CAJ | 학술논문

根据大断面厚顶煤巷道顶板的破坏特性，考虑了顶板围岩应力水平与支护荷载的影响，利用Hoek-Brown强度准则及其相关联的流动法则，构造出厚顶煤巷道顶板的冒落破坏机构。基于塑性力学中的上限分析方法，结合变分原理，推导得到了大跨度厚顶煤巷道顶板的冒落破坏机制，并以赵楼煤矿某巷道现场实践为例，分析了不同计算参数对顶板冒落破坏机制的影响。计算研究表明：随着岩体经验参数A、抗拉强度、抗压强度及支护荷载的增加，冒落体尺寸随之增大，而当岩体经验参数B、围岩应力及岩体重度增加时，冒落体尺寸则随之减小；冒落体尺寸代表了巷道顶板安全性能的大小，其尺寸越大，表明使巷道顶板发生冒落破坏所需外力功越多，顶板安全性能也越高；岩体经验参数B、围岩应力水平与支护荷载对顶板围岩破裂机制影响较为显著，参数 B决定了冒落体的破裂形状，随着参数 B的增加，冒落破裂迹线的曲率不断减小；增大支护阻力是提高顶板稳定性的有效途径，其研究结果可为大断面厚顶煤巷道支护设计提供一定的理论依据。
근거대단면후정매항도정판적파배특성，고필료정판위암응력수평여지호하재적영향，이용Hoek-Brown강도준칙급기상관련적류동법칙，구조출후정매항도정판적모락파배궤구。기우소성역학중적상한분석방법，결합변분원리，추도득도료대과도후정매항도정판적모락파배궤제，병이조루매광모항도현장실천위례，분석료불동계산삼수대정판모락파배궤제적영향。계산연구표명：수착암체경험삼수A、항랍강도、항압강도급지호하재적증가，모락체척촌수지증대，이당암체경험삼수B、위암응력급암체중도증가시，모락체척촌칙수지감소；모락체척촌대표료항도정판안전성능적대소，기척촌월대，표명사항도정판발생모락파배소수외력공월다，정판안전성능야월고；암체경험삼수B、위암응력수평여지호하재대정판위암파렬궤제영향교위현저，삼수 B결정료모락체적파렬형상，수착삼수 B적증가，모락파렬적선적곡솔불단감소；증대지호조력시제고정판은정성적유효도경，기연구결과가위대단면후정매항도지호설계제공일정적이론의거。
According to roof collapse characteristics of large section roadway with thick top coal, a failure mechanism of roof collapse block, considering the influences of the stress of surrounding rock and supporting pressure, was constructed based on Hoek-Brown failure criterion and its associated flow law. Through upper bound limit analysis, the roof collapse mechanism of large section roadway with thick top coal was deduced with variational principle;and with one roadway in Zhaolou coal mine, for example, the influences of rock parameters on roof collapse mechanism were also analyzed. The calculation results show that: With the increasing of empirical parameter A, tensile strength, compressive strength and supporting pressure, the size of collapse block increases, while decreases with the increasing of empirical parameter B, the stress of surrounding rock and unit weight of rock mass. The size of collapse block represents the roof stability, larger size means more external work to expend, and the roof is more stable. The parameter B, the stress of surrounding rock and supporting pressure have significant impacts on roof collapse mechanism;and the parameter B determines the shape of failure curved surface; the curvature of failure surface will decrease with the increase of parameter B. Improving supporting pressure is an effective way to increase the roof stability, which provides theoretical basis for the support design of large section roadway with thick top coal.