When the digging depth is greater than 34~ 36 meters in slight weathering hard rock or 28~ 30 meters in soft nature rock or in serious weathering hard nature rock, the tunnel scheme should be considered.

The results show that the maximum elastic specific energy in the wall of coal roadway is almost directly proportional to the square of digging depth and almost inverse proportional to the elastic modulus.

结果表明，煤层巷道两帮煤体中弹性比能的最大值与采深的平方近似成正比，与其弹性模量近似成反比。

The optimum parameters of the shovel, the influences of plane obliquity, working speed, digging depth and breadth of the shovel on the digging resistance were analyzed respectively.

分析了挖掘铲的铲面倾角、工作速度、挖掘深度、铲面宽度等因素对挖掘铲工作阻力的影响，以寻求最佳的工作参数。

At present, hidden interviewed by journalists digging depth and timely information has become common practice.

时下，隐性采访已成为新闻记者挖掘深度新闻和时效新闻的常用手段。

At last the base of the cliff is undermined. The frozen ground will have to be picked up by hand before machine digging can begin.

岩壁的下壁终于被掘空。这冻土必须挖过后才能用掘土机掘土。

A sharp hand shovel for digging out roots and weeds.

挖除根茎或杂草的尖端的手铲。

Putting the ballad and proverb into a specific time background is to restore a modern outlook of Wuhan city life, show the cultural connotation of the city; on the other hand digging some function, expanding some research value.

将谣谚放入具体的时代背景，一方面还原近代武汉城市生活的面貌、展现城市文化内涵；另一方面挖掘谣谚的功能，扩大谣谚研究价值。

Hand Digging of Bridge Pile Foundation

浅谈桥梁桩基人工挖孔

It's dry work digging in the sun.

在烈日下掘土的工作使人感到口渴。

Design of a Bionic Ditch Digger Study on the Technology Laying Drain Pipe With Pad

仿生式开沟机设计理论的研究排水管垫块法施工技术研讨

Development and Appliance of Ditch Digger in Crop Plot Test

农作物小区试验开沟器的研制与应用

Compute and analysis of groundwork bearing capacity for jet underwater ditch digger

喷射式水下挖沟机地基承载力计算分析

Computing and analyzing the reliability of ditch digger under many loads, such as the pull, the drag of ocean current and the edaphic drag.

计算分析了挖沟机在受到牵引力、海流力、土壤阻力等多种载荷作用下的可靠性。

He said to the hole digger, I appreciate how hard you work, but what are you doing?

他对掘洞的人说：「对于你那困难的工作我深怀感激，不过你在做什麽呢？

Study of screw auger parameters of mounted hole digger on the basis of MATLAB

基于MATLAB挖坑机螺旋钻头参数的研究

The theory evaluation and the experimental verification of the special pair of hole digger flexural vibration

挖坑机弯曲振动特征对的理论计算与实验验证

Regular Patterns of Loading Distribution of Auger Face for Mounted Hole Digger

悬挂式挖坑机钻头螺旋面载荷分布规律初探

The Measuring Method Screw Auger Load of Mounted Hole Digger

悬挂式挖坑机螺旋钻头载荷测试方法的研究

Dynamic Analysis of Torsional Vibration for a Hole Digger

挖坑机扭转振动特征对的动力学分析

Optimal Control of Lateral Vibration Dynamic System for A Bit of Hole Digger

一类挖坑机械钻头横向振动系统的最优控制问题

Parameters Optimization and Experiments of Potato Digger Blade Based on Computer Simulation

基于计算机模拟的挖掘铲参数优化与试验分析