关键词: 盾构泥浆, 絮凝-固化剂, 宏细观, 无侧限抗压强度, 压滤脱水, 流动化填料

Abstract: Presently, resource utilization efficiency of waste shield slurry is low. Hence, a series of macro and microscale tests (dehydration performance, fluidity, unconfined compressive strength, scanning electron microscopy, and computed tomography scan) on waste shield slurry by adding flocculationsolidification agents are conducted to investigate the possibility of resource utilization of waste slurry. The results show the following: (1) The slurry has a higher dehydration rate after the addition of flocculationsolidification agents, indicating that solidifaction promotes slurry dehydration performance. (2) Treated by ordinary Portlandcementbased flocculationsolidification agent, the moisture content of solidified soil can be greatly reduced under highpressure extrusion, and the unconfined compressive strength after threeday curing becomes greater than 2 MPa, indicating the potential as building materials. (3) The slurry treated by sulphoaluminate cementbased flocculationsolidification agent can be  applicable as controlled lowstrength materials with fluidity ranging from 20 to 30 cm and the threeday undefined compressive strength becoming more than 130 kPa, indicating the potential as fluidity filling materials. The micro test shows mutual improvement of flocculation and solidification.

Key words: waste shield slurry, flocculationsolidification agent, macro and micro, unconfined compressive strength, filtration and dehydration, fluidity test