基于FLAC^(3D)数值模拟的老采空区剩余沉降量分析计算——以山东枣庄安博化工项目为例

Calculation and Analysis on Residual Subsidence Amount in Old-Goaf Based on FLAC^(3D) Numerical Simulation

采空区的剩余沉降值计算是采空区地质灾害危险程度一种定量分析的方法,利用FLAC3D直接模拟早期采煤形成的老采空区塌陷状态,计算出老采空区的剩余沉降量。以山东枣庄安博化工项目为例,首先采用物探、钻探手段探测老采空区深度、顶板塌落与破碎状况以及地质地层信息,其次结合岩心试验地质材料参数结果进行FLAC3D模拟,计算自重作用下采空区剩余沉降量,以及加载建筑后老采空区剩余沉降值,对比了传统概率积分法计算沉降值,结果基本一致,说明计算方法是可靠的。最后分析加载应力与破碎带剩余沉降值的数量关系。为老采空区土地稳定性评估以及剩余沉降量的计算方法提供科学依据与借鉴。

Calculation of residual subsidence amount in mined out area is a method for analyzing danger-ous degrees in goaf quantitatively.The state of early coal forming goaf has been directly simulated by using FLAC3D ,and the residual settlement of the old mined out area has been calculated.Taking chemical engi-neering proj ect in Zaozhuang city of Shandong province as an example.Firstly,by using geophysical pros-pecting and drilling methods,depth,roof falling and broken condition of old goaf have been gained.Sec-ondly,combining with parameters results of geological materials obtained from core test,FLAC3D simula-tion has been carried out,residual sbusidence amount under the action of gravity and residual subsidence a-mount after loading construction of old goaf have been calculated.Compared with traditional probability in-tegral method,subsidence results are similar.It is showed that the calculation method is reliable.Finally the relationship between load stress and residual subsidence have been analyzed.It will provide scientific basis and references for stability evaluation and calculation of residual subsidence amount in old goaf.