The stability of the goafs of Liangshi gypsum deposit is mainly influenced by the small thickness,water-absorption and low strengths of compression and shear of the upper walls of the orebodies;and by the clearages and bedding ;as well as the undergraound water activity and irregular mining.

兩市鎮(zhèn)緩傾斜石膏礦床采空區(qū)穩(wěn)定性的影響因素，主要有礦體頂板硬殼——青膏層的厚度薄，易吸水軟化很黄很黄的免费视频在线观看，抗壓抗剪強度低日韩精品视频免费看；區(qū)內(nèi)局部節(jié)理發(fā)育、層理密集成年人欧美片；地下水活動以及開采不規(guī)范等。

It indicated that mining technique in the condition of floor failure used above Longwall Goafs in Baijiazhuang Mining is totally feasible.

這表明操射网站，挖掘技術(shù)條件下的地板上面使用失敗的實驗Baijiazhuang礦區(qū)采空區(qū)完全可行国产又粗又大又长免费视频。

The ground deformation computing problem of goafs of highways is one of the difficult problems in highway construction, and until now there is no perfect computation methods to settle with.

采空區(qū)地面變形計算問題是一直困擾通過采空區(qū)高速公路建設(shè)的難題，之前尚無良好的理論計算方法久久网性爱!。

A brief survey is given about the principles of structural design and lectotype of buildings on goafs, and related suggestions are presented for the walling construction measures.

闡述了采空區(qū)建筑結(jié)構(gòu)設(shè)計與選型的原則那有毛片网站，并就墻體構(gòu)造措施提出了有關(guān)建議。

Targeting at the coal seam with useful value discarded above goafs, attempted to explore the feasibility of "mining technique in the condition of floor failure" from theoretical point of view, and predicted.

針對在廢棄煤層采空區(qū)上方和實用價值精品视频在线观看九九，試圖探討&挖掘技術(shù)的可行性條件下的地板上失敗&理論的觀點日韩大陆一区二区三区在线观看AV，并預(yù)測。