赣龙铁路梅花山隧道围岩应力及岩体模量研究

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Abstract The distribution characteristics of stress and modulus，the features of stress concentration zone of surrounding rock，and the effect of the method of excavation on the loose zone of surrounding rock were analyzed based on the measurements in Meihuashan tunnel of Ganzhou–Longyan railway. The region of Meihuashan tunnel was found to be located in a high geostress zone with the initial principal stresses to be the tectonic ones. The stress concentration zone in surrounding rock shifted downwards. The stress concentration zone was 5.9–11.9 m for the horizontal hole，and 7.9–15.9 m for the vertical hole. The degree of stress concentration was greatly reduced after the stress concentration zone in surrounding rock was transferred further deeper. The concentration factor of the maximum principal stress was 1.87 for the horizontal hole，and 1.23 for the vertical hole. The relaxed range of the tunnel wall was 0–5 m with the smooth blasting，and the relaxed range was 0.0–7.2 m for the tunnel floor without the smooth blasting. The stress and the modulus of rock mass around the horizontal hole were larger than those for vertical hole at the same depth of the stress relaxation zone. The transfer of the peak stress changed the stress distribution of surrounding rock，which lent a clue for a new type of tunnel support. Key words：

Key words： rock mechanics hydraulic fracturing in-situ stress measurement stress of surrounding rocks modulus of rock mass

Received: 28 April 2014

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I9/1880

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