rock-face

The rock thrust observation of working face is an important measure in fully mechanized coal mining process and reliable basis for determining the model of support for working face and the mining process.

综采面矿压观测是综合机械化采煤工艺中一项很重要的措施，它为确定综采工作面支架选型以及采煤工艺等的选取提供了可靠的依据。

( of a cliff, rock-face, etc) rising very steeply

（指悬崖、石壁等）陡峭的，壁立的

It is pointed out that groundwater flows through the passage that consists of the slide face and the top splay fracture of a rock slope produces static water pressure of splay fracture, flotage and haulage of slide face.

指出地下水在边坡后缘张裂隙和滑动面形成的渗流通道中运动时，对滑体将产生3个方面的力学作用：张裂隙静水压力、滑动面扬压力和拖曳力；

He managed to cling on to a ledge 40ft down the rock face...

他设法紧紧地攀在了距岩壁顶端 40 英尺的岩礁上。

a protrusion on the rock face

岩石表面的突起部分

He was struggling to hold onto a rock on the face of the cliff.

他奋力想要抓住悬崖壁上的一块岩石。

A high, steep, or overhanging face of rock.

岩石的陡峭而高的一面.

Through the present calculation of rock mass stability, it is considered that the angle 6 between the force acting on the breaking face and the normal direction of the face would be more appropriate to take the angle of internal friction of rock.

通过对目前稳定岩体的计算，认为内破裂面作用力与法线夹角δ值取岩石内摩擦角比较合适。

The climbers had to negotiate a steep rock face.

攀登者必须攀越陡峭的岩壁。

He managed to cling on to a ledge 40ft down the rock face.

他设法紧紧地攀在了距岩壁顶端40英尺的岩礁上。