... results of the modules are exported automatically which is convenient for users. 1. INTRODUCTION tunnel parameter module key block stereographic projection graph software architecture Block Theory rock engineering analysis type data module easykbt graph joint pyramid plane...

... discontinuous rock mass zhang engineering excavation classification key block excavation step tunnel procedure block classification removable block tunnel excavation ARMA 15-162 TBM Tunneling in Discontinuous Rock Masses Zhang, Z.X. Department of Geotechnical Engineering, College of Civil...

... to the failure of the investigated block. (iii) The northern part of the investigated block (key block) had moved out first from the top of the mountain in a direction parallel to the strike of the north boundary discontinuity plane (T2) and had undergone shear failure on the T2 surface as well as on a weak...

... ABSTRACT: Traditional rock support design methods of rock slopes and tunnels are reviewed. Towards a more rational support design, not only the effects of blocks inside the rock mass on the key blocks day-lighting into the excavation directly are considered, but also whether or not these day...

... blocks and potential key blocks. This study is an example of the application of the block theory and kinematic analysis for a granite rock mass at a cut slope located at Fraser's Hill in Pahang, Malaysia. The purpose of this study is to indentify key blocks, potential key blocks, stable blocks...

... chamber actual design Case History discontinuity dowel Block Theory key block method coupling block theory maximum removable block Rock mechanics Symposium removability analysis support force stabilization design tunnel friction angle ARMA 08-339 Tunnel stability analysis using a method...

... ABSTRACT: Evaluating the presence and stability of key blocks located in the foundation of existing concrete dams presents a unique challenge for the geo-engineering professional assigned to analyze the stability of the structure because the geologic structures on interest are usually...

... ABSTRACT : Predictions of key blocks in underground excavations are uncertain, subject to the natural variation of rock properties. This study illustrates how stochastic fracture concept could be applied to make such predictions more realistic. The methodology was tested on the rock cavern...

... ABSTRACT: The Masada mountain is located on the western margins of the seismically active Dead Sea riit system. Therefore, dynamic key block stability is of primary concern in the densely fractured East and North rock slopes of the mountain. Recent seismogenic key block motions in the East...

... siltstone/shale and sandstone, block theory was used to identify removable blocks around the tunnel opening and to analyze the stability of these blocks. The stabilization system was designed to resist movement of any key blocks. Furthermore, block theory was used to generate configurations of joint traces...

... 1 INTRODUCTION. ABSTRACT: A deterministic key block analysis for drives in the vicinity of the No 8 lode, South Crofty mine was performed. Limitations of deterministic and current probabilistic key block analysis were noted. A different form of probabilistic analysis has been developed...

... ABSTRACT Introduction This paper presents a practical and intuitive method of finding all unsafe areas on tunnel surfaces. The unsafe arezs consist of the faces of 3-d key blocks. Each such face is delimited by joint traces. The cylindrical surface of the tunnel and the joint traces on it can...

... ABSTRACT ABSTRACT: A probabilistic approach for key block analysis was introduced and compared with the current deterministic analysis in key block theory. A case study was made to demonstrate the capability of the probabilistic key block analysis, where three subway tunnels were studied...

... INTRODUCTION Instability of excavations in rocks often initiates at the surface through movement of unstable removable blocks, or key blocks. Consequently, it is desirable to eliminate or minimize the presence of key blocks when designing rock excavations. Block Theory analysis (Goodman and Shi, 1985...

... ABSTRACT ABSTRACT Chan and Goodman (1983) presented a procedure for simulating joint traces and identifying key blocks on an excavation. This paper defines six measures of support requirements that characterize the number and dimensions of key blocks, taking into account the frictional...

... key blocks, after the keystones of a masonry arch (Figure 1). Support of the keystone of an arch is fundamental; loss of the keystone means deterioration of stability and collapse if that deterioration is not speedily countered. The same is true in the case of the hypothetical underground cavern shown...