Liquefaction discriminating device and method of pipe piece surrounding saturated sand caused by shield construction

Abstract

The invention discloses a liquefaction discriminating device and method of pipe piece surrounding saturated sand caused by shield construction. The device is characterized in that a seamless steel pipe embedded part (4) and a T-shaped embedded part (17) which are arranged in a pipe piece (9) in advance are included, one end of the seamless steel pipe embedded part (4) is provided with a seamless steel pipe temporary sealing cover (11) at the outer surface of the pipe piece (9), and the other end of the seamless steel pipe embedded part (4) extends to the inner surface of the pipe piece (9). According to the liquefaction discriminating device and method of pipe piece surrounding saturated sand caused by shield construction, a pore water pressure value and a soil pressure value of pipe piece surrounding sand can be measured effectively and accurately, then, whether the pipe piece surrounding sand caused by shield construction is liquefied is judged, the liquefying degree is judged, and then solutions are carried out to remove liquefying damage.

Description

technical field [0001] The invention relates to a device and method for judging the liquefaction of saturated sand around a segment caused by shield tunneling construction, and belongs to the technical field of shield tunneling construction. Background technique [0002] The shield method is a method of digging tunnels under the ground. Compared with other tunnel construction methods, it has significant advantages such as safety, reliability, low labor intensity and small environmental impact. It is widely used in the construction of various tunnels such as urban underground railways, waterways, power communications, and municipal public facilities. Although the shield construction technology and technology are becoming more and more perfect and improved, the subway underground excavation tunnel is carried out inside the rock and soil. Regardless of its buried depth, the construction will inevitably disturb the surrounding soil and destroy its original balance. . Especial...

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Problems solved by technology

[0004] After searching the existing technical literature, Chinese patent application number: 201410155332.7, application date: 2014.4.18, records a "method for eliminating ground liquefaction in shield tunnels in the tunnel", this technology is mainly used for municipal Elimination of stratum liquefaction in shield tunnels in public transportation projects such as rail transit can reinforce and eliminate liquefaction of the surrounding liquefied strata inside the formed shield tunnel structure, so as to solve the problem that the existing technology is difficult to solve under the condition of densely populated buildings and structures. Achieve elimination of formation liquefaction problems

However, this technology only provides the reinforcement and elimination method for the formation around the segment that is about to liquefy or has already occurred, and does not provide a method for predicting formation liquefaction

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