Characters near strong impact loading zone in hard rock;
坚硬岩石在强冲击荷载作用近区的性状研究
Aiming at the problem of poor blasting effects that exists universally in hard rockst,he middle deep hole blasting tests were done in hard rock tunnels at Shuangyang Mine;and the blasting test results of different kinds of cutting forms have been gotten.
针对普遍存在的硬岩中爆破效果差的问题,在双阳煤矿坚硬岩石巷道进行中深孔爆破试验,得到各种不同掏槽形式爆破的试验效果,通过比较得出复式桶式掏槽完全适合于中深孔爆破,炮眼利用率高。
This paper expounds the Application of presplit controlled blasting technique in the hard rock blast,and introduces the general situation of the engineering,the design scope,the drill-and-blast technical parameters,the structure of charging and explosive load,the blasting network,and the firing order,etc.
阐述了预裂控制爆破技术在坚硬岩石爆破中的应用,介绍了工程概况、设计范围、钻爆技术参数、布孔方式、装药结构及装药量、爆破网络、起爆顺序等。
Study on application of rock hardness prediction with logging data;
测井资料在岩石硬度预测中的应用
Through analysing the drillability and blastability of hard rocks according to characters of hard rocks, suitable blasting parameters and operation way are selected, and good blasting effect is obtained.
针对坚硬岩石岩性特征 ,通过对其可钻性与可爆性分析 ,选取适宜的爆破参数及作业方式 ,获得良好的爆破效果。
hard rock coring tool
坚硬岩石井壁取心器
Drilling and Blasting Technology of Hard Rock in New Ventilating Shaft in Zhangxin Coal Mine
张新矿新风井坚硬岩石凿岩爆破技术
The hard rock in which diamonds are found is called blue ground, because it is somewhat blue.
他们把发现有钻石的坚硬岩石叫作蓝色脉岩，因为它的颜色有点蓝。
Application of Combined Slotting in Driving Hard Rock Roadway
混合掏槽技术在坚硬岩石巷道掘进中的应用
The Application of Presplit Controlled Blasting Technique in the Hard Rock Blast
预裂控制爆破技术在坚硬岩石爆破中的应用
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。
Any of various hard, dark - colored rocks, especially basalt and chert.
暗色岩一种坚硬、暗色的岩石，尤指玄武石及燧石
Of, relating to, or resembling rock, especially in hardness; stony.
坚硬的，石质的岩石的，与岩石有关的，或岩石状的，特别指硬度方面；坚硬的
Vitreous rocks are hard and shiny.
玻璃状的岩石坚硬而晶莹闪光。
This machine can bore through solid rocks.
这台机器能够钻透坚硬的岩石。
they found a bed of standstone.
这一地层的岩石非常坚硬。
Kentish rag
肯特郡产坚硬砂质石灰岩
A very hard, dense, even - textured, silica - bearing sedimentary rock used in whetstones.
均密石英岩非常坚硬，致密，结构均匀，含硅的沉积岩，用作磨石
Main influ-encing factors on rock abrasiveness are the sturdiness of rock mass and contentof hard minerals,and the coefficient of rock abrasiveness is a function of thespecific energy consumption in drilling and the content of hard minerals.
影响岩石磨蚀性的主要因素是岩石的整体坚固程度和硬矿物含量。
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，
break the hard layers of the earth and dirt?
是怎么在坚硬的岩石上破土而出，生根存活呢？
it was built on a base of solid rock; he stood at the foot of the tower.
它的底部是一块坚硬的岩石；他站在塔的底部。
hard metamorphic rock consisting essentially of interlocking quartz crystals.
坚硬的变质岩，主要由嵌合的石英晶体组成。