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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。
Soil slip between piles is often a form of damage in the excavation, which poses a significant 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 micro-steel pipe pile foundation supporting project of soil between the slip of piles example, the mechanism of piles of soil between the collapse of a detailed study and description, combined with automatic remote real-time monitoring device measured surface subsidence data aided verification . The results show that the slump of soil between piles can be divided into three stages: soil arching, creep and plastic deformation between piles and soil arching between piles. The triggering reason of slump is the rise of groundwater level, Reduce the soil arching damage; using independent research and development of fully automatic remote real-time monitoring system can be timely and accurate measurement of surface subsidence, and reflects the excavation, temperature changes and drainage conditions on the soil around the pit surface settlement, It is very important to protect the safe construction of foundation pit.