A large amount of waste slurry is generated during construction, but direct sedimentation and transportation increase construction costs. Improper treatment leads to ecological and environmental pollution. This paper proposes to reuse drilling waste slurry (DWS) as a raw material from a particular project as a grouting material for the real-time capsule grouting technique (RCG) to replace cement grouting material. This not only deals with DWS but also solves the material demand of RCG. An orthogonal experimental design evaluated the performance of the DWS grouting material (DWS-GM). The five levels for the three factors of this experiment were selected, including the fluidity, bleeding rate, initial setting time, and compression strength. A linear model, support vector machines, and neural networks were used to construct regression models, and the effects of different contents of cement, bentonite, and fly ash on the DWS-GM performance were analyzed. The SVM regression model had better performance in describing the laws of fluidity, bleeding rate, and 28-day compressive strength. Furthermore, the optimization model is proposed to obtain the optimal formulation of the DWS-GM under specific constraints. The optimization results show that the optimal formulation of the DWS-GM was 5.6% cement and 6.9% bentonite. The BL, FL, IST, and 28DCS were 1.61%, 21.87 cm, 27.05 h, and 0.22 MPa to meet the functional requirements of the DWS-GM. The above research fully proves the feasibility of the DWS reuse application. We will further reuse DWS to develop other multifunctional material applications in combination with the control needs of RCG technology and technology from other fields.

In this paper, a new type of composite pile called mud absorption (MA) pile was proposed, which is composed of a precast core pile and the paste slurry. Based on the field static load test and three-dimensional coupled discrete element method-finite difference method (DEM-FDM) simulation, the compressive bearing characteristics and load transfer mechanism of the MA pile were investigated. The results indicate the MA pile is the friction pile with higher bearing capacity. The vertical load on the pile top is jointly borne by the core pile and the paste slurry and transferred to the surrounding soil, forming a composite structure with a stiffness gradual that transitions from strong to medium to weak. By monitoring the displacements of the core pile, paste slurry, and the surrounding soil, it has been demonstrated that the core pile and paste slurry work synergistically. This synergy effectively enlarges the pile radius and enhances the bearing capacity of the pile foundation. The effects of paste slurry properties and the ratio of core pile side length to pile diameter on the bearing capacity were finally investigated, providing assistances for the design and application of MA piles.