Study And Analysis On The Environmental Impact Of Dynamic Compaction

Dynamic compaction method has the advantages of simple construction technology,wide application scope,remarkable reinforcement effect,fast construction speed and low cost,so it is widely used in the treatment of soft foundation.Dynamic consolidation method,also known as dynamic consolidation method,is a method that compacts the soil layer and strengthens the foundation by using the powerful ramming energy generated by the drop of heavy hammer and the action of shock wave.The construction of dynamic compaction will have a great impact on the environment around the construction site.The huge impact force will cause the vibration of the foundation,which will affect the surrounding structures,affect the work of precision instruments,and endanger human health.The impact of ramming will also cause the ground soil particles to vibrate and diffuse in the air,causing air pollution and harm to the surrounding environment.In addition,the construction of dynamic compaction will also produce huge noise,which will affect the workers on the construction site as well as the surrounding residents and animals.Therefore,based on field test,numerical simulation and model test,this paper studies the environmental impact caused by the construction of dynamic compaction,including vibration,dust and noise,and puts forward the following main conclusions:(1)According to the results of field monitoring and numerical analysis,the variation rules of ground vibration velocity,amplitude and compaction energy during dynamic compaction construction were obtained,and the influence range of vertical and horizontal vibration caused by dynamic compaction construction was determined.According to different types of structures,the safety distance control standard for dynamic compaction in the Yellow River alluvial plain was proposed.(2)Effects of dynamic compaction technology and soil parameters on dust and noise were studied through field and laboratory tests.The results showed that the main sensitivity indexes of dust and noise were affected by compaction energy,shape of rammer,content of fine particles and moisture content of soil.The propagation rule and influence range of dust concentration and noise in dynamic compaction were obtained.(3)On the basis of Plante foundation bearing capacity model,the critical condition of soil particle imbalance under the action of dynamic compaction was studied by referring to the calculation method and hypothesis of circular foundation ultimate bearing capacity,and the dust calculation formula of dynamic compaction method was derived.According to the similarity principle,the model test was designed and the theoretical formula was verified.(4)Based on the analysis of the impact of dynamic compaction on the environment during construction,the design and construction requirements of dynamic compaction based on environmental impact were given,and the engineering measures to control environmental pollution were put forward,so as to reduce the impact of dynamic compaction on the environment and ensure the smooth implementation of dynamic compaction in engineering construction.