Research On Consolidation Rules Of Silt Soil At Different Depths With Impact Load

Static and dynamic drainage consolidation method has been developed to be a new technology of soft foundation treatment in recent years. It has been used more in engineering practice. The treatment on the soft soil with a small investment, quick, and other advantages is welcome. However, compared with the engineering practice is still lagging behind in theory. Explore or verify "instant impact incompressible water column depth of the load can pass,""wallop soft foundation under cover layer can produce residual force to maintain consolidation" and other possible rapid reinforcement mechanism until the establishment of appropriate design theories and formulas for soft soil mechanics development and ultra-soft foundation of the Act is to provide a basis for scientific applications academia and industry attention and expectations. Meanwhile, to further understand the soft soil, especially silt and other ultra-soft soil under impact loading and static force when its mechanical response and static and dynamic consolidation rules help promote drainage consolidation method dealing with such soft ground theory.Objective of this study is to implement the relevant controlled trials, combined with in-situ monitoring, theoretical analysis, numerical simulation integrated approach, discover or verify the static action with the media and with the structural properties of ultra-soft soil consolidation coupling effects. Advance on drainage consolidation method static and dynamic understanding of the mechanism for the corresponding design theory and formulas provide the basis for the establishment.Mainly relying on static and dynamic laboratory tests true triaxial test equipment, using the latest international cooperation capacity SPAX-2000improved static and dynamic true triaxial equipment, with arbitrary path, manual control, you can simulate the actual state of high impact strength, and with the most advanced sensor technology and other test conditions.The main research contents and results are as follows:1, An overview of static and dynamic drainage consolidation method of reinforcing mechanism, tamping energy has an important influence of Rayleigh wave;2, Using SPAX-2000improved static and dynamic true triaxial testing system, carried out under the force of impact and static drainage consolidation of silt soil. Static and dynamic drainage consolidation method simulated various conditions:confining pressure (different depths), the impact of load frequency, comparative study on impact and static joint action of soil pore water pressure, deformation and strength characteristics change.Confining pressure effect:With the increasing confining pressure, pore water pressure, migraine stress also increases; axial strain increment, the shaft will reduce the amount of strain accumulation; volumetric strain increment, the body will increase the amount of strain accumulation.Frequency effect:With the impact load frequency reduced, while the role of prolonged, pore water pressure, deviatoric stress, axial strain increment, axial strain accumulation, physical strain increment will be increased.3, Mainly based on rheological properties of ultra-soft soil characteristics and impact loads, the establishment of a post-impact loading can reflect Rheological properties of one-dimensional consolidation Merchant elastic viscoplastic model, and discusses the various parameters of the model the impact of soft soil consolidation process, qualitative results obtained for solving engineering problems like some guidance.4, In the context of certain projects, combined with numerical simulation analysis, found that the role of soil under tamping oval plastic zone, but as time increases, the plastic zone to carry out more and more, soil displacement values increased first large and then decreases, and finally stabilized trend. Soil movement with strike number increased first and then decreased, basically consistent with the actual working conditions. By setting the silt layer of different thickness overlying soil compaction process for simulation results on the thickness of the overburden on the effective depth greater impact. Under certain conditions, the smaller the thickness, the greater the effective depth of the result, and vice versa.