ABSTRACT

Underground coal gasification (UCG) is a green mining technology with less interference to the environment of mining area. However, underground coal gasification also can cause surface subsidence, which will affect the mining area environment. Therefore, it is necessary to study the evaluation method of surface subsidence degree of underground coal gasification to provide scientific basis for environment influence assessment of underground coal gasification. However, few current researches are conducted on the evaluation of surface subsidence degree of underground coal gasification (UCG). To solve this problem, this paper firstly proposes the process for assessing surface subsidence degree of UCG, and then offers a new method of surface subsidence prediction of UCG based on continuum-stochastic medium theory by combining the characteristics of strata movement of UCG without shaft. Meanwhile, the new approach was applied to evaluate the subsidence degree of UCG experiment site of Ulanqab mine. It was found that the subsidence area of UCG test site was in Class I damage, and have slight impact on the environment of the mining area. The safety of ground buildings can also be guaranteed. The research results own important theoretical significance for the environment impact assessment caused by underground coal gasification and UCG industrialization.

摘要

煤炭地下气化（UCG）是一种对矿区环境干扰较小的绿色采矿技术。但煤炭地下气化也会引起地表沉降，影响矿区环境。因此，有必要研究煤炭地下气化地表沉降度评价方法，为煤炭地下气化环境影响评价提供科学依据。然而，目前关于煤炭地下气化（UCG）地表沉降度评价的研究较少。针对这一问题，本文首先提出了UCG地表沉降度评估流程，然后结合无竖井地层运动的特点，提出了一种基于连续-随机介质理论的地表沉降预测新方法。同时，采用新方法评价乌兰察布矿UCG试验场的沉降程度。经发现，UCG试验场沉陷区为Ⅰ类破坏，对矿区环境影响较小。地面建筑物的安全也可以得到保障。研究成果对煤炭地下气化环境影响评价及UCG产业化具有重要的理论意义。经发现，UCG试验场沉陷区为Ⅰ类破坏，对矿区环境影响较小。地面建筑物的安全也可以得到保障。研究成果对煤炭地下气化环境影响评价及UCG产业化具有重要的理论意义。经发现，UCG试验场沉陷区为Ⅰ类破坏，对矿区环境影响较小。地面建筑物的安全也可以得到保障。研究成果对煤炭地下气化环境影响评价及UCG产业化具有重要的理论意义。