Study on Microscopic Roadbed Grouting Mechanism Based on CFD-DEM Coupling Algorithm

Table 3

Number of contact key failures in each monitoring circle.

Grouting pressure	Number of monitoring circles
	Number of broken bonds
	1	2	3	4	5
0.1 MPa	1571	2024	2205	2308	2381
0.15 MPa	2858	3682	3985	4155	4270
0.2 MPa	5863	7522	8098	8399	8575
0.25 MPa	10301	15425	16693	17224	17471
0.3 MPa	12458	29623	33449	34718	35242
0.4 MPa	8496	42214	65550	70423	72009
0.5 MPa	7845	31611	87043	120956	128564