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西部地区主要为白垩系软岩地层,煤炭资源储量大,成为我国重要产煤区.白垩系软岩地层冻结壁温度场分布规律尚不清楚,给白垩系地层冻结法凿井设计与施工带了一定的困难.通过现场实测、室内试验和数值模拟等手段,获得了白垩系地层冻结软岩热物理参数分布规律、力学特性及深井冻结壁冻融规律.测点冻结温度场反演白垩系冻结软岩导热系数值一般介于3.328~3.465 W·m-1·K-1之间,现场实测表明:白垩系地层融冻时间比一般为1.0~1.2之间.研究白垩系地层冻融规律,对指导我国西部地区白垩系地层冻结法凿井设计与施工具有重要的理论参考价值.
The western region is mainly Cretaceous soft rock formation with large reserves of coal resources and has become an important coal-producing region in China.The distribution of temperature field in the frozen wall of the Cretaceous soft rock formation is not yet clear, which gives the design and construction of the freezing method of crevasse formation in the Cretaceous Some difficulties have been obtained.Through the field test, laboratory test and numerical simulation, the distribution laws and mechanical properties of the frozen soft rock in the Cretaceous strata have been obtained, and the freezing and thawing law of the frozen wall in the deep well has been obtained. The thermal conductivity of soft rock generally ranges from 3.328 to 3.465 W · m-1 · K-1. The field measurements show that the thawing time of the Cretaceous strata is generally between 1.0 and 1.2. The freeze-thaw regularity of Cretaceous strata is studied, It has an important theoretical reference value for guiding the design and construction of the freezing method sinkhole in the Cretaceous strata in western China.