昆明地铁盾构下穿昆明火车站沉降控制施工参数研究

昆明地铁首期工程是沟通昆明南、北市区的重要交通动脉，首期工程八标环城南路站-昆明火车站站区间采用盾构法施工，需下穿不间断运营昆明火车站，昆明火车站是云南省、昆明市重要交通门户的特等站，而且该处地层为滇池沉积地层，该地层结构特征多元化、软硬不均、渗透性多样、含水丰富且规律预见性差等特点，施工风险非常大。结合昆明地铁环城南路站-昆明火车站区间下穿昆明火车站的特点，以及滇池沉积层特征，提出了针对的盾构参数，包括土仓压力、出土量、注浆压力、注浆量等参数，保证了正常盾构施工及昆明火车站的安全运营。

CONSTRUCTION PARAMETERS FOR SETTLEMENT CONTROLLING OF KUNMING METRO UNDERCROSSING KUNMING RAILWAY STATION

The firstly planed lines of Kunming metro is an important traffic artery from the south to the north of Kunming city. The interval from the Southern ring road station to the Kunming railway station is designed to construction by the use of shield. The interval has to undercross the Kunming railway which is the most important transportation hub in Yunnan province. The surrounding soil is belong to Dianchi lake sediments, which some shortcoming characteristics such as diversification, hard and soft uneven, diversity of permeability, rich water content with poor regularity. To deal with the big construction risk, the paper has studied the shield parameters according to the requirement of the operation of Kunming railway station and the characteristics of the soil. As the result, the earth pressure, excavated volume, grouting pressure, grouting amount and other parameters have been brought out, which have been actually used and resulted in the safely construction of the interval and the normal operation of Kunming railway station.