超临界流体（SCF）沉降技术是超临界流体技术重要发展之一。自1879年Hannay报道了高沸点固体物质可溶于超临界流体，并在降压时析出的现象后，1984年Krukonis首次提出超临界流体快速膨胀（rapidexpansion of supcrcritical solution，R...超临界流体（SCF）沉降技术是超临界流体技术重要发展之一。自1879年Hannay报道了高沸点固体物质可溶于超临界流体，并在降压时析出的现象后，1984年Krukonis首次提出超临界流体快速膨胀（rapidexpansion of supcrcritical solution，RESS）法，并用此法制备了难粉碎物质的超细微粒。展开更多
By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the ...By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the base course of cement-stabilized gravel. Moreover, with the differential settlement at the bottom of the pavement structure as the constraint condition, a plane finite element model is established, which is used to study the stress variation of different pavement layers in response to the differential settlement of varying magnitudes. It shows that, under the effects of the ground differential settlement, the wearing course is subjected to the tensile stress while the base course to the compressive stress and the maximum additional tensile stress and compressive stress occur in the area of 1 m from the splicing joint between the new and the old subgrade. Plastic deformation develops in both layers when the ground differential settlement reaches 14 cm. When the differential settlement at the bottom of the pavement goes up to 1 cm, the maximum additional stress in the surface of the base course will reach 0. 28 MPa, which surpasses 0.276 MPa that is specified in the current specifications as the maximum splitting tensile strength for cement-stabilized base material.展开更多
文摘超临界流体（SCF）沉降技术是超临界流体技术重要发展之一。自1879年Hannay报道了高沸点固体物质可溶于超临界流体，并在降压时析出的现象后，1984年Krukonis首次提出超临界流体快速膨胀（rapidexpansion of supcrcritical solution，RESS）法，并用此法制备了难粉碎物质的超细微粒。
基金The National Natural Science Foundation of China(No.51008032)the China Postdoctoral Science Foundation(No.2011M501430)the Foundation of Central Universities of Ministry of Education(No.CHD2012JC011,CHD2011JC083)
文摘By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the base course of cement-stabilized gravel. Moreover, with the differential settlement at the bottom of the pavement structure as the constraint condition, a plane finite element model is established, which is used to study the stress variation of different pavement layers in response to the differential settlement of varying magnitudes. It shows that, under the effects of the ground differential settlement, the wearing course is subjected to the tensile stress while the base course to the compressive stress and the maximum additional tensile stress and compressive stress occur in the area of 1 m from the splicing joint between the new and the old subgrade. Plastic deformation develops in both layers when the ground differential settlement reaches 14 cm. When the differential settlement at the bottom of the pavement goes up to 1 cm, the maximum additional stress in the surface of the base course will reach 0. 28 MPa, which surpasses 0.276 MPa that is specified in the current specifications as the maximum splitting tensile strength for cement-stabilized base material.
