RELATION BETWEEN THE GROUND STRESS STATE AND GEOLOGICAL HAZARDS IN THE UPPER REACHES OF THE YELLOW RIVER
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摘要: 本文在广泛收集研究区相关资料的基础上, 以实测地应力值为依据, 对研究区的地应力状态进行了模拟分析, 进而对地应力状态与地质灾害的关系进行了探讨。得到如下认识:地震活动是地应力积累到一定程度而释放的结果, 强震活动一般发生在最大主应力方向与断裂走向呈锐角的部位, 地震活动往往发生在局部高应力区。崩塌、滑坡、泥石流灾害在空间分布上与最大差应力的高值区存在较好的对应关系, 但与最大主应力高值区则无明显的对应关系。Abstract: On the basis of the data collected from the study region extensively, this paper simulates the ground stress state of the region and discusses the relation between the stress state and geological hazards according to the measured values of the ground stress. The conclusion is as follows : earthquake activity is the result of release of ground stress when it is accumulated to a certain extent; strong earthquake activity generally occurs at a site where the direction of the maximum principal stress makes an acute angle with the fault strike; earthquake activity usually took place in a local high-stress region. The distribution of collapses, landslides and mud flows has a good corresponding relation with the high-value region of the maximum differential stress but no distinct corresponding relation with the high-value region of the maximum principal stress.
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Key words:
- upper reaches of the Yellow River /
- ground stress /
- geological hazard
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图 1 黄河上游地区地质构造与地址灾害综合分区图
Figure 1. Distribution of geological structure and divisions of geohazordsin the upper reaches of the Yellow River
图 2 黄河上游地区地应力场略图
Figure 2. Sketch map of the stress field in the upper reaches of the Yellow River
图 3 黄河上游及其外围地区地应力模拟模型图
Figure 3. Simulation model of ground stress in the upper reaches of the Yellow River and their surroundings
图 4 黄河上游及其外围地区最大主应力方向模拟结果图
Figure 4. Simulation results of the orientation of the maximum principal stress in the upper reaches of the Yellow River and their surroundings
图 5 黄河上游及其外围地区最大主应力模拟结果图
Figure 5. Simulation results of the maximum principal stress in the upper reaches of the Yellow River and their surroundings
图 6 黄河上游及其外围地区最小主应力模拟结果图
Figure 6. Simulation results of the minimum principal stress in the upper reaches of the Yellow River and their surroundings
图 7 黄河上游及其外围地区最大差应力模拟结果图
Figure 7. Simulation results of the maximum differential stress in the upper reaches of the Yellow River and their surroundings
表 1 模型采用的岩石物理力学参数
Table 1. Physical-mechanical parameters of rocks in the model
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