Novel soft soil foundation pit excavation method

Abstract

The invention discloses a novel soft soil foundation pit excavation method. The invention aims at solving the problems that the large-area soft soil foundation pit has the disadvantages of excavating difficulty, high cost of support, long construction period and large after-construction settlement in the prior art, and achieving the soft soil foundation pit excavation after reclaiming land around sea. The excavation method provided by the invention comprises the steps of vacuum preloading ground treatment and foundation pit excavation, and is characterized by treating the soft soil ground pit by the vacuum preloading and excavating the foundation pit by making a slope; for the multi-layer basement deep foundation pit whose excavation depth exceeds 5 meters, the excavation of making a slope is difficult to meet the requirement, the foundation pit excavation can be also carried out by the supporting forms, such as bored pile with inner support, underground continuous wall supporting and the like. Compared with the traditional bored pile, the method saves the cost, simplifies the foundation pit excavation construction process and saves the construction period.

Description

technical field [0001] The invention relates to a novel foundation pit excavation method for soft soil foundations, which is particularly suitable for excavating foundation pits for soft soil foundation pits in coastal areas. Background technique [0002] Large-scale land reclamation projects and coastal zone development projects along the coast of my country are developing rapidly. The coasts of Tianjin, Jiangsu, Guangdong, and Zhejiang are all reclamation from the sea on a large scale, and these areas are mostly silty soft soils with high water content and high compressibility. Taking Wenzhou coastal industrial belt as an example, its soil has low strength, high sensitivity, high moisture content, high compressibility, and is in a flowing state, which is a typical weak soil foundation. [0003] Before the present invention, the excavation of the foundation pit on the weak foundation of Wenzhou coastal dredging fill had great difficulty in excavating the foundation pit, di...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing problems such as difficulty in excavating large-area soft soil foundation pits, high foundation pit support costs, long construction period, and large later settlement, so as to realize the foundation pit excavation of weak soil foundations after land reclamation dig; in order to realize these difficult problems, realize the purpose of foundation pit excavation of soft soil foundation, the present invention proposes a kind of novel method of excavation of foundation pit of weak soil foundation, the method step is vacuum preloading ground treatment and foundation pit excavation, It is characterized in that vacuum preloading is used to treat the weak soil foundation and combined with sloping excavation to excavate the foundation pit; for multi-storey basement deep foundation pits with an excavation depth exceeding 5 meters, sloping excavation is difficult to meet the requirements. It is also possible to excavate the foundation pit by using bored piles combined with internal support, underground diaphragm wall support and other support forms;

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