粉性土层中降水效果不佳分析及处理方法  

TREATMENTS OF POOR PRECIPITATION EFFECT IN SILTY SOIL LAYER

作　　者：王朝阳 殷立锋 晏姝 王彭宇 罗军涛 WANG Chaoyang;YIN Lifeng;YAN Shu;WANG Pengyu;LUO Juntao(Shanghai Changkai Geotechnical Engineering Co.,Ltd.,Shanghai 200093,China)

机构地区：[1]上海长凯岩土工程有限公司,上海200093

出　　处：《低温建筑技术》2022年第3期70-73,共4页Low Temperature Architecture Technology

摘　　要：目前城市建设的速度越来越快,基坑开挖的规模和深度也不断增加。为防止基坑内发生管涌流沙等不良地质现象,这就需要采取在基坑内降水的措施。由于工程地质和水文地质条件的复杂性以及开挖过程中遇到的突发事件,往往会出现基坑降水效果不佳现象,为保证基坑开挖的顺利进行,就需要采取相应的措施加大抽水力度。出现此类情况下可以采取在基坑内施工小口径应急降水井的措施或方法,疏干土体,降低土体内含水率,缓解降水不佳带来的影响。苏州部分基坑工程的实践,论证了此种方法的可行性,为类似工程提供了参考。此外施工小口径应急降水井在总成本和工期上较其他处理措施有一定的优势,性价比较高。With the development of the city construction,the scale and the depth of foundation pit excavations in-creases.To prevent adverse geological phenomena,such as piping and quicksand in the foundation pit,it is neces-sary to take measures to reduce water in the foundation pit.Due to the complexity of engineering geological,hydro-geological conditions,and emergencies encountered in the excavation process,poor dewatering effect of foundation pit often occurs.Corresponding measures need to be taken to increase water pumping to ensure the progress of foun-dation pit excavation.The construction of small-diameter emergency dewatering wells in the foundation pit was pro-posed to alleviate the impact of poor dewatering.The practice of some foundation pit projects in Suzhou city verifies the feasibility of this method,which provides a reference for similar projects.In addition,the construction of small-diameter emergency dewatering well has certain advantages over other treatment measures in terms of total cost and construction period.

关 键 词：粉性土 流沙 降水效果 降水井 

分 类 号：TU46[建筑科学—结构工程]