In order to study the response mechanism of the overlying strata during the vertical jacking construction in shield tunneling, a full-scale particle flow model of shield shaft vertical jacking in sandy clay was carried out through discrete element method. The rationality of the discrete element model was verified by comparing relevant experimental results. The failure process, failure forms, and changes in jacking resistance of the overlying strata during the jacking process were explored, and an analysis was conducted on the impact of soil thickness and jacking speed on the failure response of soil. The results show that: (1) During the jacking stage, the overlying soil undergoes five stages including form a triangular compression zone→particle bonding failure within the compression zone→expansion of the bonding failure zone→local shear slip failure→the failure surface penetrating the surface. The overlying soil affected by the jacking can be divided into three regions: uplift zone, compaction zone, and crack zone. (2) The resistance at the end of the shaft experiences a significant increase and a gradual decrease, reaching its peak when it reaches h/16, and then gradually decreases and tends to stabilize. The lateral friction of the vertical shaft shows an alternating cycle of increasing first and then decreasing, showing a fluctuating trend. The end resistance is significantly greater than the side friction. (3) When the soil thickness is large, the surface area first affected by the jacking is located on both sides of the vertical shaft, not directly above the vertical shaft. (4) When the jacking speed is high, the overlying soil undergoes "penetration failure" and a narrow shear band appears. (5) The top failure range increases with the soil thickness as a quadratic function, and decreases with the jacking speed as a quadratic function. The end resistance has a linear relationship with the strata thickness and the jacking speed in the same direction.
Xu Shiyang
,
Wang Yizhao
,
Yang Chunshan
,
Zhang Ronghui
. Failure Response Analysis of Overlying Strata with Shield Shaft Vertical Pipe Jacking Based on Discrete Element[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 429
-439
.
DOI: 10.20174/j.JUSE.2024.S1.50
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