Estimation of regional stress state and Young’s modulus by back analysis of mining-induced deformation
Estimation of regional stress state and Young’s modulus by back analysis of mining-induced deformation
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DOI：
10.1016/j.ijrmms.2013.05.007
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发表时间：
2013-10
影响因子：
7.2
通讯作者：
J. Kodama;T. Miyamoto;S. Kawasaki;Y. Fujii;K. Kaneko;P. Hagan
中科院分区：
文献类型：
--
作者：
J. Kodama;T. Miyamoto;S. Kawasaki;Y. Fujii;K. Kaneko;P. Hagan
提出了一种通过分析采动地表变形来评价区域应力状态和弹性模量的方法。由于构造板块运动的区域应变状态的变化的影响，可以使用所提出的方法。采矿引起的变形可以表现为采矿活动造成的地表几何形状的变化。有三个潜在的因素，可以有助于变形，这些是：位移引起的重力效应;位移引起的水平区域应变的影响;和，在水平区域应变的增量变化。区域应变和杨氏模量可以同时估计，因为由区域应变引起的位移与杨氏模量无关，而由重力引起的位移与杨氏模量成反比。利用GPS测量了日本鸟形山石灰岩矿开采引起的相对位移。采用三维有限元方法，通过相对位移反分析，估算了区域应力状态和杨氏模量。结果表明，反分析的基础上的测量点之间的距离的变化提供了一个更可靠的估计比可以实现的基础上的直接相对位移。
A method to evaluate regional stress state and Young’s modulus by analyzing the mining-induced deformation of ground is proposed. The effect of changes in regional strain state due to tectonic plate motion can be accounted for using the proposed method. Mining-induced deformation can manifest itself as changes in ground surface geometry resulting from mining activity. There are three underlying factors that can contribute to the deformation, these being: displacement induced by the effect of gravity; displacement induced by the effect of horizontal regional strain; and, incremental change in the horizontal regional strain. Both regional strain and Young’s modulus can be simultaneously estimated, because the displacement induced by the regional strain is independent of the Young’s modulus and the displacement induced by the gravity is inversely proportional to the Young’s modulus. The relative displacement arising from the mining excavation at the Torigatayama limestone mine in Japan has been measured by GPS. Both the regional stress state and Young’s modulus were estimated by back analysis of the relative displacement using a 3-D finite element method. It was shown that back analysis based on changes in distance between the measurement points provides a more reliable estimation than that could be achieved based on the direct relative displacement.