【摘要】 基于淮南5个煤矿区的水压致裂法地应力测量结果,揭示淮南煤矿区的地应力特征及其随岩性的变化规律,分析开挖后围岩应力特征及塑性区变化规律,初步得出如下结论:(1)淮南5个煤矿区地应力以构造应力场为主,属高应力区;(2)岩性对岩体地应力侧压系数影响大,砂岩区岩体地应力侧压系数为1.52～1.87,泥岩区岩体地应力侧压系数为1.08～1.18;(3)岩性是影响围岩塑性区特征的重要因素。由于岩性的差异,最大主应力相近的潘一煤矿和顾桥煤矿南区围岩塑性区范围有较大差异。与此同时,刘庄煤矿实测部位最大水平主应力小于潘一煤矿,但由于矿区测试部位的岩性为灰泥岩,围岩塑性区范围明显大于岩性为石英砂岩的潘一煤矿。研究结果可为类似巷道围岩的变形破坏机制分析以及巷道加固支护提供参考。更多还原

【Abstract】 Based on in-situ stress measurement results in 5 mine areas of Huainan coal mine,Anhui province,by hydraulic fracturing method,the in-situ stress characteristics and the influence of lithology on it are revealed;the variation law of stress and plastic zone of surrounding rocks around tunnels after excavation are analyzed.The following preliminary results are obtained as follows:(1) The tectonic stress is dominant in these areas and the stress level is high.(2) The lithology has a great influence on the coefficient of lateral pressure.The obtained coefficients of sandstone are 1.52–1.87,and for mudstone,they are 1.08–1.18.(3) The lithology has a great influence on the plastic zone of surrounding rocks around tunnels.Because of the difference of lithology,the range of plastic zone in Panyi mine differs greatly from that of south part of Guqiao coal mine,though the maximum horizontal principal stresses of these two mines are close.In addition,the range of plastic zone in Liuzhuang coal mine which consists of calcilutyte is obviously greater than that of Panyi coal mine which consists of quartz-sandstone,though the maximum horizontal principal stresses at the measured depth in Liuzhuang coal mine is smaller than that of Panyi coal mine.The results can provide references for analysis of failure mechanism of surrounding rocks and reinforcement and support of tunnels of similar projects.更多还原