SMW工法桩在厚砂层基坑中的应用与监测分析
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摘要
合信广场基坑施工中,对坑顶水平位移、型钢受力、锚索应力、深层土体水平位移、周边沉降及地下水位进行监测,并对SMW工法桩在厚砂层基坑中的应用效果进行分析。监测数据表明,随基坑开挖深度增加,桩顶变形和锚索应力呈阶梯式增长,锚索应力设计存在优化空间;型钢的受力最大值位置逐渐往下偏移,水泥土可分担桩体所受的弯矩;施工过程中,涌砂、涌水导致坑外地下水位的下降,会使周边沉降增大;SMW工法桩能有效控制基坑周围土体的变形并起止水作用。
Based on the monitoring consist of the top horizontal displacement, steel stress, anchor stress, deep soil level displacement, surrounding ground settlement and underground water levels during the construction process of Hexin square foundation pit, the application effect of SMW Method pile in thick sand foundation pit is analyzed. Results indicate that with the increase of depth of the excavation, the top horizontal displacement and anchor stress showed a ladder type growth. There is room for anchor stress design optimization. The position of the maximum stress of the steel is gradually downward, and soilcement can share the bending moment of the pile. The drop of underground water levels outside the pit caused by sand and water gushing will make the surrounding ground settlement increases. SMW Method pile could effectively control the deformation of soil around the foundation pit, and cut off the water seepage.
Based on the monitoring consist of the top horizontal displacement, steel stress, anchor stress, deep soil level displacement, surrounding ground settlement and underground water levels during the construction process of Hexin square foundation pit, the application effect of SMW Method pile in thick sand foundation pit is analyzed. Results indicate that with the increase of depth of the excavation, the top horizontal displacement and anchor stress showed a ladder type growth. There is room for anchor stress design optimization. The position of the maximum stress of the steel is gradually downward, and soilcement can share the bending moment of the pile. The drop of underground water levels outside the pit caused by sand and water gushing will make the surrounding ground settlement increases. SMW Method pile could effectively control the deformation of soil around the foundation pit, and cut off the water seepage.
引文
[1]型钢水泥土搅拌墙技术规程:JGJT 199-2010[S].
[2]建筑基坑支护技术规程:JGJ 120-2012[S].
[3]丁振明,王秀丽,刘军,等.SMW工法在富水非软土基坑支护工程中的应用[J].建筑技术,2010,31(5):462-464.
[4]安关峰,高峻岳.广州地铁公园前地下空间深基坑综合支护监测分析[J].岩土工程学报,2007(6):872-879.
[5]安关峰,宋二祥.广州地铁琶州塔站工程基坑监测分析[J].岩土工程学报,2005(3):333-337.
[2]建筑基坑支护技术规程:JGJ 120-2012[S].
[3]丁振明,王秀丽,刘军,等.SMW工法在富水非软土基坑支护工程中的应用[J].建筑技术,2010,31(5):462-464.
[4]安关峰,高峻岳.广州地铁公园前地下空间深基坑综合支护监测分析[J].岩土工程学报,2007(6):872-879.
[5]安关峰,宋二祥.广州地铁琶州塔站工程基坑监测分析[J].岩土工程学报,2005(3):333-337.