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Experimental Study on the Pipe-Soil Interface under the Influence of Pipe Jacking Stagnation Time
Tianliang Li,Wen Zhao,Run Liu,Jianyong Han,Cheng Cheng 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
In the process of long-distance and large-diameter pipe jacking, thixotropic mud is generally injected into the outer surface of the pipe wall to reduce the frictional resistance between the pipe and the soil. The process of pipe jacking may be stopped due to various reasons such as pipe rupture and equipment damage. When the pipe is restarted after being stopped for a period of time, the interface mechanical properties usually change substantially, resulting in a substantial increase in frictional resistance compared to before the stop. However, the mechanical properties and shear mechanism of the pipe-soil interface after jacking is restarted have not been sufficiently investigated. In this paper, a series of gravelly sand-concrete direct shear tests are carried out, in which lubricant is injected into the interface between gravelly sand and concrete, and the effect of construction stagnation time is considered. The mechanical properties of the interface when the concrete pipe is restarted after stagnation is studied by the direct shear tests. The results show that the friction coefficient of pipe-soil interface increases with the stagnation time, which is determined by the thixotropic mud state and the content of gravelly sand involved in shear. In a short period of stagnation, the friction coefficient is determined by the cohesion caused by thixotropic mud and the friction angle produced by the gravelly sand involved in the shearing action. With the increase of stagnation time, the friction angle gradually becomes the decisive factor for the increase of friction coefficient.
The Research on Clustering Algorithm Based on Wax Matching
Zhang Jianyan,Zheng Kun,Li Tianliang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.12
The traditional clustering algorithms need some prior knowledge to determine the initial parameters, and the selection of initial parameters usually will produce great influence on the result of clustering. In order to achieve this purpose, we put forward a new clustering algorithm based on "idea", through optimizing the given data and mathematical model between the adaptive data to model the best match. This algorithm combined with an "idea" algorithm to learn the hybrid model because of the gaussian mixture model can be thought of as a distribution of soft clustering method. This clustering algorithm can overcome the shortcomings of k-means algorithm. Experimental result shows that the algorithm has better clustering effect.
Improvement of comprehensive performance of compound green soil in sponge city
Lei Zhang,Zhicheng Li,Tianliang Yang,Ping Yang 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.5
Large-scale constructions of urbanization increase the impervious areas of city, leading to the urban hydrological effects such as urban waterlogging and rainwater runoff pollution. To this end, China proposed to adopt the measure to build sponge cities. However, the existing green soil cannot meet the comprehensive needs of sponge city. In order to quickly evaluate the comprehensive performance of the soil in sponge city, a comprehensive evaluation criterion was designed, which is related to the characteristics of greening soil permeability, porosity, pH, salinity and fertility. Based on the criterion, a new type of composite green soil was obtained with the silt soil: medium sand: sawdust ratio of 72.5%: 20%: 7.5%. Finally, compared with the existing soil, the new green soil not only meets the comprehensive performance requirements of the green soil’s fertility, pH, permeability and other factors, but also has higher permeability and water retention. It was proved that the new green soil has apparent advantages in the control of rainwater.