medium-hard strata

For the research on characters of cemented soil of SMW(soil mixing wall) technology in medium-hard strata is shortage,so the application in medium-hard soil is restrained.

针对SMW工法缺乏对中硬地层的水泥土性能研究,利用首例北京地区在中硬地层中地铁基坑工程采用SMW工法搅拌后的水泥土,进行了三轴压缩试验。

A new type of diamond-impregnated PDC bit was developed according to the characteristics of medium hard rock formation.

针对中硬岩层的特点设计了一种孕镶金刚石复合片钻头,介绍了其切削结构、特点及切削原理。

During the geothermal well drilling,to encounter of hard and brittle strata is very often,especially the Jurassic andesite and tuffs.

在地热井施工过程中,经常钻遇硬脆地层,特别是侏罗系安山岩、凝灰岩地层,钻进过程中产生严重跳钻现象,个别地层还产生H2S气侵,造成钻铤频繁断裂。

Parameter selection for diamond drilling in hard rocks;

坚硬地层金刚石钻进参数的选择

Research and Application of Diamond-impregnated PDC Bit or Drilling in Medium Hard Rock Formation

中硬岩层钻进孕镶金刚石复合片钻头的研究与应用

2. In flat dip layer, the seam thickness control the stability of the wall rock, the thick-bedded hard rock is stable than the thin-bedded hard rock.

② 岩层厚度在缓倾斜时对围岩稳定起控制作用，厚层硬岩整体稳定性好于薄层状硬岩。

a rigid layer of the lithosphere that is believed to drift slowly.

地球岩石圈中非常坚硬的一层，被认为在缓慢漂移。

Research on Tunneling Technology in Hard and Mix Ground by Shield Machine;

盾构在硬岩及软硬不均地层施工技术研究

A crust appears to have formed over the volcanic rubble.

火山熔岩表面似乎形成了一层硬壳。

they found a bed of standstone.

这一地层的岩石非常坚硬。

Technique of Putting in Stalk Through Pulling Apart Core in Coring with the Long Core Barrel in Sichuan Hard Rocks

硬地层拨断岩心接单根长筒取心技术

Research on the Deformation Rule of Surface Movement Caused by Mining under the Conditions of Thick Alluvium and Hard Solid Rock;

厚松散层厚硬岩层开采地表移动变形规律研究

It may be gouge of finely comminuted rock material with perhaps large blocks of the harder rocks embedded in it.

可能是磨碎的岩层物质组成的断层流，并夹杂一些大块坚硬岩石。

Research on the Minimum Rock Cover Thickness of Underwater Tunnel in Alternating Layers of Hard and Soft Rocks;

软硬岩交互地层水下隧道最小岩石覆盖层厚度研究

For the unique hard water in Dunhuang that permeates along slender crevices, there is not a single opening which it does not enter. Any soluble substance in the rock stratum will be solved and carried away in all directions.

敦煌独特的硬水，顺着细小的缝隙无孔不入地渗透，再把岩层中的可溶性成分溶解后四处搬运。

The test and popularization results of the method of putting in stalk through pulling apart core by Using the long core barrel in Sichuan hard rocks are simply presented in this article.

本文简要介绍了拨断岩心接单根方法在四川硬地层长筒取心中的试验和推广效果。

The cycle repeated over and over again, building up a series of crusty, crumbly layers.

这样的循环一次次重复，形成了一层层硬且易碎的岩层。

A rock formation in South Africa containing peridotite, in which diamonds are formed.

金伯利岩南非的一种包含橄榄岩的岩层，岩层中形成了钻石

If there had not been a hard layer of rock beneath the soil,

如果不是因为土壤下面有一层坚硬的岩石，

Study on Electroplated Diamond Bit for Extra-hard, Compact and Weak-abrasiveness Formation;

坚硬致密弱研磨性岩层电镀金刚石钻头研究

Development and Application of Wire-line Coring Bit for Hard and Compact Rock Formation

坚硬致密岩层用绳索取心钻头的研制与应用

Analysis on explosion parameters of blast seismic exploration in carbonatite rock

硬岩地层爆破地震勘探的激发因素分析