ANALYSIS ON CHARACTERISTICS OF TECTONIC STRESS FIELD AND THE GEODYNAMIC ENVIRONMENT IN THE YANGTZE RIVER ECONOMIC BELT
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摘要: 综合已有的研究成果，根据长江经济带活动构造块体和构造应力场的分布特征进行了构造应力场分区，总体上划分为华北应力分区、华南应力分区以及青藏高原应力分区，其中华南应力分区是长江经济带的主体应力分区。在此基础上，根据长江经济带的活动断裂及构造块体划分建立了有限元网格模型，利用二维有限元对长江经济带的构造应力场进行模拟，并分析了长江经济带的动力学环境。研究表明，长江经济带构造应力场受印度板块、太平洋板块和菲律宾板块联合作用控制，印度板块与欧亚板块的碰撞作用决定了长江经济带总体构造应力场的主要趋势，局部区域受到周边构造环境的影响；东南部处于菲律宾板块向欧亚板块俯冲所诱发的拉张环境，表现为冲绳海槽，西南部受印度板块北移所诱发的缅甸板块的剪切拉张作用，表现为实皆断裂及其西侧的缅甸中央盆地；青藏高原东缘物质横向挤出过程中受到太平洋板块和菲律宾板块的联合俯冲作用，对长江经济带地应力场的分布特征产生重要影响。Abstract: According to existing research results, the tectonic stress field in the Yangtze River Economic Belt is divided into different zones based on active blocks and characteristic of tectonic stress field, respectively as the North China stress zone, the Southern China stress zone and the Qinghai-Tibet plateau stress zone. The South China stress zone is the major part of the Yangtze River economic belt. Based on that, we established a two-dimensional finite element model according to the active faults and tectonic blocks in the Yangtze River Economic Belt to simulate the tectonic stress and to analyze the geodynamic environment of the Yangtze River Economic Belt. The result shows that the tectonic stress field of the Yangtze River Economic Belt is combined controlled by the India plate, Pacific plate and Philippines sea plate. Collision between India plate and the Eurasian plate determines the overall trend of the stress field, and local areas also are affected by the surrounding tectonic environment. Southeast China is effected by the stretching environment of Okinawa Trough produced by Philippines plate subducting to Eurasian plate, Southwest China is effected by the northward moving of the India plate inducing shear and tension of Burma plate and resulting of Sagaing fault and western of Burma central basin, material of eastern Qinghai-Tibet Plateau in the transverse extrusion process is controlled by the joint subduction of the Pacific plate and Philippines plate, and has important influence for the distribution characteristics of the crustal stress field in the Yangtze River Economic Belt.
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图 3 长江经济带构造应力场最大主压应力模拟结果
Ⅰ-华北应力区；Ⅱ-华南应力区；Ⅲ-长江经济带西部应力区
Figure 3. Simulated result of maximum principal stress in Yangtze River Economic Belt
表 2 边界施加载荷
Table 2. Loading on boundary
边界 载荷/N x方向 y方向 AB段 0 0 BC段中北段 -300000 -80000 BC段南段 300000 100000 CD段东段 300000 100000 CD段西段 -500000 200000 DE段 -500000 200000 EF段东段 -300000 500000 EF段西段 -300000 800000 FG段 -1500000 2500000 GH段 5000000 -3000000 HI段 7000000 -3000000 IA段 10000000 10000000 
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表 3 模型岩石物性参数
Table 3. Physical property parameters of rocks in model
块体 杨氏模量/MPa 泊松比 西部块体(a) 70000 0.3 东部块体(b) 50000 0.3 活动断裂发育带(c) 7000 0.3
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