Particle simulation of spontaneous crack generation associated with the laccolithic type of magma intrusion processes
Particle simulation of spontaneous crack generation associated with the laccolithic type of magma intrusion processes
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DOI：
10.1002/nme.2287
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发表时间：
2008-09
影响因子：
2.9
通讯作者：
Chong-bin Zhao;B. Hobbs;A. Ord;S. Peng
中科院分区：
文献类型：
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作者：
Chong-bin Zhao;B. Hobbs;A. Ord;S. Peng
本文的主要目的是扩展粒子模拟方法，用于模拟与地壳内的乳石型岩浆侵入和侵位相关的自发裂纹生成问题。由于侵入岩浆的力学行为与其围岩不同，因此采用压缩性相对较小的流体颗粒来模拟侵入岩浆，而采用常规固体颗粒来模拟侵入岩浆的围岩。使用所提出的粒子模拟方法，可以模拟一些岩浆侵入引起的重要现象，例如与岩浆室形成相关的水力压裂、与岩浆室生长相关的复杂移动边界以及当岩浆压力从岩浆室传播到周围岩石时周围岩石中自发裂纹的萌生。相关粒子模拟结果表明：（1）所提出的粒子模拟方法对于模拟与地壳内的乳石型岩浆侵入过程相关的自发裂纹生成问题是有用的和适用的； (2)产生的裂纹高度集中在侵入岩浆室正上方的狭窄区域； (3)层刚度比对地球上地壳内自发产生的裂缝模式有显着影响。版权所有 © 2008 约翰·威利父子有限公司
The main purpose of this paper is to extend the particle simulation method for simulating the spontaneous crack generation problem associated with the laccolithic type of magma intrusion and emplacement within the crust of the Earth. As the mechanical behavior of the intruded magma is different from that of its surrounding rocks, the intruded magma is simulated using fluid particles of relatively less compressibility, whereas the surrounding rock of the intruded magma is simulated using conventional solid particles. Using the proposed particle simulation method, it is possible to simulate some magma‐intrusion‐induced important phenomena, such as hydraulic fracturing associated with the creation of a magma chamber, complicated moving boundaries associated with the growing magma chamber and spontaneous crack initiation in the surrounding rocks when magma pressure is propagating from the magma chamber into the surrounding rocks. The related particle simulation results have demonstrated that (1) the proposed particle simulation method is useful and applicable for simulating spontaneous crack generation problems associated with the laccolithic type of magma intrusion process within the crust of the Earth; (2) the generated cracks are highly concentrated on the narrow region that is just above the intruded magma chamber; and (3) the layer‐stiffness ratio has a significant effect on the spontaneously generated crack patterns within the upper crust of the Earth. Copyright © 2008 John Wiley & Sons, Ltd.