EFFECTIVENESS OF QIANTANG RIVER SILT ON SLURRY AND FILTER CAKE HYDRAULIC PROPERTIES
According to the future plan of Hangzhou,33 crossing river passways will be built under.Hangzhou plans river crossing channels in the future,most of which would use mud water shield tunneling technology that a mud film is formed on the excavation surface to prevent groundwater.In practical engineering,the mixing of Qiantang River silt with mud causes changes in the characteristics of mud and mud film,which may lead to engineering accidents.In response to this phenomenon,this paper systematically explores the impact of Qiantang River silt on mud perfor-mance and mud film permeability characteristics,By analyzing and comparing 16 mud samples under different pres-sures through filtration tests,the correlation parameters of pore ratio permeability coefficient pressure of the mud membrane are obtained,and the permeability coefficient of the mud membrane formed by different mud under differ-ent pressures is calculated.After adding the Qiantang River silt,the viscosity of the mud containing PAA Na(1200)increased by 1.79 times.The average permeability coefficient of the mud film generated by mud containing CPAM increases by 172 times,while the permeability coefficient of mud containing APAM decreases to 1/20 of the original.The addition of Qiantang River silt may result in smaller changes in permeability coefficient under the same pres-sure changes.The aiming to provide scientific basis and solutions for preventing related engineering problems.
qiantang river siltslurry shieldfilter caketunnel face stabilityslurry formula
万方数据
维普
