Test on slurry diffusion range of pipe jacking construction based on resistivity method
Synchronous grouting is an important part of pipe jacking construction,and the slurry spreads to the periphery under the action of grouting pressure.If the distribution of slurry in the soil can be observed,the construction parameters can be adjusted reasonably to ensure the effect of drag reduction by grouting.However,in the actual construction,due to the limitations of observation conditions and methods,it is diffi-cult to judge the distribution of slurry in soil.At present,there are few studies and methods on this part.Therefore,this paper introduces a measurement method-high density resistivity method,which can be used to determine the distribution of mud.In order to obtain the diffusion radius of grout in the surrounding soil after synchronous grouting,this paper simulates the construction process of pipe jacking through laborato-ry tests,and the resistivity distribution of soil before and after grouting is measured by resistivity method,and the diffusion range of grout is obtained by comparing the difference.The results show that the resistivi-ty of soil will change significantly after grouting,and there will be some differences when measuring the re-sistivity of the same soil.The resistivity method can effectively determine the diffusion range of grout after grouting.If the buried depth of the tunnel is different,as long as the drag reduction performance of thixo-tropic mud is good and the grouting pressure is suitable,the stability of grouting effect is good.After the pipe jacking is completed,there will be four areas around the pipe jacking,namely,pure mud zone,slurry-soil mixing zone,main diffusion zone and secondary diffusion zone.
万方数据
维普
