中国矿业
中國礦業
중국광업
CHINA MINING MAGAZINE
2014年
10期
111-114
,共4页
尖点突变%大跨度巷道%顶板失稳判据
尖點突變%大跨度巷道%頂闆失穩判據
첨점돌변%대과도항도%정판실은판거
cusp catastrophe%large-span roadway%roof instability criterion
基于尖点突变理论并结合巷顶板组合梁力学模型，建立了大跨度巷道顶板系统的失稳判据。顶板失稳判据表明：巷顶板失稳的临界状态取决巷道宽度、巷顶板垂直应力及水平应力的组合。当顶板侧压大于5M Pa时，随巷宽的增大，引起顶板失稳的顶压由大变小；当侧压小于5M Pa时，不论巷宽如何，顶板在失稳时所能承受的顶压基本相同。对于跨度大于5m的巷道，随着侧压的增大，能引起顶板失稳的顶压先增大后减小。在顶压一定的情况下，大跨度巷道顶板在侧压较小或较大时都可能失稳。
基于尖點突變理論併結閤巷頂闆組閤樑力學模型，建立瞭大跨度巷道頂闆繫統的失穩判據。頂闆失穩判據錶明：巷頂闆失穩的臨界狀態取決巷道寬度、巷頂闆垂直應力及水平應力的組閤。噹頂闆側壓大于5M Pa時，隨巷寬的增大，引起頂闆失穩的頂壓由大變小；噹側壓小于5M Pa時，不論巷寬如何，頂闆在失穩時所能承受的頂壓基本相同。對于跨度大于5m的巷道，隨著側壓的增大，能引起頂闆失穩的頂壓先增大後減小。在頂壓一定的情況下，大跨度巷道頂闆在側壓較小或較大時都可能失穩。
기우첨점돌변이론병결합항정판조합량역학모형，건립료대과도항도정판계통적실은판거。정판실은판거표명：항정판실은적림계상태취결항도관도、항정판수직응력급수평응력적조합。당정판측압대우5M Pa시，수항관적증대，인기정판실은적정압유대변소；당측압소우5M Pa시，불론항관여하，정판재실은시소능승수적정압기본상동。대우과도대우5m적항도，수착측압적증대，능인기정판실은적정압선증대후감소。재정압일정적정황하，대과도항도정판재측압교소혹교대시도가능실은。
Instability criterion of large-span roadway roof is established based on cusp catastrophe theory and mechanical model of roof composite beam .The criterion shows:critical state of instability about roadway roof depends on combination of roadway width ,roadway roof vertical stress and horizontal stress . When the roof side pressure is greater than 5MPa ,the roof top pressure causing instability is from large to small with roadway width increasing ;When the roof side pressure is smaller than 5MPa the roof top pressure is all most same with any roadway width .When the roadway span than 5m ,the roof top pressure causing instability is from large to small with roof side pressure increasing .When the top pressure is a constant ,the roof of large-span roadway maybe occur instability with smaller or larger roof side pressure .
