成都中心城区砂卵石层三维建模及分布规律研究

为解决成都市在高富水砂卵石层中施工引起的地面迟滞沉降等城市工程地质问题,研究成都市砂卵石分布规律,笔者依托已有的成都地铁1、2、3、4、7号线等大量的勘察及区域地质资料,借助Surfer及GOCAD软件,首次建立了成都市中心城区砂卵石层的三维地质模型。三维模型的准确度及精度经过了探井等实测资料的验证,成都中心城区砂卵石层整体厚度由西北向东南逐渐减薄,稍密卵石土层变化平缓,中密卵石土层由北向南沿河流走向变薄特征明显,密实卵石土层底界与基岩接触面深度自西向东逐渐变浅,中心城区卵石土的总体积超过1.757 6×10⁸ m³。构建的三维地质模型,可为成都市中心城区今后的工程建设提供重要参考。

3D Modeling and Exploring the Spatial Distribution of the Sand-pebble Layer in the Central Chengdu,Sichuan Province

In order to solve various problems of urban engineering geology such as ground hysteresis settlement caused by high water-rich pebble soil layer in the city of Chengdu,and to study the distribution law and overall volume of sand and pebble in Chengdu,a three-dimensional geological model of sand and pebble strata in the central city of Chengdu was established for the first time with the help of Surfer and GOCAD software based on a large number of survey and regional geological data of Chengdu Metro Lines 1,2,3,4 and 7. The accuracy and precision of the 3D model have been verified by the actual data such as exploration wells. The conclusion shows the overall thickness of the sand pebble soil layer shows gradually thinned from northwest to southeast,the slightly compactness pebble soil layer changes gently,and the middle compactness pebble soil layer gradually thins from north to south along the river. The depth of the boundary between the bottom boundary of the dense pebble soil and the bedrock gradually becomes shallower from west to east,and the total volume of the pebble soil in the central city exceeds 1.757 6×10⁸ m³. The constructed 3D geological model can provide an important reference for the future construction of the downtown area of Chengdu.