用于中小规格冲击钻及旋转勘探钻具，凿进软岩层、中硬岩层。
For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
以黏弹性流变模型理论为基础，建立软岩层、水泥环和套管流变耦合的力学模型。
Based on the theory of the viscoelastic rheological model, the coupled mechanical model of the soft rocks, the concrete sheath and the casing is developed.
阐述了软岩层回采巷道支护的关键问题，对不同岩性的回采巷道支护方法及改进方向进行了初步探索。
Expounded support key problems of soft rock actual mining roadway and probed into the support pattern along with improvement support methods for mining roadway.
这种技术利用了这样一个事实：声波在盐岩层中传播要比在周围的软沉积物中传播得快，例如在美国的墨西哥湾岸区。
This technique takes advantage of the fact that sound travels faster through the salt than the surrounding soft sediments, such as in the US Gulf Coast.
第三系岩层属中软岩。
在软硬相间的层状岩体中地应力分布很不均匀，应力大小与岩层硬度具有正相关性，硬岩中的水平应力大于软岩的水平应力。
The stress distribution is far from uniform in this stratified rock, the horizontal stress magnitude in hard rock layers is significantly higher the that in soft layers.
针对上硬下软近水平双层岩基的破坏过程，考虑软弱下伏岩层对应力分布的扩散效应，提出双层岩基极限承载力的计算方法。
On the basis of analyzing the failure process and considering the influence of stress spreading, the method determining ultimate bearing capacity of double layer rock foundation is put forward.
由于软岩为强度低、孔隙度大、胶结程度差、含有大量膨胀性粘土矿物的松散、软弱岩层。
Because soft rocks have low strength and high porosity and contain large amount of expansive clay minerals, the freezing-thawing process of soft rock is complicated.
该站点提供大量热带土壤的剖面图，如：秘鲁的旱成土、肯尼亚的变性土、尼日利亚的淋溶土、泰国的软土、巴西的灰土、红土岩层等。
This site offers images from the tropics e. g. pictures of soil profiles: aridisol in Peru, vertisol in Kenya, alfisol in Nigeria, mollisol in Thailand, spodosol in Brazil, laterite outcrops etc.
长沙地区红砂岩层以软硬岩交互沉积而成，其软岩具有强度低、抗风化能力差、遇水软化和失水崩解等特殊力学性质。
The special mechanical properties of the soft layer has low strength, weak resistance to weathering, soften by water and collapse after losing water.
随着矿井采深的增加，巷道顶底板岩层表现出软岩特性，常导致巷道形成严重的底臌。
With the increasing of mining depth, the roof-floor lithology of the tunnel shows the characteristics as soft rock, normally resulting in the drift floor-heave.
随着矿井采深的增加，巷道顶底板岩层表现出软岩特性，常导致巷道形成严重的底臌。
With the increasing of mining depth, the roof-floor lithology of the tunnel shows the characteristics as soft rock, normally resulting in the drift floor-heave.
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