Prediction Principle of Reserved Deformation and Deformation Control  Technology for Xiaoshan Tunnel Constructed by Bench Method in Soft Rock

doi:10.3973/j.issn.2096-4498.2018.S1.023

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (S1): 148-155.DOI: 10.3973/j.issn.2096-4498.2018.S1.023

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Prediction Principle of Reserved Deformation and Deformation Control  Technology for Xiaoshan Tunnel Constructed by Bench Method in Soft Rock

DU Pengyi¹, GUO Yongzhong¹, ZHANG Qi¹, LIU Yu², HUANG Mingli²

(1. China Railway 16th Bureau Group Co., Ltd., Beijing 101300, China; 2. Beijing Jiaotong University, Beijing 100044, China)

Received:2018-01-02 Revised:2018-03-01 Online:2018-06-15 Published:2018-06-19

Abstract

Abstract:

In order to rationally and dynamically design the reserved deformation for tunnel excavation in soft and weak rock and avoid overbreakinduced lining concrete increase and clearance interfering of primary support, the influence of each construction procedure of bench method on tunnel deformation is analyzed by numerical simulation and site monitoring, and the control standard for deformation of each construction procedure is determined based on deformation distribution principle. And then the corresponding early warning systems and engineering countermeasures are established according to stepped deformation control standards; the final deformation of primary support can be predicted by site monitoring data of each construction procedure. The application results of the abovementioned methods to Xiaoshan Tunnel constructed by bench method show that the primary support deformation is within reserved deformation, the reserved deformation of followed construction circle is dynamically designed, and the concrete amount for primary support has been reduced by 12.86%. The results can provide reference for reserved deformation designed of tunnel constructed by stepped method.

Key words: soft and weak rock tunnel, bench method, reserved deformation, deformation distribution, deformation control technology

CLC Number:

U 45

DU Pengyi, GUO Yongzhong, ZHANG Qi, LIU Yu, HUANG Mingli. Prediction Principle of Reserved Deformation and Deformation Control  Technology for Xiaoshan Tunnel Constructed by Bench Method in Soft Rock[J]. Tunnel Construction, 2018, 38(S1): 148-155.

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Prediction Principle of Reserved Deformation and Deformation Control  Technology for Xiaoshan Tunnel Constructed by Bench Method in Soft Rock

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