废弃采空区地基稳定性极简评价指标体系构建

废弃采空区不良地基残余变形威胁其上方拟建工程的运营安全,对其开发利用前需进行地基稳定性评价,而当前地基稳定性评价指标体系中因素纷繁复杂且数量庞大,极易导致评价结果失去科学性和合理性。以河南古汉山矿和吴村矿废弃采空区上方的武云高速建设为例,基于研究区域的实际地质采矿环境,首先遵从唯一性、目的性、可行性和可观测性四大原则对初选指标进行定性筛选;其次,基于改进灰色关联度算法对定性筛选出的结果再次进行定量筛选,确定了煤层埋深、建(构)筑物荷载扰动深度与导水裂隙带垂向间距以及停采时间作为评价指标,进而构建了适用于武云高速建设地基稳定性评判的极简评价指标体系,通过引入效度系数和相关性系数分析了该指标体系的有效性和可靠性。研究表明:运用所构建的极简指标体系评价武云高速建设地基处于基本稳定状态,评价结果与其他指标体系的评价结果较一致,且由于所构建的指标体系仅含有3个主要指标,可极大减轻系统的计算负担,简化评估过程。

Construction of Minimalist Foundation Stability Evaluation Index System for Abandoned Goaf

The residual deformation of foundation in an abandoned goaf threatens the safety operation of the proposed project， and the foundation stability evaluation is required before its development and utilization. However， the current foundation stability evaluation index system is complicated，which can easily lead to unscientific and unreasonable evaluation results. In view of this， this paper takes the Wuyun expressway construction as an example，which is located above the abandoned goaf of Guhanshan Mine and Wucun Mine in Henan Province.First of all，according to the four principles of uniqueness，purpose，feasibility and observability， qualitative screening is conducted.Secondly，screened quantitatively is conducted based on the theory of improved grey relational degree，and then a minimalist stability evaluation system suitable for Wuyun expressway construction foundation is established.The effectiveness and reliability of established minimalist stability evaluation system is analyzed by using the validity coefficient and correlation coefficient.Wuyun expressway construction foundation is convicted in a basically stable state by using the proposed minimalist stability evaluation system，and the evaluation result is consistent with those of other evaluation index systems，confirming its accuracy. Because the minimalist stability evaluation system only contains three main indicators，it can greatly reduce the calculation burden of the system and simplify the evaluation process.