According to the differences of structural deformation characteristics, the southern margin of the Junggar basin can be divided into two segments from east to west. Arcnate thrust-and-fold belts that protrude to the n...According to the differences of structural deformation characteristics, the southern margin of the Junggar basin can be divided into two segments from east to west. Arcnate thrust-and-fold belts that protrude to the north are developed in the eastern segment. There are three rows of en echelon thrust-and-fold belts in the western segment. Thrust and fold structures of basement-involved styles are developed in the first row, and decollement fold structures are formed from the second row to the third row. In order to study the factors controlling the deformation of structures, sand-box experiments have been devised to simulate the evolution of plane and profile deformation. The planar simulation results indicate that the orthogonal compression coming from Bogeda Mountain and the oblique compression with an angle of 75° between the stress and the boundary originating from North Tianshan were responsible for the deformation differences between the eastern part and the western part. The Miquan-Uriimqi fault in the basement is the pre-existing condition for generating fragments from east to west. The profile simulation results show that the main factors controlling the deformation in the eastern part are related to the decollement of Jurassic coal beds alone, while those controlling the deformation in the western segment are related to both the Jurassic coal beds and the Eogene clay beds. The total amount of shortening from the Yaomoshan anticline to the Gumudi anticline in the eastern part is -19.57 km as estimated from the simulation results, and the shortening rate is about 36.46%; that from the Qingshuihe anticline to the Anjihai anticline in the western part is -22.01 km as estimated by the simulation results, with a shortening rate of about 32.48%. These estimated values obtained from the model results are very close to the values calculated by means of the balanced cross section.展开更多
莱芜区马家峪村在村庄后方山体建设展销大棚,由于施工不当在展销大棚地表场外堆载平台形成滑坡。为研究滑坡体的变形特征、成因及稳定性,在对滑坡现场进行详细勘查后,对滑坡的诱发因素进行详细评价分析,采用定量、定性的方法对稳定性进...莱芜区马家峪村在村庄后方山体建设展销大棚,由于施工不当在展销大棚地表场外堆载平台形成滑坡。为研究滑坡体的变形特征、成因及稳定性,在对滑坡现场进行详细勘查后,对滑坡的诱发因素进行详细评价分析,采用定量、定性的方法对稳定性进行研究。结果表明,本次滑坡的总体积约5.0×104 m 3,为小型推移式滑坡。在自然状况下,滑坡处于基本稳定状态;在暴雨状况下,稳定性系数为1.001~1.006,说明潜在滑坡处于欠稳定状态,可能发生滑动变形。展开更多
基金financially supported by the National Natural Science Foundation of China(No.40972091)
文摘According to the differences of structural deformation characteristics, the southern margin of the Junggar basin can be divided into two segments from east to west. Arcnate thrust-and-fold belts that protrude to the north are developed in the eastern segment. There are three rows of en echelon thrust-and-fold belts in the western segment. Thrust and fold structures of basement-involved styles are developed in the first row, and decollement fold structures are formed from the second row to the third row. In order to study the factors controlling the deformation of structures, sand-box experiments have been devised to simulate the evolution of plane and profile deformation. The planar simulation results indicate that the orthogonal compression coming from Bogeda Mountain and the oblique compression with an angle of 75° between the stress and the boundary originating from North Tianshan were responsible for the deformation differences between the eastern part and the western part. The Miquan-Uriimqi fault in the basement is the pre-existing condition for generating fragments from east to west. The profile simulation results show that the main factors controlling the deformation in the eastern part are related to the decollement of Jurassic coal beds alone, while those controlling the deformation in the western segment are related to both the Jurassic coal beds and the Eogene clay beds. The total amount of shortening from the Yaomoshan anticline to the Gumudi anticline in the eastern part is -19.57 km as estimated from the simulation results, and the shortening rate is about 36.46%; that from the Qingshuihe anticline to the Anjihai anticline in the western part is -22.01 km as estimated by the simulation results, with a shortening rate of about 32.48%. These estimated values obtained from the model results are very close to the values calculated by means of the balanced cross section.
文摘莱芜区马家峪村在村庄后方山体建设展销大棚,由于施工不当在展销大棚地表场外堆载平台形成滑坡。为研究滑坡体的变形特征、成因及稳定性,在对滑坡现场进行详细勘查后,对滑坡的诱发因素进行详细评价分析,采用定量、定性的方法对稳定性进行研究。结果表明,本次滑坡的总体积约5.0×104 m 3,为小型推移式滑坡。在自然状况下,滑坡处于基本稳定状态;在暴雨状况下,稳定性系数为1.001~1.006,说明潜在滑坡处于欠稳定状态,可能发生滑动变形。
