CAJ | 학술논문

用数值模拟的方法探讨了自10 Ma以来喜马拉雅弧形造山带的西构造结及邻区岩石圈的形变和位移变化特征,并采用不同的流变参数和流变结构模拟了前2 Ma内的形变和应力场的演化过程,通过对不同黏性系数、本构关系和初始地壳厚度的改变在演化过程中所起的作用研究表明:(1)采用黏弹性模型时,西构造结区黏性参数的选取对西构造结及邻区隆升高度和隆升范围有重要影响,计算结果给出西构造结区地壳黏性系数应小于10~(23)Pa·s;(2)相对刚性的塔里木盆地采用弹性结构时,对整个西构造结区域的应力和应变场均能引致明显变化;(3)力学性质稳定块体的存在并没有使应力场的传播出现明显的解耦现象.
용수치모의적방법탐토료자10 Ma이래희마랍아호형조산대적서구조결급린구암석권적형변화위이변화특정,병채용불동적류변삼수화류변결구모의료전2 Ma내적형변화응력장적연화과정,통과대불동점성계수、본구관계화초시지각후도적개변재연화과정중소기적작용연구표명:(1)채용점탄성모형시,서구조결구점성삼수적선취대서구조결급린구륭승고도화륭승범위유중요영향,계산결과급출서구조결구지각점성계수응소우10~(23)Pa·s;(2)상대강성적탑리목분지채용탄성결구시,대정개서구조결구역적응력화응변장균능인치명현변화;(3)역학성질은정괴체적존재병몰유사응력장적전파출현명현적해우현상.
In this paper, the stress and strain fields of lithosphere in Himalayan Western Syntaxis orogenic belt and its adjacent areas since 10Ma are investigated through using the 3-D finiteelement simulation,and deformation and evolution process in former 2Ma are simulated with different rheological parameters and rheological structure. Studies on functions in simulation process of different viscosity parameters, constitutive relation and changes of initial curst thickness show below results:(1)When various viscoelastic models are adopted, the selection of the coefficient of viscosity in the Western Syntaxis area has important influence on the its uplifts and evolutions. The computational results show that the viscosity in the Western Syntaxis area should be smaller than 10~(23)Pa·s; (2) When the elastic model is adopted in relatively rigid Tarim basin, obvious changes are induced to the stress and strain fields of the whole Western Syntaxis area;(3)The existence of mechanical property stable block doesn't make the propagation of the stress field show obvious decoupling phenomenon.