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Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel
المؤلفون المشاركون
Hao, Xianjie
Wang, Shaohua
Jin, Duoxiang
Ren, Bo
Zhang, Xiangyang
Qiu, Kailong
Fan, Yingjie
المصدر
العدد
المجلد 2019، العدد 2019 (31 ديسمبر/كانون الأول 2019)، ص ص. 1-17، 17ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2019-05-02
دولة النشر
مصر
عدد الصفحات
17
التخصصات الرئيسية
الملخص EN
The process of crack propagation and tunnel failure is affected by the cross-sectional geometry of an underground tunnel.
In order to quantify the effect of section shape on the process of crack propagation in deep tunnels under high ground stress conditions, a total of four physical models with two cross-sectional shapes and twelve stress levels were designed and several large-scale physical model tests were conducted.
The results indicated that, when the vertical stress is 4.94 MPa, the length and depth of the cracks generated in the rock surrounding the horseshoe tunnel are about eight times that around a circular tunnel.
The position where the circumferential displacement of the horseshoe tunnel begins to be stable is about two, to two and a half, times that around a circular tunnel.
After the deep chamber was excavated, continuous spalling was found to occur at the foot of the horseshoe tunnel and microcracks in the surrounding rock were initially generated from the foot of the side wall and then developed upwards to form a conjugate sliding shape to the foot of the arch roof, where the cracks finally coalesced.
Discontinuous spalling occurred at the midheight of the side wall of the circular tunnel after excavation, and microcracks in the surrounding rock were initially generated from the midheight of the side wall and then extended concentrically to greater depth in the rock mass surrounding the tunnel.
Tensile failure mainly occurred on the surface of the side wall: shear failure mainly appeared in the surrounding rock.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Hao, Xianjie& Wang, Shaohua& Jin, Duoxiang& Ren, Bo& Zhang, Xiangyang& Qiu, Kailong…[et al.]. 2019. Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel. Advances in Civil Engineering،Vol. 2019, no. 2019, pp.1-17.
https://search.emarefa.net/detail/BIM-1115958
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Hao, Xianjie…[et al.]. Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel. Advances in Civil Engineering No. 2019 (2019), pp.1-17.
https://search.emarefa.net/detail/BIM-1115958
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Hao, Xianjie& Wang, Shaohua& Jin, Duoxiang& Ren, Bo& Zhang, Xiangyang& Qiu, Kailong…[et al.]. Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel. Advances in Civil Engineering. 2019. Vol. 2019, no. 2019, pp.1-17.
https://search.emarefa.net/detail/BIM-1115958
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1115958
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
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