have little influence on the dynamic response of the RCC gravity dam.However, nonlinear fracture along the cold interfaces at the dam heel will occur under the designed earthquake if the cold interfaces are combined poorly. Therefore, to avoid the fractures along the construction interfaces under the potential super earthquakes,combination quality of the RCC layers should be significantly ensured.
文摘With the continuous development of Chinas social economy, the continuous expansion of transportation and the continuous increase of road vehicles, the quality of Chinas highway engineering construction has also put forward higher requirements. Combined with previous cases of highway engineering diseases, subgrade settlement diseases, pavement potholes, pavement cracks, honeycomb pits and irregular rutting diseases are common occurrences. These diseases not only greatly shorten the service life of highway engineering projects, but also affect the comfort and safety of peoples vehicles, and bring great traffic pressure to highway engineering. In fact, the common diseases in highway engineering are often closely related to the roadbed and pavement compaction technology and compaction quality of highway engineering. Therefore, in the process of highway engineering project construction, relevant construction departments must optimize and improve the application of driving technology on subgrade and pavement to ensure the final construction quality of highway engineering projects, so as to improve the safety and stability of road vehicles and make support and contribution to the sustainable development of Chinas transportation.
文摘In today's social development, the construction of public transportation is very critical and plays an important role in the economic development of the region. At the same time, people also have higher requirements for traffic, and require highway engineering to have good performance in terms of comfort and safety. In highway construction, the subgrade and pavement is the key content, and its compaction will directly affect the overall project quality. In this paper, some researches will be carried out on the technical countermeasures of road engineering subgrade and pavement compaction.
