煤炭地下气化过程中产生的高温改变了燃空区围岩的热学参数，从而影响燃空区围岩温度场的传播。目前缺乏针对高温-热学参数耦合效应下的煤炭地下气化围岩温度场扩展规律的研究，造成气化过程中温度场扩展的反演计算相对失真，限制了多场耦合条件下地下气化采场围岩控制技术的发展，亟待开展相关研究。利用Fish语言对FLAC3D自带的热传导模型进行改进，建立了高温-热学参数耦合效应下温度场研究的数值模拟方法，并将其应用于煤炭地下气化围岩温度场扩展的研究中，取得以下成果:高温极大改变了煤炭热学参数的分布，同时热学参数的分布的变化也改变了温度场的扩展规律，高温与热学参数具有双向耦合特征；煤炭地下气化围岩温度场扩展经历了3个阶段，煤层燃烧过程中的高温扩展阶段，对流散热过程中的冷却扩展阶段，气化完成后不与外界产生热交换的稳定扩展阶段，热学参数的耦合作用改变了煤炭地下围岩温度场的分布，高温扩展阶段结束后温度场在顶板传播范围为3.2 m，两侧煤壁6.5 m，底板1.3 m。冷却扩展阶段温度场在顶板传播范围为12.2 m，两侧煤壁7 m，底板5.5 m；气化完成后温度场在燃空区围岩内部持续传播，继续影响燃空区围岩的长期稳定性。

The high temperature produced in the process of underground coal gasification changes the thermal parameters of the surrounding rock in the goaf,thus affecting the propagation of the temperature field of the surrounding rock in the goaf. At present,there is a lack of research on the temperature field expansion law of surrounding rock in underground coal gasification under the coupling effect of high temperature-thermal parameters,which causes the inversion calculation of temperature field expansion in gasification process to be relatively distorted,and limits the development of surrounding rock control technology in underground coal gasification stope under the condition of multi-field coupling. In this paper,Fish language is used to improve the heat conduction model of 

FLAC3D,the numerical simulation method of temperature field research under the coupling effect of high temperature and thermal parameters is established,and it is applied to the study of temperature field expansion of surrounding rock in underground coal gasification,and the following results are obtained. High temperature has greatly changed the distribution of thermal parameters of coal,at the same time,the distribution of thermal parameters has also changed the expansion law of temperature field. High temperature and thermal parameters have bidirectional coupling characteristics. The expansion of surrounding rock temperature field in underground coal gasification has experienced three stages,namely,the high temperature expansion stage in the process of coal seam combustion,the cooling expansion stage in the process of convection heat dissipation,and the stable expansion stage without heat exchange with the outside world after gasification. The coupling effect of thermal parameters changed the distribution of temperature field in underground surrounding rock of coal. After the high temperature expansion stage,the temperature field spread in the roof was 3.2 m,the coal walls on both sides were 6.5 m,and the floor was 1.3 m. During the cooling expansion stage,the temperature field spread in the roof is 12.2 m,the coal walls on both sides are 7 m,and the floor is 5.5 m. After gasification,the temperature field continuously propagates in the surrounding rock of the goaf,which continues to affect the long-term stability of the surrounding rock of the goaf.