开挖隧道

To obtain both construction security and the feasibility in tunnel engineering, and to understand the contact mechanism in these complex cutting cases, this numerical approach simplifies normal wedge cutter indented into intact rock for simulating the process of fragmentation using a two-dimensional tool of distinct element method, so-named PFC2D.

故本研究以分离元素法之二维数值软体PFC2D为本；进行模拟楔形刃口正向贯入岩材之接触破坏行为，以数值耦合（PFC2D＆FLAC）之方式，先就单压及巴西试验作校验，再应用於贯切破坏之模拟，并比对贯切行为之理论模式与相关实验数据，俾能提供隧道工程与地下管道机械开挖之安全性与施工效率探讨之佐证。

The results show that the pipe grouting changes the mechanical parameters of surrounding rocks to achieve the security of engineering objectives by reinforcing surrounding rocks and bolcking the water.

研究表明：小导管注浆一方面改变了围岩的力学参数，另一方面利用浆液的固结特性可以实现堵水和加固围岩的工程目标，使隧道在开挖过程中的安全得到保障。

Therefor, the lining construction scheme of "the inverted arch is lined after the lining of the side and roof arch" is adopted in the construction of the tunnel for the water conveyance project of Dahuofang Reservoir, and then the excavation and the lining are carried out at the same time, by which the construction progress has been promoted and the total construction period of the project has been ensured as well.

为此，经研究在大伙房水库输水工程的隧道施工中采用了先边顶拱后仰拱的衬砌施工方案，实现了开挖与衬砌平行作业，从而加快施工进度，确保了工程建设总工期。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。