| Abstrakt: |
This study aims to address engineering problems such as soil settlement, lateral displacement of enclosure structures, and reduction of groundwater caused by deep foundation pit dewatering, recharge, and excavation in a deep confined water environment in Jinan, Shandong. Based on a typical deep foundation pit project on Jinan rail transit Line R2, this paper adopts a fluid–solid coupling numerical analysis method based on Biot's consolidation theory and simulates the coupling effect of dewatering, recharge, and excavation through alternate iterative calculations of mechanics and seepage combined with the measured data. Changes in soil/rock, enclosure structure, and groundwater under the combined action of dewatering, recharge, and excavation are studied, and the influence of recharge on soil/rock, enclosure structure, and groundwater is analyzed. The results show that under the combined action of dewatering, recharge, and excavation, the surface curve had a typical "groove" shape. The maximum settlement value appeared in the range of approximately 10–20 m behind the underground diaphragm wall. From this range to both sides, the surface settlement decreased rapidly. The maximum surface settlement varied from 24.52 to 78.48% of the excavation depth of the foundation pit. The maximum lateral displacement of the underground diaphragm wall was highly linearly related to the depth of the underground diaphragm wall. The surface settlement caused by dewatering accounted for more than half of the total settlement, and the settlement range caused by dewatering was much larger than that caused by excavation. The lateral displacement of the underground diaphragm wall caused by dewatering was much smaller than that caused by excavation. Under recharge, dewatering had the greatest impact on the groundwater disturbance within 0 to 20 m behind the underground diaphragm wall. During recharge construction, recharge greatly reduced the surface settlement. Additionally, the recharge slightly increased the maximum lateral displacement value of the underground diaphragm wall, which was not conducive to controlling the lateral displacement of the underground diaphragm wall, but the adverse effect was very small, and the maximum lateral displacement value did not exceed the warning value. In addition, recharge effectively supplemented the reduction of groundwater caused by dewatering. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink