.MohammadReza. 19850 اشتراک گذاری ارسال شده در 7 شهریور، ۱۳۹۰ در این تایپیک قصد داریم مقالات به روز و زبان اصلی مکانیک سنگ و تونل سازی رو براتون قرار بدیم. امیدوارم مفید باشه.. 6 لینک به دیدگاه
.MohammadReza. 19850 مالک اشتراک گذاری ارسال شده در 7 شهریور، ۱۳۹۰ ELASTO-PLASTIC SOLUTION OF TUNNEL PROBLEMS USING THE GENERALIZED FORM OF THE HOEK-BROWN FAILURE CRITERION Abstract: The Hoek-Brown failure criterion is a semi-empirical method widely used in the estimation of shear strength of rock. Among other parameters involved in this criterion, the coefficient a dictates whether the criterion applies to intact rock or rock masses (a = 0.5 for intact rock anda > 0.5 for rock masses). Most of the existing elasto-plastic solutions for tunnel problems in Hoek-Brown media consider an intact rock (i.e., a = 0.5). This is not only due to historical reasons (the failure criterion was originally developed for intact rock), but also due to the mathematical difficulties of deriving neat, closed-form expressions for the general case in which a ≥ 0.5. This paper presents a rigorous, elasto-plastic solution for the axi-symmetrical problem of excavating a circular tunnel in generalized Hoek-Brown material (a ≥ 0.5). The solution is obtained by re-writing the generalized Hoek-Brown failure criterion in terms of transformed stress quantities. Application of the transformation rule described in this paper to elasto-plastic problems of excavations in generalized Hoek-Brown materials is shown to bring significant advantages in the interpretation and extrapolation of results obtained with analytical and numerical methods. C. Carranza-Torres1 برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 6 لینک به دیدگاه
.MohammadReza. 19850 مالک اشتراک گذاری ارسال شده در 7 شهریور، ۱۳۹۰ Penetration rate of TBMs SYNOPSIS: A number of empirical relationships have been in vogue to predict the penetration rate of TBMs. These relations consider compressive strength, tensile strength, hardness test data, RQD, RSR, RMR, Q-values etc., either independently or in combination with some of these parameters. Barton proposed an elaborate expression consisting of 21 parameters. Experimental studies in Italian Alps on the performance of TBM in medium to hard metamorphic rocks revealed considerable deviation from Barton-approach. A simple expression dimensionally correct to predict penetration rate is presented considering the basic TBM data, properties of rock mass and also intact rock, in situ stress and drilling rate index of rock. It has been verified with the data from 16 rock types of Maen and Pieve tunnels in Italian Alps giving very encouraging results. A brief mention is also made how to predict advance rate of TBMs. برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 7 لینک به دیدگاه
.MohammadReza. 19850 مالک اشتراک گذاری ارسال شده در 9 شهریور، ۱۳۹۰ A MAMDANI FUZZY INFERENCE SYSTEM FOR THE GEOLOGICAL STRENGTH INDEX (GSI) AND ITS USE IN SLOPE STABILITY ASSESSMENTS Abstract: The strength and deformation modulus of closely jointed rock masses can be estimated by using the Hoek and Brown empirical criterion in conjunction with the Geological Strength Index (GSI) classification system. To minimize the uncertainties of the rock masses, experienced engineers commonly use the engineering judgment. Intervals of the GSI, rather than point-valued observations, are also likely to be obtained when using the original GSI chart. This study is an attempt to provide an approach on the fuzzy set theory for determining GSI ratings to be used by the empirical failure criterion. For the purpose, the original GSI system and its quantitative modified form were defined by fuzzy sets, and Mamdani fuzzy algorithm was constructed employing 23 “if-then” rules. In addition, the validity of the approach and methodology of parameter estimation were checked by back analysis of the well-documented slope instabilities occurred in the heavily jointed rock masses برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 5 لینک به دیدگاه
.MohammadReza. 19850 مالک اشتراک گذاری ارسال شده در 9 شهریور، ۱۳۹۰ Shallow Cover Tunnel Under Heritage Listed Brick Buildings: Brisbane Boggo Road Busway Tunnel Introduction The use of underground space for new transport infrastructure in urban environments has become very common due to space constraints. In built-up areas these tunnels will often pass under sensitive buildings. This article presents a case study on a shallow cover driven busway tunnel under heritage-listed buildings on shallow footings. Phase2 (in design), Unwedge and Dips computer software packages were used extensively. The latter two packages were used extensively during tunnel excavation. برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 6 لینک به دیدگاه
.MohammadReza. 19850 مالک اشتراک گذاری ارسال شده در 9 شهریور، ۱۳۹۰ Influence of rock mass properties on TBM penetration rate in Karaj-Tehran water conveyance tunnel Predicting penetration rate (PR) of tunnel boring machine (TBM) due to the properties of rock mass surrounding tunnel has been an important subject in the mechanized method of excavating tunnel. Influence of uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), peak slope index (punch penetration), spacing of discontinuities (of weakness planes), orientation of discontinuities with respect to the tunnel axis (Beta angle) on penetration rate of TBM was investigated while excavating Karaj- Tehran water conveyance tunnel by a double shield Herencnesht TBM. Statistic analysis was carried out on the relationship between measured test results of the five different parameters of rock mass properties and the penetration rate of TBM. The results showed that each of the five different parameters of rock mass properties individually has affected the penetration rate of TBM. The relationship between peak slope index (PSI) and penetration rate of TBM has the best correlation coefficient ® of 0.57 in comparison with the four others relationship between rock mass properties and the penetration rate of TBM. The relationship between BTS of rock and PR of TBM has a very poor correlation coefficient ® of 0.11. Multilinear regression analysis was applied to indicate the combined influence of the five different rock mass properties on the penetration rate of TBM using a database of measured test results. A new empirical formula was achieved to predict PR of TBM as a function of different rock mass properties (r = 0.75). برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 6 لینک به دیدگاه
hirt 492 اشتراک گذاری ارسال شده در 29 مرداد، ۱۳۹۱ برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 4 لینک به دیدگاه
hirt 492 اشتراک گذاری ارسال شده در 22 مهر، ۱۳۹۱ نام لاتین کتاب : Introduction to Tunnel Constraction نام فارسی کتاب : مقدمه ای بر ساخت تونل ناشر :Alfred Stärk , David Chapman, Nicole Metje سال انتشار : ۲۰۱۰ لینک دانلود : برای مشاهده این محتوا لطفاً ثبت نام کنید یا وارد شوید. ورود یا ثبت نام 3 لینک به دیدگاه
hp4520 11 اشتراک گذاری ارسال شده در 22 اسفند، ۱۳۹۱ با تشکر فراوان از لطف شما لینک ترجمه مقاله غیر فعاله لطفا رسیدگی کنید 1 لینک به دیدگاه
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