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Research on Construction Technology and Application of Composite Earth Pressure-Slurry Balance Dual-Mode Shield Machine Push Shield

Author(s)

Leidi Cong*, Guankun Li

Affiliation(s)

Dongguan Enn Gas Co., Ltd. Dongguan, Guangdong, China *Corresponding Author

Abstract

To address the construction challenges of long-distance urban high-pressure gas pipelines crossing complex strata and sensitive structures, this study takes a high-pressure gas pipeline project crossing an intercity railway as the research object, systematically conducting research on the push shield construction technology of composite earth pressure-slurry balance dual-mode shield machines. By analyzing the engineering geological and hydrological characteristics, special requirements for gas pipeline construction, and protection standards for railway structures, the study focuses on optimizing shield machine selection parameters, innovating the construction process system, establishing key parameter calculation models, and constructing a full-process risk prevention and control mechanism. The results show that the 2868-type dual-mode shield machine (with a cutterhead opening rate of 32% and a maximum torque of 848 kN·m) exhibits excellent adaptability in moderately weathered argillaceous sandstone strata (with uniaxial compressive strength ranging from 8.17 MPa to 18.70 MPa). Adopting the combined technology of "double-liquid grouting for end reinforcement - thixotropic slurry drag reduction - double-liquid grouting replacement" and relay jacking with 8 groups of boosters (arranged at intervals of 50 m to 683 m), the construction of a 938-meter-long gas protection pipe is realized with an axis deviation of ≤ ±50 mm and an elevation deviation of ≤ ±30 mm. The established jacking resistance calculation model (Formula 1) and back wall stability check method (Formula 4) effectively ensure construction safety, with the maximum surface settlement controlled at 28 mm and the railway pier displacement at ≤ 1.2 mm, both meeting the protection requirements for sensitive structures. Compared with traditional shield construction, this technology reduces costs by 23%, achieves a daily average tunneling efficiency of 1.8 m, and shortens the construction period by 4%, providing a technical demonstration and quantitative design basis for similar high-pressure gas pipeline crossing projects.

Keywords

Composite Dual-Mode Shield Machine; High-Pressure Gas Pipeline; Long-Distance Construction; Sensitive Structure Protection; Construction Precision Control; Cost Optimization

References

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