微型钢管桩桩间土滑塌机理与监测验证

发布时间：2018-04-16 12:23

本文选题：钢管桩 + 桩间土滑塌　；参考：《地下空间与工程学报》2015年06期

【摘要】：桩间土滑塌是基坑工程中经常出现的一种破坏形式,对基坑工程的安全产生重大威胁,因此,研究桩间土滑塌的条件和机理就显得尤为重要。本文结合某微型钢管桩基坑支护工程桩间土滑塌实例,对桩间土滑塌的机理进行了详细的研究和阐述,并结合全自动远程实时监测装置测得的地表沉降数据辅助验证。研究结果表明:桩间土的滑塌可分为桩间土拱形成、蠕变与塑性变形、桩间土拱破坏三个阶段,滑塌的触发原因为地下水位回升,导致土体抗剪强度降低,土拱破坏;采用自主研发的全自动远程实时监测系统能够及时准确的测量出地表沉降,并反应出基坑开挖、气温变化及降排水条件等对坑周土体地表沉降的影响,对保障基坑安全施工有重要的意义。
[Abstract]:Soil collapse between piles is a common failure form in foundation pit engineering, which poses a great threat to the safety of foundation pit engineering. Therefore, it is very important to study the condition and mechanism of soil collapse between piles.In this paper, the mechanism of soil collapse between piles is studied and explained in detail with the example of soil collapse between piles in a miniature steel pipe pile foundation pit supporting engineering, and the ground subsidence data measured by automatic remote real-time monitoring device is used to verify the mechanism.The results show that the collapse of soil between piles can be divided into three stages: the formation of soil arch between piles, creep and plastic deformation, and the failure of soil arch between piles. The trigger reason of the collapse is the rise of groundwater level, which leads to the decrease of soil shear strength and the destruction of soil arch.The automatic remote real-time monitoring system developed by ourselves can measure the ground subsidence in time and accurately, and reflect the influence of excavation, temperature change and drainage conditions on the surface settlement of soil around the pit.It is of great significance to ensure the safe construction of foundation pit.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：北京市教育委员会科技计划面上项目(KM200910005012) 城市与工程安全减灾教育部重点实验室项目(2013ZD01)
【分类号】：TU473.1

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