CAJ | 학술논문

为了分析煤岩水力压裂裂缝扩展规律，采用真三维水力压裂物理模拟实验平台进行煤样真三轴水力压裂物理模拟实验，模拟不同地层应力、渐进角条件下煤样水力压裂过程。实验表明：天然裂隙和割理是影响煤岩裂缝扩展的重要因素，导致裂缝扩展规律复杂多样化；当水平应力差系数值kh>1时，水力压裂裂缝趋于沿最大水平主应力方向扩展，当kh值<1时，水力压裂裂缝趋于沿天然裂隙方向扩展，当kh值=1时，水力压裂裂缝扩展方向处于不定状态；渐近角对水力压裂裂缝扩展的影响程度总体上小于天然裂隙、割理和水平应力差，实验结果与煤矿井下压裂裂缝观测结果一致。
위료분석매암수력압렬렬봉확전규률，채용진삼유수력압렬물리모의실험평태진행매양진삼축수력압렬물리모의실험，모의불동지층응력、점진각조건하매양수력압렬과정。실험표명：천연렬극화할리시영향매암렬봉확전적중요인소，도치렬봉확전규률복잡다양화；당수평응력차계수치kh>1시，수력압렬렬봉추우연최대수평주응력방향확전，당kh치<1시，수력압렬렬봉추우연천연렬극방향확전，당kh치=1시，수력압렬렬봉확전방향처우불정상태；점근각대수력압렬렬봉확전적영향정도총체상소우천연렬극、할리화수평응력차，실험결과여매광정하압렬렬봉관측결과일치。
To analyze coal and rock hydraulic fracturing fissure outspread pattern, using true 3D volumetric display hydraulic fracturing physical simulation experiment platform carried out coal sample true 3D volumetric display tri-axial hydraulic fracturing physical simu?lation experiment, to simulate coal sample hydraulic fracturing process under different strata stresses and angles of approach. The ex?periment has shown that the natural fissures and cleats are major factors to impact coal and rock fissure outspread, and cause fissure outspread pattern diversified. When the horizontal stress difference coefficient kh>1, fissure outspread tend to along the maximum hori?zontal principal stress orientation, when kh<1, tend to along natural fissure orientation, when kh=1, in a state of uncertainty. The impact from angle of approach on fissure outspread orientation is less than natural fissure, cleat and horizontal stress difference as a whole. The results of experiment are coincided with coalmine underground hydraulic fracturing fissures observation.