MA Zhengjing, ZHANG Zhongjian, ZHAN Tao, YANG Ye, XU Jiamo, LI Lihui, LI E. 2019: FORMATION OF SURFACE CRACK OF HORNITO AT WUDALIANCHI VOLCANO, HEILONGJIANG PROVINCE, CHINA. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 294-301. DOI: 10.13544/j.cnki.jeg.2017-628
    Citation: MA Zhengjing, ZHANG Zhongjian, ZHAN Tao, YANG Ye, XU Jiamo, LI Lihui, LI E. 2019: FORMATION OF SURFACE CRACK OF HORNITO AT WUDALIANCHI VOLCANO, HEILONGJIANG PROVINCE, CHINA. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 294-301. DOI: 10.13544/j.cnki.jeg.2017-628

    FORMATION OF SURFACE CRACK OF HORNITO AT WUDALIANCHI VOLCANO, HEILONGJIANG PROVINCE, CHINA

    • Hornito, formed by cooled lava, is a key protection of lava landform in active Wudalianchi volcano geopark. At present, a lot of cracks are developed on the surfaces of hornitos and are responsible to hornito damage. Based on forming process of hornitos, the paper analyzes temperature changes of lava during cooling. A 3D model of a hornito is established and the thermal stress distribution is calculated through numerical simulation. On this basis, this paper uses fracture mechanics to analyse crack morphology and distribution of the hornito. The study shows that thermal stress is generated in hornito during lava cooling. The maximum principal stress trace presents circumferential distribution. Moreover, the cracks are vertical and parallel. Adjacent cracks have approximate equidistance. Besides, the width of some cracks on the outer side is larger. Crack tips are sharp or blunt. The density of crack distribution is different. The vertical cracks observed at the scene conform to these characteristics. According to this, this paper points out that vertical cracks are the primary cracks produced during the forming process of hornito.
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