- 권한신청
- P-ISSN2233-8292
- E-ISSN2287-4747
- KCI
ISSN : 2233-8292
3권 3호
초록
Abstract
The behavior of the masonry lining is studied to gain basic inf ormation on how to reinforce the masonry tunnels. Apartfrom the previous works on the masonry structures, the multi-co urse masonry structure, realistic in field condition, isconsidered and the constitutive relationship of the masonry is, orthotropic material properties are proposed according to the s tiffness ratio and the crack initiation and subsequentpropagation model is also considered to model the brittle natur panel is investigated to verify the proposed model and future w orks of the masonry lining are briefly explained.
초록
Abstract
For the pertinent use of NMT method, both characteristics of jo ints (JRC, JCS and ф r) and characteristics of rock mass(Q-Value) must be investigated carefully. The main objective of the study presented is to investigate how sensitive thepredicted behaviour of an underground excavation is to various realistic assumptions about some input parameter for thejointed rock mass. Joint pattern in the tunnel is predicted by statistical approach (chi-square test). In this paper,sensitivity studies involving in joint characteristics were car ried out. The parametric studies involving change in Barton-Bandis joint model have shown that JCS is relatively insensitiv e to JRC and ф r. An increase in JRC value may not,according to the Barton-Bandis model, necessarily lead to a dec rease in displacement. The importance of dilation inpredicting the behaviour of a rock mass around an excavation is emphasized from a comparison of the Barton-Bandisjoint behaviour model with the Mohr-Coulomb model. The Barton-B andis model predicted higher stress, which allow forthe build-up of stress caused by dilatant behaviour.
초록
Abstract
In this study, we carried out investigation and analysis on dam ages in tunnels on order to provide the basicinformation for the safety assessment of tunnels and to minimiz e the potential damage of the same kind as investigated.The frequencies of occurrence in terms of 4 items, i.e., servic e life interval, type of the damage, cause of the damage, andgeological condition, were examined and summarized based on 44 foreign and domestic cases of tunnel damages. Also,we carried out a survey research of which the content included 28 questions on the tunnel safety assessment. Theanswers collected from domestic experts in tunneling suggested that the most probable cause of the tunnel damages wascracking in tunnels at 42~58%. They also suggested that the poo r constrution work strongly caused the damages.Therefore, to ensure tunnel safety, high quality of constrution should be maintained as examined. The types of damageand their extent of influence on the overall tunnel safety are of practical importance to be used in the artficial intelligentsystem for tunnel safety assessment.
초록
Abstract
It is very important to survey in construction for acquiring in formations about geological structure which influencethe tunnel construction. Usually, TSP(Tunnel Seismic Prediction) one of the seismic survey method in tunnels inKorea has been used for prediction of geological condition ahe ad of tunnel face, but in this study HSP(HorizontalSeismic Profiling) was used. As a result of field applicatio n, we predicted that there exist rock discontinuity such asfault, joints and bedding planes. In addition, RMR value from r ock mass evaluation coincided with that from seismicsurvey for rock condition. We compared with rock classifications and evaluation results fo r proving.