地铁煤矿采空区综合勘察方法应用

Risk Regionalization of Camellia Oleifera in Jiangxi Province

煤矿采空区给城市地下工程建设带来重大安全隐患。为查明采空区的空间分布形态及其对地下工程建设的影响,以广州地铁12号线采空区段工程地质勘察为例,提出了地质调绘+物探+钻探+水文地质试验的勘察方案。实践证明,通过地质调绘,可以初步了解采空区分布范围,然后选择合适的物探方法进行探测,最后通过钻探及孔内物探详细圈定采空区空间分布形态及特征,并通过水文地质试验了解采空区的富水性,结果显示,采空区渗透系数为69.40~78.09 m/d,单位用水量为1.845~2.250 L/(s·m)。实践证明,该方案所展示的勘察成果能够指导施工,为地铁工程建设及后续运营提供了可靠依据。

Mined-out area of coal mine brings great hidden danger to urban underground engineering construction.In order to find out the spatial distribution form of the goaf and its influence on underground engineering construction,this paper takes the engineering geological investigation of the goaf section of Guangzhou Metro Line 12 as an example,and puts forward the investigation scheme of geological mapping+geophysical exploration+drilling+hydrogeological test.Practice has proved that through geological mapping,the distribution range of goaf can be preliminarily understood,and then appropriate geophysical exploration methods can be selected for detection.Finally,the spatial distribution form and characteristics of goaf can be delineated in detail through drilling and in-hole geophysical exploration,and the water richness of goaf can be understood through hydrogeological tests.The results show that the permeability coefficient of goaf is 69.40-78.09 m/d,and the unit water consumption is 1.845-2.250 L/(s·m).Practice has proved that the survey results displayed in this scheme can guide the construction and provide a reliable basis for the subway construction and subsequent operation.