【摘要】 地裂缝是太原盆地主要的地质灾害之一,自20世纪80年代以来,到2012年8月共发现地裂缝107条带,地裂缝所过之处建筑设施遭到严重破坏。本文以太原盆地裂缝为研究对象,发现地裂缝主要沿太谷-祁县-平遥和清徐-交城-文水呈带状群发,地裂缝发育区位于盆地地下水降落漏斗的边缘和第四系地层沉积厚度变化较大的区域。太原盆地深部莫霍面隆起,导致基底断块掀斜,地震勘探显示两大地裂缝群发带沿交城凹陷边缘断裂分布。我们认为太原盆地地裂缝呈带状群发的特征可能与莫霍面隆起导致的基底断折掀斜相关,或许还受盆地持续的区域拉张应力作用影响,但现今的超常活动应当是人类超采地下水诱发的。更多还原

【Abstract】 Ground fissure is one kind of main geohazards in Taiyuan Basin.107 ground fissures have been found in Taiyuan Basin between the 1980 s and August,2012.Buildings along the ground fissures have been seriously damaged.As the research object,the banded ground fissures in Taiyuan Basin were found mainly distributed along Taigu-Qixian-Pingyao and Qingxu-Jiaocheng-Wenshui zones in the study area.These zones was located at the edge of depression cone of groundwater and the area where the sediment thickness of Quaternary strata thickness varied greatly.The uplift of the deep Moho caused the tilting of the basement fault block.The two groups of ground fissures distributed along the marginal fault of the Jiaocheng Sag showed by the seismic reflection surveys data.It was determined that the distribution characteristics of the ground fissures in Taiyuan Basin was related to the the tilting of the basement fault block caused by the uplift of the deep Moho.Moreover,it was also affected by the continuous regional tensile stress of the Taiyuan Basin.The current extraordinary activities of the ground fissures were to be caused by human ’s over-exploitation of groundwater in this area.更多还原