Significance evaluation on available properties of soil mass in underground space in Xiongan New Area based on rough set theory
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摘要: 地下空间的开发利用是新时代实现城市经济与社会、资源、环境可持续协调发展的必经之路。为了客观评价雄安新区土体可利用属性的重要性，基于粗糙集理论，探讨了雄安新区地下空间50 m 以浅不同深度范围（0~5 m、5~30 m 和30~50 m）内常见的工程类型以及土体可利用性的影响因素，并对土体可利用性的影响因素进行了重要性评价，得出了影响土体可利用属性的重要度和权重值。结果表明：（1）雄安新区地基土的工程地质性质总体良好，适宜大规模建设，但仍需关注人工填土层（杂填土、素填土）、软弱土层（淤泥质粉质粘土、软塑粉质粘土）、液化土层（粉土、粉细砂）、地下水位、坑塘等不良的工程地质特性；（2）得出了土体可利用属性的重要性排序：0~5 m依次为地基承载力、杂填土厚度、粉土层厚度、砂土层厚度、坑塘分布、地下水位，5~30 m依次为淤泥质层厚度、地下水位、粉土层厚度、砂土层厚度、地基土均匀性，30~50 m依次为地下水位、砂土层厚度、粉土层厚度；（3）粗糙集理论能够客观地评价雄安新区地下空间土体可利用性，从知识表达系统中挖掘影响因素之间的内在规律，得到客观可靠精细的重要度和权重值，为雄安新区地下空间土体的开发利用提供了评价依据。Abstract: The development and utilization of underground space is the only way to realize the sustainable and coordinated development of urban economy, society, resources and environment in the new era. In order to objectively evaluate the importance of soil mass in Xiongan New Area, according to the engineering geological characteristics of shallow soil mass 50 meters underground space in Xiongan New Area, the common engineering types and the factors affecting the availability of soil mass in different depths (0~15 m, 15~30 m and 30~50 m)are discussed. Based on the rough set theory, the importance of the factors affecting soil exploitability was evaluated, and the importance and weight of the factors affecting soil exploitability were obtained. The results showed that: (1) The engineering geological properties of foundation soil in Xiongan New Area are generally good and suitable for large-scale construction. However, attention should be paid to artificial filling soil(miscellaneous fill soil and plain fill soil), soft soil (silty clay and soft plastic silty clay), liquefied soil (silty soil and fine sand), groundwater, pit-ponds and other undesirable engineering geological characteristics. (2) The importance order of available soil properties is obtained: 0~15 m is the bearing capacity of foundation, the thickness of mixed fill, the thickness of silt soil layer, the thickness of sand soil layer, the distribution of pit, and the groundwater level, 15~30 m is the thickness of silt layer, the groundwater level, the thickness of silt soil layer, the thickness of sand soil layer, and the uniformity of foundation soil, and 30~50 m is the groundwater level, the thickness of sand soil layer, and the thickness of silt soil layer. (3) Rough set theory can be used for objectively evaluating the availability of soil mass in the underground space in Xiongan New Area, excluding the influence of subjective factors. The internal laws of influencing factors are explored from the knowledge expression system, which provides an evaluation basis for the development and utilization of soil in the underground space in Xiongan New Area.
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Key words:
- rough set theory /
- Xiongan New Area /
- underground space /
- availability /
- significance
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