Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata
The construction of pit-in-pit has become increasingly challenging due to the bad geological conditions, particularly in collapsible loess strata. To understand its supporting characteristics and failure mode, it is necessary to study the composite instability mechanism in the loess strata. This res...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/14/7710 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1839616610434809856 |
|---|---|
| author | Jiawei Xu Peilong Yuan Jinxing Lai Peiyao Che Xiangcheng Su Xulin Su |
| author_facet | Jiawei Xu Peilong Yuan Jinxing Lai Peiyao Che Xiangcheng Su Xulin Su |
| author_sort | Jiawei Xu |
| collection | DOAJ |
| description | The construction of pit-in-pit has become increasingly challenging due to the bad geological conditions, particularly in collapsible loess strata. To understand its supporting characteristics and failure mode, it is necessary to study the composite instability mechanism in the loess strata. This research systematically investigates the interacting instability modes of pit-in-pit under a collapsible loess stratum, studies the effects of different reinforcement parameters through physical model tests, analyzes the significance level of each reinforcement factor, and monitors the displacement of the foundation pit during construction in a pit project in Zhengzhou. The result shows that the soil pressure distribution law of the pit in a collapsible loess formation is a complex function of soil parameters, the relative positional relationship between the inner and outer foundation pits, and the time of immersion. The model test shows that the width and depth of reinforced soil have the most significant influence. The reinforcement measures proposed in this paper can effectively control the displacement of each measuring point during the foundation pit excavation, which can provide a reference for similar projects. |
| format | Article |
| id | doaj-art-12f8d4be643a4bdd9076d8cbf84ce2b6 |
| institution | Matheson Library |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-12f8d4be643a4bdd9076d8cbf84ce2b62025-07-25T13:12:08ZengMDPI AGApplied Sciences2076-34172025-07-011514771010.3390/app15147710Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess StrataJiawei Xu0Peilong Yuan1Jinxing Lai2Peiyao Che3Xiangcheng Su4Xulin Su5School of Highway, Chang’an University, Xi’an 710064, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaChangqing Engineering Design Ltd., Xi’an 710000, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaThe construction of pit-in-pit has become increasingly challenging due to the bad geological conditions, particularly in collapsible loess strata. To understand its supporting characteristics and failure mode, it is necessary to study the composite instability mechanism in the loess strata. This research systematically investigates the interacting instability modes of pit-in-pit under a collapsible loess stratum, studies the effects of different reinforcement parameters through physical model tests, analyzes the significance level of each reinforcement factor, and monitors the displacement of the foundation pit during construction in a pit project in Zhengzhou. The result shows that the soil pressure distribution law of the pit in a collapsible loess formation is a complex function of soil parameters, the relative positional relationship between the inner and outer foundation pits, and the time of immersion. The model test shows that the width and depth of reinforced soil have the most significant influence. The reinforcement measures proposed in this paper can effectively control the displacement of each measuring point during the foundation pit excavation, which can provide a reference for similar projects.https://www.mdpi.com/2076-3417/15/14/7710pit-in-pitcompound instability effectcollapsible loess stratasimilar model test |
| spellingShingle | Jiawei Xu Peilong Yuan Jinxing Lai Peiyao Che Xiangcheng Su Xulin Su Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata Applied Sciences pit-in-pit compound instability effect collapsible loess strata similar model test |
| title | Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata |
| title_full | Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata |
| title_fullStr | Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata |
| title_full_unstemmed | Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata |
| title_short | Compound Instability Effect and Countermeasures of Pit-in-Pit in Collapsible Loess Strata |
| title_sort | compound instability effect and countermeasures of pit in pit in collapsible loess strata |
| topic | pit-in-pit compound instability effect collapsible loess strata similar model test |
| url | https://www.mdpi.com/2076-3417/15/14/7710 |
| work_keys_str_mv | AT jiaweixu compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata AT peilongyuan compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata AT jinxinglai compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata AT peiyaoche compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata AT xiangchengsu compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata AT xulinsu compoundinstabilityeffectandcountermeasuresofpitinpitincollapsibleloessstrata |