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Application Research of Selective Flocculant Adopted in the Sand Removing from Shield Slurry
(1 China University of Geosciences, Wuhan 430074; 2 Shanghai Tunnel Engineering Co., Ltd., Shanghai 200232; 3 Wuhan Metro Group Co., Ltd., Wuhan 430079)
Abstract It is an important technology for slurry recycling by sand removal in flowback slurry based on chemical principles and also an active measure to promote tunnelling efficiency and environmental protection. By analyzing the molecular structure characteristics of partially hydrolyzed polyacrylamide (HPAM), it reveals that the ionized group and linear soft chain can selectively capture and coagulate tiny inertia rock debris while the clay is still dispersed in the slurry system. The effect of HPAM selective flocculation is verified by experiments like vertical tube pressure test. And analysis and selection are conducted to this kind of chemical agent by taking molecular weight, hydrolysis degree and fortified concentration as the main controlling factors, providing a new method of sand removal for the slurry used in the Yangtze River-crossing shield tunnel of Wuhan metro line 7.
Abstract：
It is an important technology for slurry recycling by sand removal in flowback slurry based on chemical principles and also an active measure to promote tunnelling efficiency and environmental protection. By analyzing the molecular structure characteristics of partially hydrolyzed polyacrylamide (HPAM), it reveals that the ionized group and linear soft chain can selectively capture and coagulate tiny inertia rock debris while the clay is still dispersed in the slurry system. The effect of HPAM selective flocculation is verified by experiments like vertical tube pressure test. And analysis and selection are conducted to this kind of chemical agent by taking molecular weight, hydrolysis degree and fortified concentration as the main controlling factors, providing a new method of sand removal for the slurry used in the Yangtze River-crossing shield tunnel of Wuhan metro line 7.
WU Xiaoming1 XU Han1 WEI Linchun2 DINA Mulati1 CHENG Guoliang3
.Application Research of Selective Flocculant Adopted in the Sand Removing from Shield Slurry[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(3): 189-192
2020, Vol. 57 