卸荷损伤作用下含瓦斯煤体冲击倾向性研究对于探明地下深部矿井中煤与瓦斯复合型冲击地压形成机理起着关键作用。为了探究卸荷作用对含瓦斯煤体冲击倾向性的影响，对含瓦斯煤体进行了不同卸荷幅度下变上限循环加卸载。试验结果表明：瓦斯对煤体力学性质具有劣化作用，9 MPa围压下经过1 MPa与2 MPa瓦斯作用后的煤试件抗压强度分别降低了11.2%及18.7%；在卸荷幅度分别为3 MPa与6 MPa作用下，煤试件抗压强度分别降低了12.6%与36.5%，剩余弹性能指数分别降低了10.4%与16.7%；含1 MPa瓦斯煤试件抗压强度分别降低约13.5%与39.8%，剩余弹性能指数分别降低了15.9%与43.6%；含2 MPa瓦斯煤试件抗压强度分别降低约16.7%与47.2%，剩余弹性能指数分别降低了20.3%与48.5%；随着卸荷幅度的增加，煤试件力学性能不断降低，且瓦斯作用会进一步加剧卸荷劣化程度，同时随着瓦斯压力的增加，劣化程度逐步加深；此外，卸压作用能够有效降低煤体冲击倾向性，同时含瓦斯煤体经过卸荷作用后冲击倾向性指标劣化程度高于原始煤试件，且随着瓦斯压力的增加，剩余弹性能指数降低程度越高。

The study on impact tendency of coal body containing gas under unloading damage plays a key role in exploring the formation mechanism of coal and gas combined rock burst in deep underground mine. In order to explore the influence of unloading action on impact tendency of coal body containing gas, this paper carried out cyclic loading and unloading of coal body containing gas with varying upper limit under different unloading amplitude conditions. The test results show that: gas has a deterioration effect on mechanical properties of coal. Under 9 MPa confining pressure, the average compressive strength of coal specimens under 1 MPa and 2 MPa methane action decreases by 11.2% and 18.7%, respectively. Under the unloading amplitude of 3 MPa and 6 MPa, the compressive strength σ_c decreases by 12.6% and 36.5%, and the residual elastic energy index C_EF decreases by 10.4% and 16.7%, respectively. For coal containing 1 MPa gas, σ_c decreases by 13.5% and 39.8%, and C_EF decreases by 15.9% and 43.6%, respectively. For coal containing 2 MPa gas, σ_c decreases by 16.7% and 47.2%, and C_EF decreases by 20.3% and 48.5%, respectively. With the increase of unloading range, the mechanical property of coal specimen decreases continuously, and the gas action will further aggravate the unloading deterioration degree, and the deterioration degree will gradually deepen with the increase of gas pressure. In addition, pressure relief can effectively reduce the impact tendency of coal body. Meanwhile, the deterioration degree of impact tendency index of coal body containing gas after unloading is higher than that of original coal specimen, and with the increase of gas pressure, the reduction degree of residual elastic energy index is higher.