Abstract
The frost heave force (FHF) is one of the most important reason of inducing freezing damages of tunnel in seasonal frozen regions. Analyzing the change law of FHF is helpful to design for avoiding freezing damages in the tunnel lining. Field measurement is an approved method used in mechanical analysis of tunnel lining, however, it is difficult to measure the FHF directly, which is changed coupled with the original surrounding rock pressure (OSRP). In this paper, in order to clarifying the change law of the FHF, a new measuring method was presented. The best advantage of this method is that the FHF could be separated from the OSRP by measuring the surrounding rock temperature and the lining pressure at the same time. A lot of field measurement work about the FHF was conducted based on Jichoushan tunnel and the change law of the FHF was analyzed using the presented method. The results can provide preference for the antifreeze design of tunnel in seasonal cold regions.
Highlights
China consists of about 54% seasonal frozen surface, where a large number of tunnels have been constructed for the increasing requirement of transportation (Feng et al, 2016; Lai et al, 2018; Feng et al, 2019; Fan et al, 2019; Fan et al, 2020)
Based on the NATM design concept (Zhang et al, 2018), the surrounding rock has selfsupporting capacity and will bear part of the frost heave force (FHF), but when frost heave occurs, a large part of the FHF will act on the lining support
The principle is as follows: firstly, the variation law of surrounding rock temperature was recorded, the lining pressure was measured synchronously by means of the testing system; secondly, the original surrounding rock pressure (OSRP) was obtained by the lining pressure of unfrozen period, the OSRP + FHF was obtained by the lining pressure of frozen period, the D-value between the lining pressure before and after the surrounding rock frozen is the FHF
Summary
China consists of about 54% seasonal frozen surface, where a large number of tunnels have been constructed for the increasing requirement of transportation (Feng et al, 2016; Lai et al, 2018; Feng et al, 2019; Fan et al, 2019; Fan et al, 2020). The FHF refers to the force exerted on the support system due to frost heave after the frozen-thaw zone of confined surrounding rock is frozen (Bronfenbrener,2009; Zhang et al, 2004; Lai at al., 2005; Gao at al., 2012; Feng at al., 2017; Li et al, 2017; Zeng et al, 2017; Hu at al., 2018; Liu et al, 2018; Wang et al, 2018; Xia et al, 2018a; Huang et al, 2020; Lyu et al, 2020). In order to reflect the change law of the FHF, a method of measuring FHF was proposed in this paper This method is measuring the surrounding rock temperature and the lining pressure at the same time via the monitoring system, which includes the temperature sensors, soil pressure box and the data acquisition section. We can obtain the frost heave characteristic of the tunnel by analyze the FHF and the generalized FHF from the recorded lining pressure data
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