The analysis of radial displacements occurring near the face of a circular opening in weak rock mass

Başarır, Hakan; Geniş, Melih; Özarslan, Ahmet

doi:10.1016/j.ijrmms.2010.03.010

Cited by 35 publications

(18 citation statements)

References 22 publications

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“…The use of the LDP is also advantageous to the calculation of the GRC for jet grouted tunnels. Contrary to the longitudinal pressure variation, which has been derived essentially for elastic ground behavior [36], the LDP is provided by analytical, numerical, and empirical relations for a variety of ground behaviors including grounds with time-dependent behavior [21,22,[37][38][39][40][41]. One can also take into account the effect of tunnel supports by using implicit relations such as Eq.…”

Section: Conventional Vs New Approach For Grc Calculationmentioning

confidence: 99%

Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening

Heidari

Tonon

2015

International Journal of Rock Mechanics and Mining Sciences

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Section: Conventional Vs New Approach For Grc Calculationmentioning

confidence: 99%

Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening

Heidari

Tonon

2015

International Journal of Rock Mechanics and Mining Sciences

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“…Bu araştırmacılardan Panet [4], Ünlü ve Gerçek [5], Başarır ve arkadaşları [6] elastik çözümlemelere dayalı, Chern ve arkadaşları [7] de arazi ölçümlerine dayalı ve Hoek ve arkadaşları, [8] Aydan ve Geniş [9] elasto-plastik çözümlemelere dayalı eşitlikler önermiştir. Bu çalışmalardan, kazı yapıldığında tünel arınında oluşan yer değiştirmenin, açıklıkta oluşacak toplam yer değiştirmenin yaklaşık %20-30"u civarında olduğu bulunmuştur.…”

Section: Arazi Reaksiyon Eğrisinin Oluģturulmasıunclassified

Kuyu Duraylılığının Analitik ve Sayısal Yöntemler ile Karşılaştırmalı Bir İncelemesi

Geniş

Acun

2015

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetBu çalışmada, kuyu duraylılığın değerlendirilmesi için analitik ve sayısal gerilme çözümlemesi yöntemlerinden faydalanılmıştır. Analitik çözümlerde konverjans sınırlama yöntemi, sayısal çözümlemelerde ise sonlu elemanlar yöntemi kullanılmıştır. Tahkimatlı kuyunun sayısal çözümlemesinde kullanılan yük dağılımı oranları söz konusu yöntemlerden elde edilen sonuçların karşılaştırılmasıyla bulunmuştur. Tahkimatlı açıklıkların modellenmesinde kullanılan yük dağılımı oranları sırasıyla birinci aşamada %70-75, ikinci aşamada %25-30 arasında olduğu belirlenmiştir. İncelenen durumlar için kuyunun beton kaplamasının duraylı olduğu sonucuna ulaşılmıştır. Son olarak, tahkimatlı açıklıkların modellenmesinde göz önünde bulundurulan bazı önemli hususlar sunulmaktadır.Anahtar Kelimeler: Kuyu, Duraylılık, Yenilme, Arazi reaksiyon eğrisi, Tahkimat karakteristik eğrisi A Comparative Study of Shaft Stability by Analytical and Numerical Methods AbstractIn this study, analytical and numerical stress analyses (methods) were utilized to evaluate the shaft stability. Convergence confinement method and finite element method were used during the analytical and numerical analyses, respectively. Load split ratios used in the numerical solution for the supported shaft were also obtained by comparison of results of the above mentioned methods. It was determined that load split ratios employed for supported openings were 70-75% in the first stage and 25-30% in the second stage, respectively. It was concluded that concrete support of shaft is stable for considered conditions. Finally, some important considerations on the modelling of supported openings are presented.

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“…e excavation of the underground cavern is almost equivalent to the removal of internal constraints, which will cause the stress change of the medium around the excavation area, resulting in more complex stress release [11][12][13][14]. At present, the theoretical analysis for stress release rate of roadway excavation is not yet mature.…”

Section: Introductionmentioning

confidence: 99%

2D Semimodel of Full‐Section Anchorage in Thick Soft Rock Roadway

Lyu

Zhao

et al. 2018

Shock and Vibration

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This paper focuses on the reinforcement effect of full-face anchorage in thick soft rock roadway. A 2D semimodel of full-face anchorage in roadway with thick surrounding soft rock was proposed firstly by transforming the confinement effect of the excavation face in the longitudinal direction as the virtual internal support force at the circumferential surface. Then, based on the theory of elasticity, the theoretical model of the coupling effect between surrounding rock and anchoring system was established, and the analytical solutions of stress and displacement were obtained employing superposition principle. Finally, the theoretical solution was verified by numerical simulation, and the distribution laws of stress release-anchor stock-surrounding rock coupling were analyzed in detail considering stress release. Results demonstrated that the stress field of the surrounding rock diverse widely with different stress release coefficients. With the increasing of stress release coefficient, the radial stress of the surrounding rock decreases, while the tangential stress increases. The supporting role of the bolt is mainly reflected in improving the radial stress of the anchorage zone. However, it has little effect on the tangential stress. What is more, the anchoring effect is more significant to soft rock stress than hard rock. In addition, the prestress of rock bolt has a certain matching relation with the bolt parameters, the surrounding rock parameters, and the initial stress. This study laid a theoretical foundation for further analysis of the interaction between surrounding rock and bolt supporting in plastic zone.

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The analysis of radial displacements occurring near the face of a circular opening in weak rock mass

Cited by 35 publications

References 22 publications

Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening

Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening

Kuyu Duraylılığının Analitik ve Sayısal Yöntemler ile Karşılaştırmalı Bir İncelemesi

2D Semimodel of Full‐Section Anchorage in Thick Soft Rock Roadway

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