Discussion on Identification of Hidden Ground Fissures in Type Ⅲ Typical Loess Terrace Sites
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摘要: 西安地裂缝因过量开采地下水、产生不均匀沉降而发育。其中，三类场地属于隐伏地裂缝发育区域。通过地质调查、工程地质钻探等手段，对典型黄土地层三类场地隐伏地裂缝进行调查及识别，确定了地裂缝的位置和走向。结果表明该段地裂缝与西安地区已探明的F3地裂缝高度拟合，建议工程建设中合理选择避让距离。研究可为西安地区典型黄土三类场地地裂缝勘察提供借鉴。Abstract: Xi'an ground fissures are developed due to excessive exploitation of groundwater and uneven settlement. Among them, the type Ⅲ site belong to the development area of hidden ground fissures. The existence of hidden ground fissures in type Ⅲ site in typical loess stratum was investigated and identified by means of geological survey, engineering geological drilling and other means, and the location and trend of ground fissures were determined. The results show that the ground fissure in this section matches the F3 ground fissure that has been proved in Xi'an area. It is suggested that the avoidance distance should be reasonably selected to prevent economic losses. Through the investigation of the ground fissures and the study of the engineering geological characteristics, it can provide a reference for the investigation and exploration of the ground fissures in type Ⅲ typical loess sites in Xi'an area in the future.
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Key words:
- ground fissures /
- loess strata /
- geological disaster /
- ground fissure development /
- geological drilling
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表 1 地质勘探异常位置点
剖面线 异常位置 孔距/m 地下水位
情况地面位置 勘探误差
△k/m2-2' DA3、DA5 9.63 未见 DA3 10.0 3-3' DB3、DB5 9.53 未见 DB3 10.0 01-0'1' DF4、FB5 8.61 未见 DF4 10.0 4-4' DC5、DC4 8.49 未见 DC5 10.0 5-5' DD5、DD4 8.88 未见 DD5 10.0 6-6' DE5、DE4 7.61 未见 DE5 10.0 
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表 2 场地地裂缝勘察成果
推测地裂缝
地面点编号坐 标/m 勘探精度
修正值△k/mX Y DA3 13774.877 25114.805 10.0 DB3 13808.489 25157.536 10.0 DF4 13838.702 25201.080 10.0 DC5 13861.287 25243.470 10.0 DD5 13882.566 25286.497 10.0 DE5 13902.189 25327.786 10.0
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