地下空间是城市的重要资源,特别是在中国患有“城市病”的一线城市中尤为重要。笔者选定广州市城区为研究区,首先利用地质环境调查成果和着重分析当地对地下工程开发利用的主要制约因素,从而选取影响地下空间开发利用的评价因素,并采用...地下空间是城市的重要资源,特别是在中国患有“城市病”的一线城市中尤为重要。笔者选定广州市城区为研究区,首先利用地质环境调查成果和着重分析当地对地下工程开发利用的主要制约因素,从而选取影响地下空间开发利用的评价因素,并采用专家层次分析定权法来确定因子的权数,建立广州市地下空间开发利用适宜性分区的评价模型,利用ArcGIS软件获得最终适宜性评价图。结果表明,研究区面积1561 km 2,其中适宜、较适宜区域占比61.64%,较不适宜区域占比37.63%,仅有0.73%的面积不适宜开展地下工程。展开更多
A residential building in Guilin City, China, underwent an up-and-down vibration with an amplitude of 2 cm. By eliminating several causes such as earthquake, wind and construction, in combination with the unique karst...A residential building in Guilin City, China, underwent an up-and-down vibration with an amplitude of 2 cm. By eliminating several causes such as earthquake, wind and construction, in combination with the unique karst geological conditions of Guilin, it was inferred that the effect of turbulent karst water is the main contributor to the occurrence of this vibration. Therefore, a geophysical survey was undertaken on the vibration zone and its surroundings. The resutls suggest that the soil in the upper part of the karst grooves shows conspicuous traces of disturbance and the water content has low resistance. A comprehensive analysis indicates that there is a karst strong runoff zone beneath the area. According to the water level and water temperature data collected automatically by the instrument, it can be concluded that the groundwater level had changed significantly twice during this period, so it was determined that the denudation of groundwater strong runoff causes the overlying soil layer to collapse, forming a soil-water soft-flow material with mixed phase. Since the building in this area was supported by friction piles, the groundwater-soil soft-flow material with mixed phase has intense plasticity, and the up-and-down vibration resulted in the change of the friction piles, which caused the up-and-down vibration of the building structure.展开更多
文摘地下空间是城市的重要资源,特别是在中国患有“城市病”的一线城市中尤为重要。笔者选定广州市城区为研究区,首先利用地质环境调查成果和着重分析当地对地下工程开发利用的主要制约因素,从而选取影响地下空间开发利用的评价因素,并采用专家层次分析定权法来确定因子的权数,建立广州市地下空间开发利用适宜性分区的评价模型,利用ArcGIS软件获得最终适宜性评价图。结果表明,研究区面积1561 km 2,其中适宜、较适宜区域占比61.64%,较不适宜区域占比37.63%,仅有0.73%的面积不适宜开展地下工程。
基金Guangxi Science and Technology AB17195036, ChinaGuangxi Science and Technology AB18126062, ChinaGuilin Innovation-driven Programme: 20170214, China.
文摘A residential building in Guilin City, China, underwent an up-and-down vibration with an amplitude of 2 cm. By eliminating several causes such as earthquake, wind and construction, in combination with the unique karst geological conditions of Guilin, it was inferred that the effect of turbulent karst water is the main contributor to the occurrence of this vibration. Therefore, a geophysical survey was undertaken on the vibration zone and its surroundings. The resutls suggest that the soil in the upper part of the karst grooves shows conspicuous traces of disturbance and the water content has low resistance. A comprehensive analysis indicates that there is a karst strong runoff zone beneath the area. According to the water level and water temperature data collected automatically by the instrument, it can be concluded that the groundwater level had changed significantly twice during this period, so it was determined that the denudation of groundwater strong runoff causes the overlying soil layer to collapse, forming a soil-water soft-flow material with mixed phase. Since the building in this area was supported by friction piles, the groundwater-soil soft-flow material with mixed phase has intense plasticity, and the up-and-down vibration resulted in the change of the friction piles, which caused the up-and-down vibration of the building structure.
