【作者】 李昕；

【导师】 董建军； 郑卫锋；

【作者基本信息】 辽宁工程技术大学 ， 工程硕士（专业学位）， 2023， 硕士

【摘要】 随着煤矿资源城市经济发展对土地的需求,在采空区地表进行工程建设成为必然趋势。由此导致的用电需求必须配套建设变电站,但目前尚无下伏采空区变电站安全建设和运营的先例,因此对其场地进行可靠高效地稳定性评估监测是当前亟待解决的问题。InSAR作为近年来发展起来的地表形变监测新技术,能够克服常规形变监测方法监测不连续、周期长、效率低、覆盖范围小等问题,实现对研究区域进行全天候、实时、高效、大范围的监测。针对河南省平顶山市某下伏采空区变电站拟建场地的安全稳定性问题,应用InSAR技术进行安全稳定性监测研究。通过理论研究和数据运算进行地表形变分析,由D-InSAR研究地表沉降空间分布特征,采用SBAS-InSAR和PS-InSAR研究地表时序形变规律,依据监测结果和行业标准对采空区上方变电站拟建场地的安全稳定性进行综合评价。主要完成了以下研究工作:(1)通过D-InSAR运算,获得采空区地表变电站拟建场地沉降空间分布特征,经量化分析得到该场地范围内的累计最大沉降量以及最大沉降增量,分别为-19.3mm和6.3mm,拟建场地地表沉降趋于平缓。(2)基于SBAS-InSAR和PS-InSAR运算,得到采空区地表变电站拟建场地时序形变规律,经计算分析得到该场地范围内监测点的时序形变信息和时序形变速率信息,时序最大沉降值分别为-12.42mm和-13.05mm,时序最大沉降速率分别为-4.98mm/a和-5.02mm/a,近3年沉降速率完全处于-2mm/a以内,沉降速率呈波动降低至稳定状态。(3)根据沉降值和沉降速率对下伏采空区变电站拟建场地进行安全稳定性评价研究,D-InSAR、SBAS-InSAR、PS-InSAR三种方法监测下伏采空区变电站拟建场地的最大沉降量分别为-19.30、-12.42和-13.05mm,均小于150mm,最大沉降速度分别为-0.012、-0.014和-0.014mm/d,均小于-1mm/d,最大倾斜分别为0.057、0.091和0.070,均小于0.2mm/m,依据变电站设备地基基础变形控制标准和采空区地表沉降对建(构)筑物影响程度可知,变电站拟建场地处于安全状态;依据采空区地表移动变形标准判别,场地处于稳定状态。为了确保变电站在运行使用期间的安全稳定性,可以采用一定的建(构)筑物基础抗沉降安全技术措施作为安全储备。该论文有图48幅,表21个,参考文献89篇。更多还原

【Abstract】 With the demand for land in the urban economic development of coal mine resources,engineering construction on the surface of the goaf has become an inevitable trend.The resulting electricity demand must be accompanied by the construction of substations.However,there is no precedent for the safe construction and operation of substations in the underlying goaf.Therefore,it is an urgent problem to evaluate and monitor the stability of the site reliably and efficiently.As a new technology for surface deformation monitoring developed in recent years,InSAR can overcome the problems of discontinuous monitoring,long period,low efficiency,and small coverage of conventional deformation monitoring methods.And it can realize all-weather,realtime,efficient,and large-scale monitoring of the study area.Aiming at the safety and stability of the proposed substation site in an underlying goaf in Pingdingshan City,Henan Province,the safety and stability monitoring research was carried out by applying InSAR technology.Through theoretical research and data operation analysis,DInSAR was used to study the spatial distribution characteristics of surface subsidence,SBASInSAR and PS-InSAR were used to study the temporal subsidence law of the land surface.In addition,based on monitoring results and industry standards,the security and stability of the proposed substation site in the goaf are evaluated comprehensively.The following research work has been mainly completed:(1)Through the D-InSAR operation,the settlement spatial distribution characteristics of the substation site in the goaf were obtained.The quantitative analysis results show that the cumulative subsidence and the maximum subsidence increment within the proposed substation site above the goaf were-19.3mm and 6.3mm respectively,and the surface settlement of the proposed site tends to be flat.(2)Based on the SBAS-InSAR and PS-InSAR operations,the time series subsidence law of the surface substation site in the goaf could be obtained.By calculation and analysis,the temporal deformation and temporal deformation rate information of monitoring points within the proposed substation site in the goaf could be obtained.The maximum subsidence values of the time series were-12.42 mm and-13.05 mm respectively,and the maximum subsidence rates of the time series were-4.98mm/a and-5.02mm/a respectively.In the past three years,the subsidence rate was completely within-2.60mm/a,and the subsidence rate was decreasing year by year.(3)According to the subsidence value and subsidence rate,the safety and stability evaluation of the substation site in the underlying goaf shall be carried out.The three methods of D-InSAR,SBAS-InSAR and PS-InSAR to monitor the maximum subsidence of the proposed substation site were-19.30,-12.42 and-13.05 mm,all of which were less than 150 mm.The maximum subsidence velocities of the three methods were-0.012,-0.014 and-0.014 mm/d,respectively,which were all less than-1mm/d.And the maximum inclinations are 0.057,0.091 and 0.070,which were all less than 0.2mm/m,respectively.According to the substation equipment foundation deformation control standard and the ground movement deformation discrimination standard,it could be seen that the proposed substation site was in a stable state.To ensure the safety and stability of the substation during operation and use,the certain anti-subsidence safety technical measures for the foundation of buildings(structures)could be adopted as safety reserves.The paper has 48 pictures,21 tables,and 89 references.更多还原