000			02569aab a2200265 4500
008			231115b20232023|||mr||| |||| 00| 0 eng d
022			_a0733-9364
100			_aWu, Shengzhi _9878916
100			_aXie, Hongqiang _9878917
100			_aZeng, Zhengqiang _9878918
100			_aWang, Mingnian _9878919
100			_aZhao, Honghai _9878920
100			_aLiu, Yue _9496910
245			_aInfluence of Pea-Gravel Layer on Segment Ring Support Performance in Shield TBM Tunnels: A Discrete-Continuous Coupling Simulation and Model Test
300			_a1-18 p.
520			_aIn shield tunnel boring machine (TBM) tunnel construction, grouted pea gravel is used to fill gaps between the surrounding rock and segment rings, acting as a connecting layer that significantly impacts the support performance of the segment ring. This study first obtained the mechanical parameters of pea gravel through experiments, followed by an in-situ investigation to analyze the stress and surface settlement law of the segment ring during TBM construction. A discrete-continuous coupling model was then employed to examine the load transfer process at the micro level between the surrounding rock, pea gravel, and segment ring. Finally, physical model tests were conducted to compare the stress characteristics of the segment ring under different states of pea gravel during continuous loading. The findings reveal that loose pea gravel fails to sufficiently transfer the surrounding rock load to the segment ring, resulting in inadequate support and continuous surface settling until the pea gravel is consolidated. The degree of compression of loose pea gravel directly affects the contact force acting on the segment ring and its supporting effect on the surrounding rock. Moreover, the ultimate bearing capacity of the segment decreases when the pea gravel is loose. The state change of pea gravel resulting from grouting plays a crucial role in the supporting effect of the segment ring; thus, simultaneous grouting is necessary during tunnel construction in unstable strata or insufficient pea gravel filling.
650			_aShield tunnel Boring Machine (TBM) _9878921
650			_aPea Gravel _9878922
650			_aSegment Ring _9878923
650			_aSupport Performance _9878924
650			_aGrouting _985955
773	0		_tASCE: Journal of Construction Engineering and Management _dReston,Virginia, U.S.A : American Society of Civil Engineers/ American Concrete Institute _x07339364
856			_uhttps://doi.org/10.1061/JCEMD4.COENG-13512
942			_2ddc _n0 _cART _o14993 _pMr. Muhammad Rafique Al Haj Rajab Ali (Late)
999			_c814332 _d814332