ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2018, Vol. 38 ›› Issue (S2): 161-168.DOI: 10.3973/j.issn.2096-4498.2018.S2.022
Previous Articles Next Articles
YANG Xueqi1, 2, YANG Nie1, 2, YAO Meng1, 2
Received:
Revised:
Online:
Published:
Abstract:
In order to study the applicability of a large crosssection tunneling method, microbench method Ⅰ, for rapid excavation construction in Grade Ⅳ surrounding rock to, the stability of surrounding rock during the construction of microstep I method is analyzed based on numerical analysis of strength reduction method and displacement mutation and calculation nonconvergence as main indices; and the safety of the actual tunnel structure is determined by analyzing the field monitoring data. The analytical results show that: (1) The vertical displacement of the crown top and spandrel is sensitive to the strength reduction factor, while the horizontal convergence of arch feet and sidewall is sensitive to the strength reduction factor. (2) The strength reduction safety factor obtained by using the traditional threebench method and the that by microbench method Ⅰ with large machinery is almost the same; and the microbench Ⅰ method has little influence on the stability of the surrounding rock, which can ensure the safe and rapid tunneling and has good feasibility in Grade Ⅳ surrounding rock.
Key words: ZhengzhouWanzhou Highspeed Railway, large crosssection tunnel, microbench method I, strength reduction method, field monitoring
CLC Number:
U 45
YANG Xueqi, YANG Nie, YAO Meng. Study of Applicability of Large Crosssection Tunneling Method Based on Strength Reduction Method and Onsite Monitoring Measurement[J]. Tunnel Construction, 2018, 38(S2): 161-168.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2018.S2.022
http://www.suidaojs.com/EN/Y2018/V38/IS2/161