查询词典 strata cylindricum epidermidis

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

Furthermore, the paper illustrates how to obtain topography influence depth on self-weight stress field of horizontal, homogeneous and isotropic strata.

此外，本文举例说明了如何求得地形对水平均质各向同性水平岩层的自重应力场的影响深度。

In this paper,by analyzing ground behavior measure data from the working face N101 in Qinyuan coal mine,strata pressure laws of fully mechanized top-coal caving face in three-soft seam are discussed.

通过对陕西秦源煤矿N101综放面实际观测数据进行分析，得出了&三软&复杂结构煤层综放面矿压显现活动规律，并对支架的适应性进行分析。

Screw can tolerate sand strata.

螺杆泵能耐受地层出砂。

During the operation of the salt cavern gas storage, the salt bed around the salt cavern will generate variation of stresses because of strata pressure and internal pressures of the salt cavern s.

盐穴储气库在运行过程中溶腔周围的盐层受到地层压力和溶腔内压的多重作用而产生应力变化。

Based on the efficient approach developed above, cases of foundationinhomogeneity with stiffness varying according to an exponential function along the radialdirection, and cases of foundation inhomogeneity with stiffness discontinuity and with weakinterlayer strata on the earthquake response of concrete arch dams as well as gravity damswere analyzed. It is found that taking into account the effect of foundation inhomegeneity forthe earthquake safety assessment of concrete arch and gravity dams has great significance.

在以上理论的基础上，本文充分利用比例边界有限元法能够模拟非均匀无限域的优点，合理地提出了重力坝、拱坝的非均匀无限地基模型，分别研究了地基材料弹性模量沿深度按指数变化的无限不均匀地基和地基中存在断层或软弱夹层时对重力坝和拱坝的地震响应影响。

The cusp catastrophe of connected well roof is analyzed by beam model considering the level stress contributed by the weight of strata and geological construction.

用平直梁尖点突变模型，并考虑了自重侧压压力及水平构造应力的综合作用力研究了连通井顶板的失稳突跳，得出了连通井顶板失稳的充要条件。

Thus the necessary condition of destabilization is obtained. The cusp catastrophe of connected well roof is analyzed by beam model considering the level stress contributed by the weight of strata and geological construction.

用平直梁尖点突变模型，并考虑了自重侧压压力及水平构造应力的综合作用力研究了连通井顶板的失稳突跳，得出了连通井顶板失稳的充要条件。

By analysis of the insitu stresses field of multicompound saltrock in the Block X of the Kuqa depression, it is indicated that the horizontal stress of salt formation in the middle layer is the highest, while that of overlapping or underlying strata such as salt gypsum rock containing mudstone, mudstone containing salt gypsum rock and mudstone is decreasing in order.

采用该方法对库车坳陷某地区多套复合盐层的地应力场进行分析，结果表明，中间盐层的水平地应力最高，其上、下的膏盐岩含泥岩层、泥岩含膏盐岩层、泥岩层的水平地应力依次降低。

Generally, the limiting factor is also the fact that is most deficient for people when they choice a residential space. The limiting factor is a reflection of different demanding for residential space from different people of different social strata, it is acted by social, cultural, economic and environmental factor. Urban residential space structure is according to the limiting factor.

限制性因素所反映的是不同人群、不同阶层的差异性空间需求，它是社会、文化、经济、环境等因素共同作用的结果，城市的居住空间结构是由居住的空间需求——限制性因素所决定的，限制性因素的确定须通过对城市发展背景的分析以及用社会学方法进行差异性需求分析来获得。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。