Numerical study on strengthening mechanism of deep soil-rock mixture under group compaction
The reinforcement effect of dynamic compaction is great significance for evaluating the construction quality and ensuring the safety of structures.In this paper,ABA QUS finite element software is used to establish a dynamic compaction model,which fully considers the attenuation of compaction vibration wave and the change of soil-rock mixture mechanical parameters with the number of compaction,and obtains the nonlinear response process of soil-rock mixture caused by compaction.The rationality of the model in this paper is verified by comparing with the measured data.On this basis,square and rhomboid group compaction models are established.The results show that under the action of dynamic compaction,the stress concentration of single point dynamic compaction has a deeper strengthening depth,which is 16.1％and 24.1％higher than that of the two groups,respectively.The maximum settlement of soil and rock fill in the superposition area between tamping points is 12.9％and 27.6％of the maximum settlement under the tamping points of the two populations,respectively.The group compactor has the characteristic of more uniform reinforcement of foundation fill.The parameter analysis shows that both tamping energy and tamping diameter can increase the tamping effect,but the growth rate decreases.The cross-tamping mode has obvious advantages in controlling center point settlement and balancing energy distribution.Rhomboid tamping point arrangement should be used as far as possible under the conditions of engineering geology.
group tamping actionrock-soil mixturenumerical simulationstrengthening depthtamping parameter
万方数据
维普
