Fine Particles Of Red Sandstone Weathering Soil Impact Strengthening Research

Gannan region is the area of highly developed red sandstone, there is a large number of fine-grained red sandstone weathering soil on the surface of the mountains in the region, making use of fine-granular red sandstone weathering soil which digged from the surface of mountain in the process of cutting construction to fill the embankment will has a certain practical significance. The dynamic compaction method has received the widespread application by its characteristics of applicable scope, the reinforcement effect remarkable, depth of effective reinforcement, simple of the construction machines and tools, do not consume the precious material even not to consume the material, the cost to below in construction and short of the project time and so on.There are a lot of fine-grained red sandstone weathering soil in Gannan region, therefore, fine-grained red sandstone weathered soil as embankment fill in the high-grade highways will have a very broad application prospects in the Gannan region. In this paper the impact of fine-grained red sandstone weathering soil has a research from theory, indoor test, the scene reinforcement effect as well as numerical simulation analysis.The main subject of this thesis is as follows:(1)The theory of shock wave and the theory of the impact penetration have discussed, analyzed the main factors of the impact of soil reinforcement effect,obtained the theoretical calculation formula of hammer bottom contact stress, load time, disembarkation schedule, biggest displacement quantity and hammer body’s lateral friction in the reinforcement of the impact.(2)The indoor impact test research to fine-grained red sandstone weathering soil has conducted, analysis the change of the subsidence quantity, dry weight density and unconfined compressive strenght under the different impact plan. Qualitative discusses the propagation law of the energy in Soil internal.(3)The test results of fine-grained red sandstone weathering soil of high-filled embankment by different plans of dynamic consolidation are analyzed in the section of highway engineering K21+540-K21+660and K23+780-K23+880in Jiangxi Longna Liren-Yangcun (Jiangxi Guangdong)), determined the feasibility of Dynamic Consolidation program from the surface wave velocity, the degree of compaction, foundation bearing capacity and compressive modulus.(4)Establish the dynamic compaction simulation model to simulate the different plans of dynamic consolidation of fine-grained red sandstone weathering soil considered the change of physical and mechanical properties and the impact of contact stress and processing, the unloading time in different shocks over fine-grained red sandstone weathering soil. Fine-grained red sandstone weathering soil consolidation mechanism was explored in terms of the settlement and dynamic stress, partial results are consistent with the indoor impact test results and on-site dynamic compaction results. The related conclusion obtained in this article will have a certain help for further the research, design and construction in Southern Jiangxi fine-grained red sandstone weathering soil high fill embankment dynamic consolidation.