An Investigation into Support Interaction of Ground Support Through Numerical Modelling and Laboratory Testing
- PDF / 4,061,775 Bytes
- 18 Pages / 547.087 x 737.008 pts Page_size
- 17 Downloads / 217 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL PAPER
An Investigation into Support Interaction of Ground Support Through Numerical Modelling and Laboratory Testing Nicholas Vlachopoulos . Carla Carrapatoso . Stephen William Holt . Daniel Cruz . Bradley Forbes
Received: 27 November 2019 / Accepted: 25 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract Tunneling within soil and weaker rock oftentimes utilizes temporary support elements. Over the years, developments have included specialized pre-manufactured support, mechanized installation systems, new techniques and new grout materials. Other advances, to the design process specifically, have been the improvement of computer modelling software that allow for predictions of tunnel behaviour and support behaviour. Despite these advances, there is currently limited knowledge on the mechanisms involved with how, specifically, the surface of the support element interacts with the ground and with the adhesive medium (e.g. grout) which often acts as the internal fixture in the support system. There also exists
N. Vlachopoulos (&) C. Carrapatoso S. W. Holt D. Cruz Department of Civil Engineering, Royal Military College of Canada, Kingston, ON K7K7B4, Canada e-mail: [email protected] C. Carrapatoso e-mail: [email protected] S. W. Holt e-mail: [email protected] D. Cruz e-mail: [email protected] B. Forbes Department of Geological Sciences and Geological Engineering, Queen’s University, 36 Union Street, Kingston, ON K7L 3N6, Canada e-mail: [email protected]
limited database in technical literature of interface parameters for the support system materials (i.e. grout–ground, grout–support element, support element–ground). These interaction parameters are fundamental to better inform design decisions and help to improve the numerical models used to predict excavation mechanical behaviour. In this way, this paper presents an attempt to identify, via numerical modelling, the most sensitive mechanical interaction parameters at the interfaces of ground support system materials as well as quantify their value through pullout and shear laboratory tests. The mechanical behaviour of the support materials interface is also investigated. Keywords Interaction parameters Ground support Distributed optical fiber sensing Pull-out tests Shear tests Finite difference method
1 Introduction The appropriate design of underground support systems is a complex process that has become fundamentally important as the demand for larger subterranean works grows. Available design methods are largely based off empirical criteria that often constitute over conservative designs. As such, it is crucial for design engineers to have an adequate knowledge of the mechanical behaviour of individual
123
Geotech Geol Eng
support members as well as the complex interaction and influence between all elements within the support system. Temporary ground support members are charged with maintaining the load bearing capacity of an excavation before the final
Data Loading...
