The widespread use of the shield method has raised the
challenge of economically and environmentally managing shield waste muck, which
is a crucial factor limiting its efficient implementation of the shield method.
In this study, a case study is conducted on an airport shield tunnel project at
the Nanning International Airport Comprehensive Transportation Hub Urban Rail
Transit Airport Line, and the feasibility of employing shield waste muck for insitu
absorption in the production of raw materials for karst grouting is discussed.
An L16(44) orthogonal test design is employed to
perform indoor tests on karst grouting materials made from shield muck. Herein,
the impact of various factors on the slurry′s
performance index is examined. The optimal slurry mixing ratio is determined
using the multitargetideal point method. Finally, the
research findings have been successfully put into practice at an engineering
site. The results demonstrate the following: (1) Shield waste muck is a viable
raw material for karst grouting, partially resolving the issue of shield muck
treatment. The resulting grouting material satisfies the safety and efficiency
requirements for subsequent shield tunneling. (2) Under the optimal mixing
ratio (watercement ratio, shield waste muck content,
quicksetting agent content, and expansion agent
content of 1.41, 35.80%, 0.48%, and 0.31%, respectively), the slurry′s performance parameters comply with the karst filling and grouting
standards. (3) Examination of the core sample post grouting reveals a strong
bond between the slurry and karst filling, ensuring a smooth subsequent shield
tunneling process without any unexpected deviations. The grouting and
excavation effects align with expectations, and onsite
preparation of shield waste muck after simple treatment results in material
cost savings of approximately 30%. The economic and environmental benefits of
this approach are noteworthy and merit widespread adoption.
XU Tao
,
YANG Lei
,
GUO Songtao
,
ZHAO Xibin
,
YANG Junsheng
,
ZHANG Cong
. Utilization of Shield Waste Muck in Karst Grouting
Material[J]. Tunnel Construction, 2023
, 43(11)
: 1842
-1852
.
DOI: 10.3973/j.issn.2096-4498.2023.11.004
