2015年12月25日山東平邑塌陷事件產(chǎn)生的位移場與應(yīng)力場
[Abstract]:On December 25, 2015, gypsum mine collapsed in Pingyi County, Shandong Province. The isotropic collapse point source model is used to calculate the displacement field, horizontal stress field and Coulomb stress change on the nearby Mengshan Foreland fault. The results show that: 1) the horizontal displacement of the collapse center is 18 mm, and the horizontal displacement within the range of 5km is about 1 mm, pointing to the collapse center; The vertical subsidence of the collapse center is up to 4 mm, and within about 3km of the collapse center, the horizontal displacement and vertical displacement decrease rapidly to negligible in the distance, which is due to the shallow source of the collapse. The displacement change is limited to the local surface. 2) due to the influence of the free surface, the collapse causes the surface shrinkage stress in the 5km range of the underground 2km depth, and the surface shrinkage stress reaches 1 000 Pa. In the distance, all of them are in the state of surface expansion stress, and the maximum expansion stress is about 1 000 Pa.The surface expansion stress decreases rapidly to below 100Pa at the point about 10km from the center of the collapse. The maximum claimed stress and principal compressive stress on the plane of 2km depth are up to 10 000 Pa.The principal compressive stress shows a radial distribution centered on the collapse in the range of about 5km in which the principal compressive stress is larger than the dominant stress, and outside the collapse center about 5km. The stress is distributed in radial direction with collapse as the center, and increases with the increase of distance. The main compressive stress and the claim stress rapidly attenuate to the 100Pa order of magnitude. 3) the collapse resulted in a decrease in the Coulomb rupture stress on the Mengshan Foreland fault (the fault segment considered inactive) in the northwestern part of the country, with a maximum value of 2 500 Pa. The Coulomb fracture stress on the Mengshan Foreland fault (considered to be the active fault segment of the Quaternary left-lateral normal fault) in the southeast of China is increased to a maximum of 2 400 Pa. the risk of the fault should be paid attention to.
【作者單位】: 防災(zāi)科技學(xué)院;山東省地震局;
【基金】:國家自然科學(xué)基金(41674055) 河北省地震科技星火計(jì)劃(DZ20170109001)共同資助
【分類號(hào)】:P315.727
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