Innovative Design Method of Jet Grouting Systems for Sustainable Ground Improvements

Abstract

The major focus of this study was determining the effectiveness of new construction specifications regarding the method of cement grout injection for the jet grouting system (high-pressure injection stirring method), with the objective of developing a sustainable ground improvement method. The recent innovative jet grouting techniques allow for improvement at middle pressure, but the mud discharge amount is drastically increased. This produces a serious environmental and financial burden during the disposal of mud discharge. This study attempts to develop a sustainable jet grouting method. The simulation model was prepared by the 3D AutoCAD software, and the analysis was conducted using the moving particle semi-implicit method (MPS method). The study focused on the changes that occurred in the mixing ratio of cement slurry and soil due to the changes made in cement milk spraying during the construction phase and compared it with the traditional method of cement milk spraying. All other construction parameters were kept the same for both cases, and the comparison result shows that the modified construction specification provides a denser and larger improved soil body than the traditional method. Furthermore, the density of the number of particles was determined at the upper, middle, and lower portions of the improved body for comparison.

A Comprehensive Review of Sustainable Assessment and Innovation in Jet Grouting Technologies

“…The correlation between construction quality and specifications such as grout quality and volume is also highlighted. Shakya et al [39] demonstrate how adjustments in construction methods, such as the innovative two-step grout spraying technique, can significantly impact the sustainability of jet grouting processes. Figures 15 and 16 show comparative models and results of traditional and modified grouting techniques, respectively, illustrating that even minor adjustments in specifications can result in significant improvements in efficiency and environmental impact.…”

A Comprehensive Review of Sustainable Assessment and Innovation in Jet Grouting Technologies

“…The empirical calculation of mud discharge volume serves not only as a measure of process success, but also as a benchmark for environmental stewardship. According to the guidelines of the Japan Jet Grouting Association (JJGA), the mud discharge volume should be 1.1 to 1.3 times the injected grout volume for sandy and clay soils, respectively [39]. This recommendation emphasizes the importance of precision in material application to reduce waste and increase the efficiency of resource use.…”

Applicability of Numerical Simulation by Particle Method to Unconfined Compression Tests on Geomaterials

“…The precision of a simulation depends on the correct rheology and may require the use of the modified Bingham fluid model to explain the complex rheological behavior [20,21]. Soil is comparable to concrete or mortar in terms of its flowability, and thus, the flowability values of these materials are often used as a reference when determining the plastic viscosity value [22,23]. Aierken et al [22] explained the compatibility of bi-viscosity Bingham fluid in a mortar flow simulation.…”

“…Aierken et al [22] explained the compatibility of bi-viscosity Bingham fluid in a mortar flow simulation. Shakya et al [23] suggested the extrapolation of the flow value vs. plastic viscosity, and the plastic…”