Research On The Whole Process Treatment And Disposal Of Engineering Mud And Engineering Muck

The large amount of engineering muck and engineering mud produced in China and the low comprehensive utilization rate have become an important environmental problem to be solved in the process of urban development,and its resource utilization is the future development trend.This article studies the source characteristics of engineering mud and engineering muck,and analyzes the production factors of engineering mud and engineering muck.Based on the system modeling method,the article proposes a prediction model for the production of engineering muck and engineering mud,and uses the model to predict the production of muck and mud in actual engineering.It is calculated that the total volume of sand and stone produced by the Hangzhou Boao Tunnel is about 240,000 m3,the amount of dry slag produced is about 130,000 m3,and the amount of soil particles produced is about 280,000 m3.The output of muck in the section between Evening Avenue Station and Chaoyang Station of Changsha Metro Line 5 is about 100,000 m3,and the content of sand and gravel is about 50,000 m3.The accuracy range of the shield mud prediction model is 82.26%-92.42%.The prediction accuracy of the shield mud prediction model is 94.49%.The prediction accuracy of the two models is relatively high.This article analyzes the environmental properties of engineering muck and engineering mud,and the detection indicators include p H,heavy metals,organic matter and so on.The samples were taken from five cities in Changsha,Hangzhou,Zhengzhou,Ningbo,and Shenzhen in the north and south of China.The sample types include all samples of mud and muck.The soil accumulation index method,single-factor pollution index method and Nemero comprehensive pollution index method were used to evaluate the pollution degree of heavy metals in the residue and mud samples.The results showed that the heavy metal content in the residue and the soil background content of the sampling site were relatively large Connection,the Pb element in the Changsha shield soil exceeds the limit.The conclusions drawn by the three heavy metal pollution analysis methods are that the slag soil is less polluted by heavy metals.Only the Pb elements of CT1 and CT3 in Changsha samples are moderately polluted,while the engineering mud is less polluted by heavy metals.On the whole,Nemero's comprehensive pollution index method is more suitable for the evaluation of heavymetals in the muck.The detection results of organic matter show that the mud and muck are not contaminated with organic matter to a very small extent.Quality control analysis of environmental attributes of engineering mud and engineering muck.This article proposes a zero-emissions and resource-based full-process treatment and disposal model to provide a systematic and feasible direction for its resource-based processing.The principle of slag disposal is harmless and resourceful.The slag disposal of the project is completed through the steps of slag slurry,sand and gravel separation,dosing detection,water phase treatment and mud cake treatment.The gravel and mud cakes can be treated as follow-up resources.Taking the Changsha shield muck as an example,the application of the treatment and disposal model in actual engineering was verified.The treatment of engineering mud is mainly based on reduction and resource utilization.The treatment of mud is divided into four parts: mud sand separation,mud water separation,slurry adjustment,and detection.The equipment selection for mud treatment is completed.Take the Boao Tunnel Project in Hangzhou as an example to verify the application of the whole process of mud treatment and disposal.An economic benefit analysis was conducted on the treatment and disposal mode of engineering muck and engineering mud.The calculation result shows that the construction of the Hangzhou Boao Tunnel can produce a direct economic value of about 34.5 million yuan,which is about 12 million yuan less than the original engineering mud treatment method;Changsha City 5 The economic benefit generated by the section between Avenue Station and Chaoyang Station of Line No.2 is about 12.1 million yuan,and it is 8million yuan less than the treatment method of direct export of engineering waste.The entire line is expected to generate billions of economic value.The environmental and social benefits of the treatment and disposal model are analyzed.The two treatment models can realize the zero-emission resource treatment of the entire process of engineering muck and engineering mud,which is conducive to the development of green buildings and construction in China.