Determining the extent of tunnel loosening zones is a crucial factor in establishing reasonable support parameters. Addressing the challenge of testing tunnel loosening zones, this study focused on the Dongmachang Tunnel No. 1. Seismic wave methods are employed to test the tunnel's surrounding rock loosening zones. The results are processed using the reflection wave method, and the average wave velocity method is proposed as a standard for determining the loosening zone range. Subsequently, the surface wave method is utilized to process seismic wave data, validating the accuracy of the seismic wave method. Furthermore, a more precise range of the surrounding rock loosening zone is determined based on single hole acoustic method, and theoretical calculations. The obtained results align with the loosening zone range as determined by the average wave velocity method. Finally, a novel high-performance concrete lining structure is introduced for rehabilitating tunnel sections with significant deformations. The effectiveness of this new high-performance concrete lining structure is investigated through numerical simulations and on-site application. The study outcomes present new methodologies and technological support for determining tunnel surrounding rock loosening zones.
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http://dx.doi.org/10.1038/s41598-024-83718-4 | DOI Listing |
Sci Rep
January 2025
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
Determining the extent of tunnel loosening zones is a crucial factor in establishing reasonable support parameters. Addressing the challenge of testing tunnel loosening zones, this study focused on the Dongmachang Tunnel No. 1.
View Article and Find Full Text PDFBone Joint J
January 2025
Department of Research, Sint Maartenskliniek, Nijmegen, Netherlands.
Aims: Tibial fixation in revision total knee arthroplasty (rTKA) can present surgical challenges. It has been suggested that appropriate fixation in at least two of the three anatomical zones (epiphysis, metaphysis, and diaphysis) is essential for implant survival. However, supporting clinical data are lacking.
View Article and Find Full Text PDFArch Orthop Trauma Surg
December 2024
Department of Orthopaedic Surgery, Uthumphon Phisai Hospital, Uthumphon Phisai District, Sisaket Province, 33120, Thailand.
Introduction: Short stem total hip arthroplasty (THA) is an alternative to conventional stem, designed to facilitate minimal-invasive surgery, physiological loading and preserve bone stock. However, there is insufficient evidence of the long-term outcomes in patients with osteonecrosis of the femoral head (ONFH). This study aims to analyze the clinical and radiographic results with a minimum follow-up of 10 years.
View Article and Find Full Text PDFActa Ortop Mex
November 2024
Servicio de Cirugía Ortopédica y Traumatología, Hospital General Universitario Gregorio Marañón. Madrid, España.
Introduction: evaluation of predictors of periprosthetic fracture in loosened femoral stems.
Material And Methods: retrospective case-control study comparing aseptic loosened stems in two groups: cases: patients who experienced periprosthetic femoral fracture before replacement could be performed (n = 9). Controls: experienced prosthetic replacement without fracture (n = 19).
Sensors (Basel)
October 2024
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.
TBM has been widely used in underground engineering and construction, but there is no precedent for the application of open TBM in the inclined shafts of coal mines, which brings new challenges to the support system. The distribution of the axial forces on anchors and the range of loosening of the surrounding rock are crucial considerations in tunnel support design. Existing methods for measuring the axial forces in anchors and determining the extent of loosening in the surrounding rock typically remain at the inspection level, lacking long-term and real-time monitoring capabilities.
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