Based on finite difference method and Mohr-coulomb criteria, the numerical model of representative profile of a deep foundation pit was built. The excavation process and soli nailing retaining structure are simulated. The stability of retaining structures which meets the requirement of technical specification is verified by analyzing the displacement and stress. And the force mechanism of soil nailing and concrete surface is studied.
The effect of different curing time on internal structure of high-volume fly ash concrete with HCSA expansive agent is studied, and the analysis of that compactness and endurance of concrete could be improved by HCSA expansive agent which could fundamentally compact the internal structure of high-volume fly ash concrete is performed. The result shows that curing is beneficial to generation of ettringite and could accelerate hydration of concrete with expansive agent; the compactness of cured concrete with HCSA is better than which was not cured. The internal porosity was filled by expansive agent after hydration expansion, and concrete was more dense, leading to that the strength and durability of concrete improved.
Hetaoyuan formation of Palaeogene in Biyang sag experienced the process of sedimentation during the main depressing period. Lithological traps were formed by the Sandstone-conglomerate bodies as favorite targets for oil and gas exploration in the southeast of Biyang sag. In this study, seismic profile, cores and well loggings as main data are used to analyze the micro-facies of subaqueous fan complex system. Methods such as Phasing concertion, spectrum decomposition, and strata slice play important roles in the study of facies evolution and distribution in high-resolution sequence framework of the upper member of the third Hetaoyuan formation. Subsequently, All of the coarse-grained turbid sandstone and the distributary channels sediments are potential reservoirs for oil and gas storage.
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