The FEM calculation results show the behavior of underground strata which obtained by calculation is mainly equal to what is acquired from the modelling test, and the increase of suspended roof's span rock salt cavity causes the increase of permeant height in overlying strata, and so does the increase of working depth.

有限元計算結果表明計算所得礦山壓力顯現(xiàn)特征與相似模擬試驗結果基本一致；溶腔頂板懸露跨距增大色综合精品，導致其上覆巖層的滲透高度升高国产精品无码A∨一区二区三区；采深增大對上覆巖層滲透高度具有同樣的影響。

In order to study the breakage of starting cut in the working face under the special conditions of big span,soft,fragmentized roof with high stress,the paper gives a detailed analysis of the breakage causes of starting cut with bolting under the special conditions in 2313 face,No.

為了研究大跨度国产精品综合美一区二三、松軟破碎頂板特级a禁片在线观看免费、高應力等特殊條件下的工作面切眼冒落問題，對該特殊條件下的荊各莊礦11煤層2313工作面錨桿支護切眼的冒落原因進行了詳細分析久久精品最新地址。

The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived.

利用機動法確定了老頂巖板初次來壓時載荷的上限值和塑鉸線的位置最新久久激情免费视频，得到了頂板巖體關鍵層的最小破斷跨距。

Based on the engineering projects, concept design of large span roof system is submitted.

以工程項目為背景国产福利久久无码91，提出了大型場館異形鋼結構屋面的概念設計問題免费AV网站噢。

This type of truss is constructed where a wider span or a less restricted roof space is required.

這種桁架主要建于跨度要求較大或屋頂空間限制較少的地方。

span roof：普通等斜坡屋頂

span of control 直屬下級人數(shù) | span roof 普通等斜坡屋頂 | span 跨度

span roof：等斜屋頂

spar 桅桿 | span roof 等斜屋頂 | span of arch 拱跨

long span roof：大跨屋蓋

大跨屋蓋:large-span roof | 大跨屋蓋:long span roof | 玻璃采光頂:glass roof

long span roof：大跨度屋蓋結構

自然通風:pneumatic roof-vent opener | 大跨度屋蓋結構:long span roof | 屋頂輪廓擬合:Roof boundary fitting

span roof WESTBANK：等斜屋頂

spar WESTBANK 桅桿 | span roof WESTBANK 等斜屋頂 | span of arch WESTBANK 拱跨