摘要
通过长达10年对广州地铁6号线柯木塱站及邻近盾构隧道沉降监测成果的统计,分析沉降形态和规律,并结合地质调查,认为形成沉降的原因是:沉降地段位于不良地质条件的花岗岩风化(深)槽区段,上覆有全新世古河道沉积的富水砂层;随着人口增加,地下水抽采量倍增;地面硬化、有组织排水等工程的实施,使天然雨水渗入地下的水量大大降低,雨水-地下水循环失衡,三者的耦合作用,导致该区域地下水位持续下降,隧道、车站以及地面也同步正相关沉降。针对上述问题,采用控制超采地下水和改扩容公共自来水的措施,实施后地下水位明显抬升,地面和隧道沉降速率大幅下降,局部点有所抬升,隧道趋稳。
Through tracking the settlement monitoring results of the Kemulang station and its adjacent shield tunnels of Guangzhou Metro Line 6 for 10 years,statistical analysis of settlement patterns and laws,combined with Geological survey,it is believed that the causes of settlement are:the settlement section is located in the granite weathering(deep)trough section with unfavorable geological conditions,covered with water rich sand layer deposited by the Holocene ancient river channel.Overextraction of groundwater as the population increases.The imbalance of rainwater groundwater circulation caused by the implementation of projects such as ground hardening and organized drainage,which greatly reduces the amount of natural rainwater that seeps into the ground.The coupling effect of the three leads to a continuous decrease in the groundwater level in the area,and synchronous positive correlation settlement of the tunnel,station,and ground.Decision making in response to the above issues:controlling overexploitation of groundwater;change and expand the capacity of public tap water.After implementation,the groundwater level significantly increased,the rate of ground and tunnel settlement significantly decreased,and some local points rose,resulting in a stable tunnel.
作者
竺维彬
张华
米晋生
黄驰
陈建党
胡怡东
ZHU Weibin;ZHANG Hua;MI Jinsheng;HUANG Chi;CHEN Jiandang;HU Yidong(Guangzhou Metro Group,Guangzhou 510330,China;Guangzhou Metro Design Institute,Guangzhou 510010,China;Engineering Case Committee of Chinese Society for Rock Mechanics&Engineering,Guangzhou 510330,China;Guangzhou Metro Safety Supervision Department,Guangzhou 510330,China;Guangzhou Metro Construction Company,Guangzhou 510330,China;Guangzhou Metro Operations Headquarters,Guangzhou 510330,China)
出处
《路基工程》
2024年第3期22-29,共8页
Subgrade Engineering
关键词
地铁运营隧道
地铁车站
花岗岩风化槽
抽采地下水
沉降
原因及防治
subway operating tunnels
subway stations
granite weathering trough
groundwater extraction
settlement
causes and prevention
