Method for preparing roadbed material by curing hard rock shield muck

Abstract

The invention provides a method for preparing a roadbed material by curing hard rock shield muck, which particularly comprises the following steps: during shield construction, adding an efficient defoaming agent solution into the shield muck at the front end of a screw conveyor, and uniformly mixing by virtue of a screw conveying process, then respectively spraying a foam inhibitor solution and a tackifier solution into the shield muck at a muck outlet of the spiral conveyor, uniformly mixing by utilizing a belt conveying process, then adding a compound curing agent into the shield muck at the tail end of the belt conveyor, and finally uniformly stirring by utilizing forced stirring equipment arranged in a muck trolley to prepare the roadbed material. A common muck truck is adopted to be transported to the site, and then roadbed construction can be conducted. According to the method, the hard rock shield muck which is high in water content, flowing and rich in foaming agent is prepared into the roadbed material of which the performance and environmental protection both meet the standard requirements by adopting a chemical curing mode and adopting the technical means of foam elimination, bubble inhibition, system tackifying and the like, so that high-value resource utilization of the shield muck is realized.

Description

technical field [0001] The invention relates to the technical field of civil engineering materials and construction, in particular to a method for preparing road base materials by solidifying hard rock shield dregs. Background technique [0002] With the acceleration of China's urbanization process, the urban population and traffic volume have increased sharply. In order to alleviate the problem of urban road traffic congestion, a large number of urban subway projects have been constructed. In subway construction, the shield tunneling method is the preferred construction method, which has the advantages of good safety, short construction period, wide application of geology, small ground impact and high degree of technology. The slag is improved by using a chemical agent, and the resulting slag has the characteristics of large mud content, easy air bubbles and difficult recycling technology. The existing treatment measures are direct transport to landfill or dehydration to l...

AI Technical Summary

Problems solved by technology

In the hard rock geological shield process, a large amount of foaming agent will be used to improve the dregs. The resulting muck has a high moisture content and a high content of residual foaming agent, and the prepared road base material has low strength.

Patent CN109133839A discloses a method for recycling and reusing shield tunneling muck. The technical feature is to use special road mixers, excavators, ALLU and other mixing equipment to mix organic curing agents and design moisture content shield tunneling muck multiple times. To meet the requirements of uniform usability, and then layered rolling backfill the foundation pit, the 7d unconfined compressive strength of the solidified muck soil reaches 1.5MPa, which meets the requirements for backfilling the foundation pit, but the process is complicated, requiring a large number of mixing equipment, and organic solidification The amount of agent used is large, and how to overcome the influence of residual foam agent on the curing effect is not mentioned

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