Anchor reinforced vegetation system(ARVS)comprises high performance turf reinforcement mats(HPTRM),vegetation and anchors.It is a new attempt to apply the system in expansive soil slope protection.The goal of this pap...Anchor reinforced vegetation system(ARVS)comprises high performance turf reinforcement mats(HPTRM),vegetation and anchors.It is a new attempt to apply the system in expansive soil slope protection.The goal of this paper was to evaluate the effectiveness of ARVS in protecting newly excavated expansive soil slopes.The field tests on the bare slope,grassed slope and ARVS protective slope were carried out,including natural and artificial rainfall.During the test,the soil water content,soil deformation,and anchor axial force were monitored,and then the slope protection mechanism of ARVS was analyzed.It was found that ARVS can effectively protect expansive soil slopes compared with bare slopes and grassed slopes.The vegetation and HPTRM form a reinforced turf,and the anchors fix it to the slope surface,thus restraining the expansion deformation.The axial force on the anchor of ARVS includes frictional resistance and tensile force transmitted by HPTRM,which is maximum at the early stage of support.The neutral point of the anchor of ARVS moves deeper under atmospheric action,but the vegetation and HPTRM on the slope surface can limit this movement.展开更多
An experimental investigation on the seismic behavior of a type of outrigger truss-reinforced concrete wall shear connection using multiple steel angles is presented. Six large-scale shear connection models, which inv...An experimental investigation on the seismic behavior of a type of outrigger truss-reinforced concrete wall shear connection using multiple steel angles is presented. Six large-scale shear connection models, which involved a portion of reinforced concrete wall and a shear tab welded onto a steel endplate with three steel angles, were constructed and tested under combined actions of cyclic axial load and eccentric shear. The effects of embedment lengths of steel angles, wall boundary elements, types of anchor plates, and thicknesses of endplates were investigated. The test results indicate that properly detailed connections exhibit desirable seismic behavior and fail due to the ductile fracture of steel angles. Wall boundary elements provide beneficial confinement to the concrete surrounding steel angles and thus increase the strength and stiffness of connections. Connections using whole anchor plates are prone to suffer concrete pry-out failure while connections with thin endplates have a relatively low strength and fail due to large inelastic deformations of the endplates. The current design equations proposed by Chinese Standard 04G362 and Code GB50011 significantly underestimate the capacities of the connection models. A revised design method to account for the influence of previously mentioned test parameters was developed.展开更多
With the gradual depletion of shallow geological resources,their development has increased.However,it is difficult to control the stability and bearing capacity of deep-stratum fissure rock bodies under static and dyn...With the gradual depletion of shallow geological resources,their development has increased.However,it is difficult to control the stability and bearing capacity of deep-stratum fissure rock bodies under static and dynamic load coupling.To study the relationship between the mechanical properties of anchor-reinforced fissured rock bodies under static and dynamic loading conditions,this study performed a static compression test and dynamic impact test on anchor-reinforced prefabricated fissured red sandstone with different inclination angles.Research has revealed that under static loading conditions,the mechanical properties of anchor-reinforced specimens are stable,and the peak strength fluctuates between 23-27 MPa.Under dynamic loading conditions,the peak strength and deformation decreased with increasing inclination angle.The peak strength decreased from 47.3 MPa at 15°inclination angle to 35.4 MPa at a 90°inclination angle,and the peak strain and dynamic cut line modulus were 1.28 times and 1.23 times of the static loading,respectively.Under static loading,the specimen cracks mainly developed along the prefabricated cracks to shear damage,and the increase in the inclination angle led to the damage spreading to the specimen ends,forming combined tensile-shear damage.Under dynamic loading,the damage was primarily tensile-shear combination damage parallel to the impact direction.Based on the linear uniaxial strength criterion,a new relationship between dynamic peak strength,strain rate,and static peak strength was established,and the correlation coefficients were 0.90-0.98,indicating a good correlation.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(No.51369006).
文摘Anchor reinforced vegetation system(ARVS)comprises high performance turf reinforcement mats(HPTRM),vegetation and anchors.It is a new attempt to apply the system in expansive soil slope protection.The goal of this paper was to evaluate the effectiveness of ARVS in protecting newly excavated expansive soil slopes.The field tests on the bare slope,grassed slope and ARVS protective slope were carried out,including natural and artificial rainfall.During the test,the soil water content,soil deformation,and anchor axial force were monitored,and then the slope protection mechanism of ARVS was analyzed.It was found that ARVS can effectively protect expansive soil slopes compared with bare slopes and grassed slopes.The vegetation and HPTRM form a reinforced turf,and the anchors fix it to the slope surface,thus restraining the expansion deformation.The axial force on the anchor of ARVS includes frictional resistance and tensile force transmitted by HPTRM,which is maximum at the early stage of support.The neutral point of the anchor of ARVS moves deeper under atmospheric action,but the vegetation and HPTRM on the slope surface can limit this movement.
基金National Natural Science Foundation of China under Grant Nos.51008300 and 51478459the China Postdoctoral Science Foundation under Grant No.2013M540476+1 种基金the Fundamental Research Funds for the Central Universities under Grant No.2012QNA56a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)under Project No.Suzhengbanfa(2014)-No.37
文摘An experimental investigation on the seismic behavior of a type of outrigger truss-reinforced concrete wall shear connection using multiple steel angles is presented. Six large-scale shear connection models, which involved a portion of reinforced concrete wall and a shear tab welded onto a steel endplate with three steel angles, were constructed and tested under combined actions of cyclic axial load and eccentric shear. The effects of embedment lengths of steel angles, wall boundary elements, types of anchor plates, and thicknesses of endplates were investigated. The test results indicate that properly detailed connections exhibit desirable seismic behavior and fail due to the ductile fracture of steel angles. Wall boundary elements provide beneficial confinement to the concrete surrounding steel angles and thus increase the strength and stiffness of connections. Connections using whole anchor plates are prone to suffer concrete pry-out failure while connections with thin endplates have a relatively low strength and fail due to large inelastic deformations of the endplates. The current design equations proposed by Chinese Standard 04G362 and Code GB50011 significantly underestimate the capacities of the connection models. A revised design method to account for the influence of previously mentioned test parameters was developed.
基金supported by the National Natural Science Foundation of China(No.52374121)the National Key R&D Program of China(No.2023YFC2907203)the Science and Technology Research Key Project of Henan Province(242102321165)
文摘With the gradual depletion of shallow geological resources,their development has increased.However,it is difficult to control the stability and bearing capacity of deep-stratum fissure rock bodies under static and dynamic load coupling.To study the relationship between the mechanical properties of anchor-reinforced fissured rock bodies under static and dynamic loading conditions,this study performed a static compression test and dynamic impact test on anchor-reinforced prefabricated fissured red sandstone with different inclination angles.Research has revealed that under static loading conditions,the mechanical properties of anchor-reinforced specimens are stable,and the peak strength fluctuates between 23-27 MPa.Under dynamic loading conditions,the peak strength and deformation decreased with increasing inclination angle.The peak strength decreased from 47.3 MPa at 15°inclination angle to 35.4 MPa at a 90°inclination angle,and the peak strain and dynamic cut line modulus were 1.28 times and 1.23 times of the static loading,respectively.Under static loading,the specimen cracks mainly developed along the prefabricated cracks to shear damage,and the increase in the inclination angle led to the damage spreading to the specimen ends,forming combined tensile-shear damage.Under dynamic loading,the damage was primarily tensile-shear combination damage parallel to the impact direction.Based on the linear uniaxial strength criterion,a new relationship between dynamic peak strength,strain rate,and static peak strength was established,and the correlation coefficients were 0.90-0.98,indicating a good correlation.
