坝基固结灌浆的目的()
参考答案:
是提高基岩的整体性和强度,降低地基的透水性。帷幕灌浆的目的是降低坝底渗透压力,防止坝基内产生机械或化学管涌,减少坝基和绕坝渗透流量。
Dr. Peter Spence, headmaster of the school, told us, “ fifth of pupils here go on to study at Oxford and Cambridge.”
A./;A
B./;The
C.the; The
D.a; A
底板灰岩水突水的典型征兆为()
A.顶板挂红、挂汗
B.有臭味
C.底板鼓起、产生裂隙