英语900句

Roadway excavation and support

1、The shape of roadway section depends mainly on strata conditions，the serving life and supporting materials.

巷道断面形状主要取决于地层条件、服务年限和支护材料。

2、The size of roadway section depends mainly on its use.

巷道断面尺寸主要取决于巷道的用途。

3、It is dependent on haulage or hoisting equipment or other devices used，and it is modified according to the ventilation requirement.

它取决于运输或提升设备或其它设备的尺寸，还要根据通风要求对巷道断面尺寸加以修改。

4、The excavation technique consists of main operations including breaking, loading, haulage and support, and auxiliary work including ventilation, laying the track, digging ditches and laying pipes etc.

掘进工艺包括主要作业和辅助作业，其中主要作业包括破岩、装岩、运输、支护，辅助作业包括通风、铺设轨道、挖掘排水沟、铺设管线等等。

5、Drilling and blasting is the most widely used method of rock breaking at present.

打眼放炮是目前应用最广泛的破岩方法。

6、The type of explosive used, rock properties, and method of loading and sequence of firing the holes, affect hole depth, diameter, alignment and spacing.

采用的炸药的类型、岩石的特性、装岩方法、各个钻孔的起爆顺序，这些都影响着钻孔深度、直径、排列和间距的确定。

7、A blast round consists of cut, relief, breast, and trim holes.

一个爆破炮眼组包括掏槽眼、辅助眼、压眼和边界眼。

8、Gateway machine can excavate any size and shape of cross section: circular, horseshoe, arched and rectangular.

平巷掘进机可以掘出任何形状和尺寸的断面，如圆形、马蹄形、拱形和长方形。

9、The roof bolter is a rubber-tired vehicle used to drill and insert bolts into the roof to support it. 锚杆机是一个用来打锚杆眼安装锚杆来支护顶板的机器，它是用胶轮行走的。