城市地下空间网络化拓建扰动评价方法及应用

为了评价城市地下空间网络化拓建施工扰动效应，基于地下空间拓建工程案例调研，提出5种网络化拓建模式和18种结构类型以及拓建体系构成的“四要素”. 在拓建扰动传导路径及构成要素内在工作机制分析的基础上，确定拓建结构、既有结构、地层和周边环境4个子目标构成的拓建扰动度总评价目标及应力、位移6个评价指标. 采用层次分析法(AHP)构造判断矩阵，通过专家打分法确定评价指标权重，根据评价指标控制值分级法确定评价指标的隶属度，构建按5级划分的城市地下空间网络化拓建扰动分级评价标准. 通过评价方法应用，得到不同拓建模式的拓建扰动度排序为以小扩大＞竖向增层＞近接增建＞连通接驳，不同地层的拓建扰动度排序为软土地层＞黄土地层＞冲洪积地层＞岩石地层；近距增建时，拓建扰动度随着近接距离的增大而显著减小.

Evaluation method and application of urban underground space networked expansion disturbance

Five expansion pattern types and eighteen structure types were proposed, as well as the "four elements" of the expansion system based on the investigated cases of underground space expansion projects in order to evaluate the disturbance effect of urban underground space network extension construction. The total evaluation objective composed of four sub-objectives, including extensional structure, existing structure, stratum and surrounding environment, and six stress and displacement evaluation indexes were determined based on the analysis of the expansion disturbance conduction path and the internal working mechanism of its elements. The analytic hierarchy process (AHP) was used to construct the judgment matrix. The evaluation index weight was determined by expert scoring. Then the control value grading method was applied to determine the membership degree of the evaluation index, thereby constructing a five-level urban underground space network expansion disturbance classification evaluation standard. The application of the above evaluation method was conducted. The order of expansion disturbance degree of different expansion methods is expansion by small>vertical expansion>horizontal expansion >connected connection, and the order of expansion disturbance degree of different stratum is soft soil >loess >alluvial-diluvial strata>rock. The expansion disturbance degree will decrease significantly with the increase of the proximity distance for horizontal expansion.