某地区地裂缝灾变特征探讨

Discussion on Disaster Characteristics of Ground Fractures in a Certain Area

地裂缝灾害问题会给生产生活带来巨大损失,包括地面塌陷、墙体路面开裂等破坏。采用时序InSAR测量技术,获取2015—2018年某区形变场数据,发现该地区发育了地面沉降。开展物探实验、氡气测量及探槽等工作,结果发现,该地区地裂缝灾变特征呈拉张型破坏和剪切型破坏两种类型,拉张型地裂缝在断层带上盘、下盘均有分布,剪切型地裂缝在断层带靠近上盘一侧分布,综合重力测量、氡气浓度测量及形变场数据,在研究区内识别出一条形变梯度带,初步认为其为断层在第四系的主破裂面,地表陡坎处推测为正断型断层在第四系次级破裂面。

Ground crack disaster will bring great loss to production and life,including ground collapse,wall and pavement cracking,etc.The study obtains the deformation field data of a region from 2015 to 2018 with time-series InSAR measurement technique.It is found that the land subsidence developed in the region.Then the study conducts geophysical experiments,radon gas measurement and exploration trough work,etc.It is found that the disaster characteristics of ground fractures in this area are tensile and shear fracture.The tensile fracture is distributed in the fault zone and the footwall,and the shear fracture is distributed in the fault zone near the upper wall.Based on gravity measurement,radon concentration measurement and deformation field data,a deformation gradient zone is identified in the study area,which is initially considered to be the main fracture plane of the quaternary system.The surface steeper is presumed to be the secondary fracture plane of the quaternary system.