由于煤矿岩石与CO2突出危害严重，但发生频度较煤与瓦斯突出低，导致多年来对岩石与CO2突出机制研究一直不够系统深入。为解决这一问题，在前人研究成果的基础上，分析了我国发生岩石与CO2突出矿区含煤地层的CO2成因，总结了岩石与CO2突出规律和特征，建立了岩石与CO2突出物理模型，剖析了岩石与CO3突出过程、力学环境和能量条件。结果表明：参与突出的CO2均为无机成因型，与岩浆岩活动和煤田自燃热解有关；岩石与CO2突出是地应力、承压气体、突出岩体力学性质等因素综合作用的结果，由于参与突出的气体富集受气源控制，岩石与CO2突出危险区域呈点状或条带状分布；基于煤与瓦斯突出关键结构体致灾理论建立的岩石与CO2突出关键结构体模型与突出现场环境吻合，突出砂岩命名为结构1，对突出砂岩起支撑包裹作用的岩体分别命名为结构2、结构3和结构4；岩石与CO2突出过程经历了准备、启动、发展、终止4个阶段，突出准备阶段包括形成关键结构体直到突出激发完成，突出启动阶段是一个瞬态过程，突出启动与结构1的能量大小有关，只有当结构1积蓄的能量大于突出所需能量，即能量判据Ce≥1时才能成功启动；利用关键结构模型和能量判据能够揭示典型岩石与CO2突出事故的启动机制，为岩石与CO2突出防治提供了依据。

As the frequency of rock and CO2 outburst is lower than that of coal and gas outburst, although the hazards of rock and CO2 outburst are serious, the research on the mechanism of rock and CO2 outburst has not been systematic and in-depth for many years.In order to solve this problem,based on the previous research results, the CO2 genesis of the rock and coal-measure strata in the mining areas where CO2 outburst occurred in China was analyzed. Then, the characteristics of rock and CO2 outburst were summarized.The physical model of CO2 outburst was established, the process, mechanical environment and energy condition of CO2 outburst were also analyzed in this paper. The results show that the CO2 gas involved in the outburst is of inorganic origin, which is related to magmatic rock activity and coal field spontaneous combustion and pyrolysis, CO2 outburst is the result of combined effect of factors such as in-situ stress, confined gas and mechanical properties of outburst rock mass.The gas enrichment is controlled by the gas source, and the CO2 outburst danger area is distributed in dots or strips. The key structure model based on the disaster theory of coal and gas outburst key structure is consistent with the outburst site environment. The sandstone is named for Structure 1, and the rock mass supporting and wrapping the outburst sandstone is named as Structure 2, Structure 3 and Structure 4 respectively. The CO2 outburst process has gone through four stages:preparation, start-up, development and termination, and the preparation stage includes the formation of key structures until the outburst excitation is completed. The outburst start-up stage is a transient process from structure to outburst excitation. The outburst start-up is related to the energy of structure 1. Only when the accumulated energy of structure 1 is greater than the energy required for outburst, that is, the energy criterion Ce ≥ 1, can be successful started. The key structure model and energy criterion can reveal theinitiationmechanism of typical CO2 outburst accidents and provide a basis for outburst prevention and control