Prof. Jianqiang Xu Profile

Prof. Jianqiang Xu

at China Merchants Chongqing Communications Technology

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Proceedings Article | 16 February 2022 Paper

Mechanical deformation characteristics of corrugated steel pipe culvert under static load

Yu Qi, Xueming Jia, Yongzhen Luo, Zongling Yan, Jianqiang Xu, Jiangbo Xu, Heping Wang

Proceedings Volume 12164, 121641C (2022) https://doi.org/10.1117/12.2628426

KEYWORDS: Analytical research, Stress analysis, Strain analysis, Finite element methods, Wave plates, Sensors

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Compared with the traditional reinforced concrete and masonry culvert engineering, the corrugated steel pipe culvert structure has excellent construction and use performance. There are many mechanical calculation methods for corrugated steel pipe culverts, but there are certain limitations due to different degrees of simplification of the calculation model. Aiming at the stress and deformation characteristics of flexible high-filled corrugated steel pipe culverts under the action of soil filling, this paper selects the trough section in the middle of the culvert axis, the trough section in the middle of the culvert axis, the trough section at the entrance of the culvert, and the culvert through filling and static load tests. The four corrugated steel corrugated pipe culvert sections at the wave crest section of the cave entrance are equipped with strain gauges, earth pressure cells and deformation measuring instruments to study the stress, strain, and displacement mechanical characteristics of the corrugated steel pipe culvert, and obtain the mechanical deformation characteristics of the corrugated steel pipe culvert under static load. The law of deformation. The research results show that: 1) Under the load of the same fill height, the vertical stress of the corrugated steel pipe culvert is smaller than the vertical stress of the soil without a culvert. The pressure is greater than the stress in the soil at the same height; 2) Due to the different directions of the surrounding earth pressure on the pipe culvert during the filling process, tension and compression changes occur at multiple locations, and the strain at the top and waist of the pipe culvert is often larger, so this point is a weak point relative to other measuring points.

Proceedings Article | 10 November 2021 Paper

Study on the effect of reinforcing method of inclined jet grouting pile to control the uneven settlement of soft soil subgrade

Jian Xu, Zhao Yan, Yan Wang, Jin Liao, Zhi Mao, Yang Wang

Proceedings Volume 12050, 120503C (2021) https://doi.org/10.1117/12.2615762

KEYWORDS: Roads, Bridges, Clouds, Head, Soil science, 3D modeling, Numerical simulations, Communication engineering, Composites, Solids

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In order to solve the problem of bridgehead jumping caused by uneven settlement of soft soil subgrade, this paper proposes a non-excavation treatment scheme of inclined jet grouting pile reinforcement based on the demonstration project of eightword section of Xiaojiang Interchange Bridge in G15 Shenhai Expressway, the settlement amount of the eight-character bridge demonstration project and the reinforcement effect of using inclined rotary jet grouting pile to strengthen soft soil subgrade are analyzed and studied based on the FLAC3D three-dimensional numerical simulation. The results show that: The primary settlement is mainly concentrated in the period from 2000 to 2019,and the main consolidation settlement is dominant, the secondary consolidation settlement in the later period has a trend of gradual regional stability; The composite foundation composed of inclined jet grouting pile and silt soil can effectively enhance the anti-deformation ability of the soil under the embankment, and the settlement of the treated area is effectively controlled; The direction of the inclined jet grouting pile along the road length gradually decreases, and the road surface settlement also presents a gentle gradual effect through the zoning and gradual treatment of the soft soil subgrade in the jump-off section at the bridge head. The research results can provide a design basis for the treatment of soft soil subgrade in the demonstration section and have certain theoretical and practical significance.

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