Being an important part in urban mass transit , signal system plays a significant function in the safe , accurate and highly efficient traffic operation , but the incomplete design standard has caused some uncertain properties to the system designing 摘要信號(hào)系統(tǒng)作為軌道交通工程中重要的組成部分,對行車的安全、正點(diǎn)、高效的運(yùn)行起著至關(guān)重要的作用,但由于其中的設(shè)計(jì)標(biāo)準(zhǔn)不全面,給系統(tǒng)設(shè)計(jì)方案造成了一定的隨意性。
But compared with application of composite soil nail , theoretic study for composite soil nail is very laggard , so as to many engineering accidents , which brought biggish economic losses and harmful effect to society , happened because of incomplete design method , absent test study etc . therefore , study for work mechanism , design method and construction technology of composite soil nail is useful of technically perfection , and also useful of broadly application of this technology 然而,在對復(fù)合土釘支護(hù)技術(shù)的理論研究上卻相對落后,設(shè)計(jì)分析方法不完善,試驗(yàn)研究甚少,也因此發(fā)生了較多的基坑工程事故,造成了較大的經(jīng)濟(jì)損失和社會(huì)不良影響。因此,研究其工作機(jī)理、設(shè)計(jì)方法、以及施工技術(shù),將使得該項(xiàng)技術(shù)更加完善,也有利于該項(xiàng)技術(shù)應(yīng)用空間的擴(kuò)展。