三峡重庆地区钻孔应变资料可靠性检验与分析

Reliability Test and Analysis of Borehole Strain Data in Chongqing Area of the Three Gorges

对三峡重庆地区6个四分量钻孔应变资料进行可靠性分析,利用其增量观测数据进行相对标定,得到各站点测区的应变参数,并分析测区相对应变特征。结果表明,6个站点的钻孔应变观测资料是可靠的,其中1个站点测区面应变呈现张性变化,靠近三峡库首区的5个站点测区面应变呈现压性变化,测点主压应变方向与大范围构造应力场方向较为一致,表明三峡重庆地区呈现压性特征。

The reliability analysis of 4-component borehole strain data of the six sites in the Chongqing area of the Three Gorges is carried out. The strain parameters of each site is derived using relative cal- ibration, and the local deformation characteristics in this area are obtained. The results show that the borehole strain observation data of the six sites are reliable, and the plane strain of one site is tension- al, but the strain of the other five sites near the Three Gorges area is pressured. The direction of the principal strain is consistent with the direction of the regional stress, indicating the pressure charac- teristics of Chongqing area of the Three Gorges.