Zobrazeno 1 - 10
of 13 108
pro vyhledávání: '"TA703-712"'
Publikováno v:
Underground Space, Vol 18, Iss , Pp 218-238 (2024)
This paper focuses on the performance of a braced deep excavation in soft soil based on field monitoring and numerical modeling. Laboratory tests were conducted to determine the soil parameters used in the modified Cam–Clay (MCC) model. Intelligent
Externí odkaz:
https://doaj.org/article/6f204e8bbbdf4378883ac4938af00c80
Publikováno v:
Underground Space, Vol 18, Iss , Pp 295-313 (2024)
Since the classical element model cannot describe the nonlinear characteristics of rock during the entire compressive creep process, nonlinear elements and creep damage are generally introduced in the model to resolve this issue. However, several pre
Externí odkaz:
https://doaj.org/article/cc229b0de3274c7bb54d9fd4e1077c0a
Publikováno v:
Underground Space, Vol 18, Iss , Pp 273-294 (2024)
This study aims to predict the migration time of toxic fumes induced by excavation blasting in underground mines. To reduce numerical simulation time and optimize ventilation design, several back propagation neural network (BPNN) models optimized by
Externí odkaz:
https://doaj.org/article/b263a44d21b8451a956ec7fad73ee218
Publikováno v:
Underground Space, Vol 18, Iss , Pp 239-255 (2024)
Clogging frequently occurs in the cutter head, excavation chamber or screw conveyor when an earth pressure balance (EPB) shield machine is tunneling in soft or silty clay ground with high clay mineral content. In this paper, montmorillonite, kaolinit
Externí odkaz:
https://doaj.org/article/c73e906ff8ea4f8588ba8693e13276cc
Publikováno v:
Underground Space, Vol 18, Iss , Pp 256-272 (2024)
When tunnelling in difficult ground conditions, shield machine would inevitably produce significant ground loss and vibration, which may disturb the ground ahead of the tunnel face. In this paper, discrete element models calibrated by model tests wer
Externí odkaz:
https://doaj.org/article/d5e01cfeb7e84d30b90591fb9d8b9d5d
Publikováno v:
Underground Space, Vol 18, Iss , Pp 187-198 (2024)
This paper develops a new approach for reliability-based design (RBD) of tunnel face support pressure from a quantile value perspective. A surrogate model is constructed to calculate the collapse pressures of the random samples generated by a single
Externí odkaz:
https://doaj.org/article/40bff20511624a6e9d7c0663c1d5e603
Publikováno v:
Underground Space, Vol 18, Iss , Pp 130-150 (2024)
In large-diameter shield tunnels, applying the double-layer lining structure can improve the load-bearing properties and maintain the stability of segmental lining. The secondary lining thickness is a key parameter in the design of a double lining st
Externí odkaz:
https://doaj.org/article/3d5a8bdc12f844848b8396f932240303
Publikováno v:
Underground Space, Vol 18, Iss , Pp 114-129 (2024)
The application of steel strut force servo systems in deep excavation engineering is not widespread, and there is a notable scarcity of in-situ measured datasets. This presents a significant research gap in the field. Addressing this, our study intro
Externí odkaz:
https://doaj.org/article/05e6acf7992447cd948742954af2723a
Publikováno v:
Underground Space, Vol 18, Iss , Pp 151-161 (2024)
High-pressure waterjet-assisted tunnel boring machine (WTBM) is an efficient method for improving the tunneling performance of a tunnel boring machine (TBM) and reducing the wear of its disc cutters in hard rock with high geostresses. Confining press
Externí odkaz:
https://doaj.org/article/ae86ea4d021a413bb88e7ed2cfd64800
Publikováno v:
Underground Space, Vol 18, Iss , Pp 199-217 (2024)
High-speed railway tunnels in various countries have continuously reported accidents of vault falling concrete blocks. Once the concrete block falling occurs, serious consequences follow, and traffic safety may be endangered. The aerodynamic shockwav
Externí odkaz:
https://doaj.org/article/bfa8d2be521447eda845c58206ac04ed