TSP在高地温—高地应力隧道地质预报中的问题及改进

doi:10.11720/wtyht.2022.1167

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Abstract

The Sichuan-Tibet Railway under construction has a large number of tunnels under high geotemperature and high in-situ geostress.How to improve the accuracy of advanced geological prediction of these tunnels is a major difficulty in railway construction.Taking the Tunnel Seismic Prediction (TSP) method for advanced geological prediction as an example,analyses reveal that there are two major problems in the detection of the tunnels.On is that the use of emulsion explosives and plastic detonating tubes in blastholes under a high rock-temperature is liable to cause misfires,thus affecting data acquisition.The other is that the wave velocity differences between the excavated and unexcavated areas of tunnels under high in-situ geostress are not considered in data processing.Targeting these problems,this paper proposes six improvement measures,namely researching and developing detonation packs with a thermal insulation bag,establishing intelligent engineering assessment systems based on multiple geological information,changing the models of shock initiation of the TSP,popularizing new technologies and methods of advanced geological prediction,researching and developing advanced geological prediction systems suitable for Tunnel Boring Machines (TBMs),and improving the organizational management of geological prediction.All these measures can provide references for efficient detection of advanced geological prediction of tunnels in areas with high geotemperature and high in-situ geostress.

Key words： geological prediction tunnel high geotemperature high in-situ stress seismic wave

Received: 24 March 2021 Published: 25 February 2022

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	Zhan-Feng FAN
	Jian-Hua CAI
	Wei ZHAO

Cite this article:

Zhan-Feng FAN,Jian-Hua CAI,Wei ZHAO. Problems and improvements of Tunnel Seismic Prediction in geological prediction of tunnels under high geotemperature and high in-situ geostress[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 268-274.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1167 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/268

Schematic diagram of TSP detection principle

Distribution characteristics of high geo-temperature in some tunnels of Sichuan-Tibet Railway

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Distribution of in-situ geostress measurement boreholes in Ya’an-Xinduqiao section of Sichuan-Tibet railway^[21]

Crack propagation experiment of jointed rock mass under different in situ stress

Test of initiating charge pack material for thermal insulation bag

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