Mechanical Behavior of Grouted Fractured Sandy Mudstone Under Different Grouting Pressures: Experimental Investigation and CT-Based In Situ Numerical Modeling
Yuxu Shen, Zhaoyun Chai, Xu Liu, Chang Xiao, Tianyu Li, Xiangyu Liu, Junqing Guo
TL;DR
This study examines how different grouting pressures affect the mechanical properties of fractured sandy mudstone using experiments and CT-based simulations.
Contribution
The study introduces an integrated numerical simulation approach combining CT scanning, in situ modeling, and mechanical analysis for grouted rock structures.
Findings
Grouting pressure of 3 MPa showed the most significant improvement in mechanical properties of fractured sandy mudstone.
Higher grouting pressures caused a shift from brittle to ductile failure modes in the rock samples.
SEM analysis revealed that 3 MPa grouting pressure enhanced rock integrity without causing matrix damage.
Abstract
A numerical simulation methodology integrating “CT scanning—in situ modeling—mechanical analysis” was established, enabling in situ modeling of grout–rock composite structures. The nonlinear enhancement law of grouting pressure on the mechanical properties of fractured sandy mudstone was revealed, and 3 MPa was determined as the optimal grouting pressure. The transition of the rock failure mode from brittle to ductile behavior induced by grouting was elucidated. To investigate the effect of different grouting pressures on the reinforcement of fractured sandy mudstone, grouting tests, mechanical experiments, CT scanning, and SEM analysis were conducted on fractured rock samples. Based on CT data, the precise internal structure of the grouted rock samples was obtained. High-fidelity numerical models were constructed in ABAQUS through image processing and mesh mapping techniques and…
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Taxonomy
TopicsGrouting, Rheology, and Soil Mechanics · Rock Mechanics and Modeling · Geotechnical Engineering and Analysis