工程地质学报
工程地質學報
공정지질학보
2014年
6期
1168-1175
,共8页
采动坡体%稳定性分析%组合楔形体%安全系数%降雨
採動坡體%穩定性分析%組閤楔形體%安全繫數%降雨
채동파체%은정성분석%조합설형체%안전계수%강우
Mining slope%Stability analysis%Combing wedge block%Safety factor%Rainfall
地下采煤通常会引起地表严重开裂，甚至发生滑坡、崩塌等地质灾害，采动坡体的稳定性研究一直是工程实际关心的问题。本文以贵州省都匀市煤洞坡采动坡体为例，在斜坡破坏机制分析基础上，采用组合楔形块体原理构建了采动坡体稳定性系数计算方程，并从实验、经验类比、采空率等方面对采动坡体的强度指标进行了综合取值，计算了采动坡体在天然、饱水及裂隙水作用下的安全系数。结果表明：煤洞坡山体是处于稳定状态的，这与坡体上的裂缝位移监测成果是相符的。但在长时间降雨或暴雨情况下，煤洞坡山体稳定性就会逐渐变差，甚至发生滑动；坡体稳定性安全系数随内摩擦角的降低而降低，随裂隙水充水高度的增加而降低；一旦后缘块体挤压前缘块体时，就会存在一个安全系数急剧降低的“阀值”。从裂缝水柱高度与降雨渗入裂缝的雨水量关系出发，建立了裂缝水柱高与降雨量之间关系式。经计算当降雨量（短时间内）超过192mm，斜坡就会失稳。
地下採煤通常會引起地錶嚴重開裂，甚至髮生滑坡、崩塌等地質災害，採動坡體的穩定性研究一直是工程實際關心的問題。本文以貴州省都勻市煤洞坡採動坡體為例，在斜坡破壞機製分析基礎上，採用組閤楔形塊體原理構建瞭採動坡體穩定性繫數計算方程，併從實驗、經驗類比、採空率等方麵對採動坡體的彊度指標進行瞭綜閤取值，計算瞭採動坡體在天然、飽水及裂隙水作用下的安全繫數。結果錶明：煤洞坡山體是處于穩定狀態的，這與坡體上的裂縫位移鑑測成果是相符的。但在長時間降雨或暴雨情況下，煤洞坡山體穩定性就會逐漸變差，甚至髮生滑動；坡體穩定性安全繫數隨內摩抆角的降低而降低，隨裂隙水充水高度的增加而降低；一旦後緣塊體擠壓前緣塊體時，就會存在一箇安全繫數急劇降低的“閥值”。從裂縫水柱高度與降雨滲入裂縫的雨水量關繫齣髮，建立瞭裂縫水柱高與降雨量之間關繫式。經計算噹降雨量（短時間內）超過192mm，斜坡就會失穩。
지하채매통상회인기지표엄중개렬，심지발생활파、붕탑등지질재해，채동파체적은정성연구일직시공정실제관심적문제。본문이귀주성도균시매동파채동파체위례，재사파파배궤제분석기출상，채용조합설형괴체원리구건료채동파체은정성계수계산방정，병종실험、경험류비、채공솔등방면대채동파체적강도지표진행료종합취치，계산료채동파체재천연、포수급렬극수작용하적안전계수。결과표명：매동파산체시처우은정상태적，저여파체상적렬봉위이감측성과시상부적。단재장시간강우혹폭우정황하，매동파산체은정성취회축점변차，심지발생활동；파체은정성안전계수수내마찰각적강저이강저，수렬극수충수고도적증가이강저；일단후연괴체제압전연괴체시，취회존재일개안전계수급극강저적“벌치”。종렬봉수주고도여강우삼입렬봉적우수량관계출발，건립료렬봉수주고여강우량지간관계식。경계산당강우량（단시간내）초과192mm，사파취회실은。
The underground mining can usually cause the surface crack and even geological disasters such as collapse and landslide.Stability of mining slope has been the practical concern.This paper takes the Meidongpo slope of underground mining as an example.It is in Duyun city of Guizhou province.The paper formulates a stability calculation equation of mining slope on combined wedge block principle.The formulation is based on slope failure mechanism analysis.The calculation of slope safety factor is carried out under the natural,water-saturated and fissure water filling situation.The comprehensive value of strength parameters is based on experiment,and analogy experience method,and mining empty rate.These results show that the Meidongpo mining slope is usually in a stable state,but its stability becomes worse in long-time rainfall or rainstorm condition,and even unstable.The safety factor of Meidongpo slope decreases as the internal friction angle decreases and the height of fissure water filling increases.Once the back block extrudes front block,there can be a threshold that the safety factor decreases sharply.It formulates a formula of depth of fracture water with rainfall from the relationship between depth of fracture water and rainfall infiltration of crack.It finds that the slope can fail when the rainfall exceeds more than 1 92mm in a very short time.
