CN-122013780-A - Filling process method for filling adjacent water-containing karst cave by using fluid state solidified mudstone slurry

Abstract

The invention provides a filling process method for filling adjacent water-containing karst cave by using fluid-state solidified mudstone slurry, belonging to the technical field of geotechnical engineering and foundation treatment. The invention takes waste mudstone/muck produced by tunnel excavation near a karst area as a solid phase source, and forms a composite curing system with ordinary Portland cement, slag powder, additives and water to prepare fluid curing mudstone slurry, and finally fills and reinforces water-containing karst cave near a pile position by the fluid curing mudstone slurry in a grouting mode to form a continuous and compact curing body in the cave body. The invention effectively solves the problems of non-compaction and discontinuous plugging of the filling body, further induced pile hole instability, discrete bearing capacity, difficult sedimentation control and the like.

Inventors

• WANG QIUSHENG
• XU PENGHAI
• ZHANG RUITAO
• YU KEFAN
• CUI MENGCHAO
• CUI YOUWEN
• WANG HAO

Assignees

• 北京工业大学

Dates

Publication Date

20260512

Application Date

20260304

Claims (5)

1. 1. A filling process for filling the water-contained karst cave near the pile position with the fluid-state solidified mud rock slurry features that the waste mud rock/dregs generated by excavating tunnel near karst region is used as solid-phase source, and a composite solidifying system is composed of ordinary silicate cement, slag powder, additive and water to obtain fluid-state solidified mud rock slurry.
2. 2. A filling process for filling an adjacent water-bearing karst cave with a fluid-state cured mudstone slurry as claimed in claim 1, wherein the mass percentages of the components in the fluid-state cured mudstone slurry are as follows: 50-65% of waste mudstone/muck, 2-7% Of ordinary Portland cement, Slag powder 1-5%, 0.1-0.8% Of an additive, The balance being water.
3. 3. The method of claim 1, wherein the additive is an early strength agent or a thickener.
4. 4. A filling process for filling an adjacent aqueous cavity with a fluid-cured mudstone slurry as defined in claim 1, wherein said consolidation process comprises the steps of: (1) Searching the boundary and connectivity of the hole body by drilling, and defining a processing range and a hole net; (2) Adopting sleeve valve pipes or equivalent grouting structures capable of being re-injected in a segmented mode, combining shell materials and hole sealing sections to form a controlled shell breaking channel, and adapting to high groundwater level rich water environment; (3) The main filling adopts the backward type sectional grouting, and can be combined with a pore sequence structure such as 'alternating of outside and inside, alternate of separating holes and circular grouting', and the like so as to improve filling uniformity and controllability; (4) Under the disturbance conditions of water and water flow, the slurry is used for reducing segregation and scouring loss by depending on the dispersion resistance of the slurry and matching with the sectional re-injection, so as to gradually form a continuous solidified body; (5) The whole process inspection and monitoring and risk management framework proposed by local standards is combined to form an engineering closed loop of process control, result verification and insufficient reinforcement.
5. 5. The method of claim 4, wherein the step (1) includes providing a peripheral controlled edge hole to reduce the risk of slurry run.

Description

Filling process method for filling adjacent water-containing karst cave by using fluid state solidified mudstone slurry Technical Field The invention provides a filling process method for filling adjacent water-containing karst cave by using fluid-state solidified mudstone slurry, belonging to the technical field of geotechnical engineering and foundation treatment. Background Karst region pile foundation construction often encounters complicated unfavorable conditions such as karst cave, erosion crack development, underground water system communication and the like, so that stratum structures and hydrogeological conditions show strong heterogeneity and uncertainty. When cavities or gaps appear in the pile position range, the stability of the hole wall, the safety of hole forming and the quality of subsequent pile forming are more easily disturbed, and the pile position karst cavity can obviously increase the construction risk of the cast-in-place pile and has adverse effects on the bearing performance and the construction safety. Meanwhile, the connectivity of cracks, pipelines and cavities in the karst medium can enable the hydraulic conditions to be changed along with the construction process, and the phenomena of local water gushing, seepage channel redistribution and the like can further amplify the coupling risk between cavity management, pore forming and piling. Therefore, in a water-rich karst site, pile foundation construction is often not only a single pore-forming problem, but also comprehensive engineering of cavity filling and seepage disturbance control. When cavity filling or grouting reinforcement is carried out under the water-rich condition, slurry is easily influenced by water flow disturbance to separate, dilute and diffuse out of control or be flushed away after entering the cavity body, so that the filling body is not compact, and the blocking is discontinuous, and finally the problem chain of 'the cavity is not effectively closed-the hydraulic channel is not reliably cut off-the local weak area still exists' is finally presented. For the injection materials of underwater or dynamic water environment, public researches and reviews generally emphasize that the materials should focus on the key working properties of dispersion resistance, scour resistance, retention rate and the like so as to ensure that the slurry can still maintain integrity in water and form a continuous solidified body in a target area. The performance requirements are different from those of conventional still water or dry grouting, and the evaluation emphasis is that not only pumpability and flowability are required to be considered, but also effective retention and forming capability is required to be maintained under a more severe working condition of 'water flow erosion-particle migration-slurry structural stability'. Therefore, the pile foundation facing the water-containing karst cave is reinforced, and the high-compactness and continuous plugging treatment effect is difficult to obtain by simply relying on common cement paste or low-viscosity slurry materials. In the process control layer, sleeve valve pipes or equivalent sectional grouting structures are often adopted in engineering practice and patent disclosure, and are matched with backward (from bottom to top) sectional grouting to improve the controllability and traceability of 'fixed depth, fixed section and repeatable grouting'. The related technical data clearly indicate that the sleeve valve pipe system can perform repeated sequential injection for multiple times by arranging the valve port with the rubber sleeve on the embedded pipe and opening the valve at a selected depth by means of the packer, thereby being beneficial to implementing fine sectional treatment when the conditions of water enrichment, crack development or hole wall are poor, and the upward sectional grouting thought and the backward sectional grouting thought are also regarded as important organization modes for improving sectional controllability and quality consistency. The method is matched with the method, local engineering standards and technical standards generally emphasize that the construction of pile foundations in karst areas is in accordance with the general principle of 'treatment before construction' on the general risk management framework, a closed-loop control system is constructed through process recording, quality inspection and monitoring, for example, when the conditions of cavities, karst areas and the like exist in the karst areas are specifically proposed by the related technical standards, backfilling or grouting treatment is carried out on the cavities and the karst areas before construction, and requirements on the quality and safety control of the construction process are proposed. Such standard guidelines point to the same conclusion at a methodological level that for water-rich karst, "materials-process-monitoring-re-injection-acceptance" must be orga