Shield tunneling construction method for water-containing sandy gravel layer to penetrate through a cultural relic protection area underneath

Abstract

The invention relates to the technical field of shield construction, in particular to a shield tunneling construction method for a water-containing sandy gravel layer to penetrate through a cultural relic protection area underneath, which comprises the following steps: S1, firstly, carrying out field investigation; S2, deeply researching the engineering geological characteristics of the rock-soil body of the sand-gravel layer; S3, carrying out shield tunneling machine model selection, tunneling adaptability analysis and key part design; S4, calculating the duration distribution characteristics and incidence relation of the shield tunneling key parameters; S5, carrying out research on the muck improvement technology; S6, carrying out analysis and research of undercrossing the earth surface of the cultural relic site and layered settlement; and S7, carrying out shield tunneling construction by the combination of various data. By means of the construction method, the shield cutter head design, the cutter type selection and the cutter arrangement scheme can be determined based on the shield interval geological characteristics and the stratum lithology, the adaptive design of other key parts is further researched and determined, and the safety of shield construction on the water-containing sandy gravel layer is guaranteed.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a shield tunneling construction method for passing through a cultural relic protection area under a water-containing sand and pebble layer. Background technique [0002] In recent years, my country's social economy has developed rapidly, and urban construction has changed with each passing day. However, due to limited urban land resources and limited urban expansion, underground space has been continuously developed and utilized. For cities with concentrated population, dense ground buildings and underground pipelines, and congested ground traffic, during the construction of the subway, no matter from the perspective of affecting urban traffic or environmental protection, the open and cut method is obviously unreasonable. Therefore, the shield tunneling method has become the first choice for the construction of subways in major cities due to its characteristics of being ...

AI Technical Summary

Problems solved by technology

The emergence of these problems is usually due to the complex geological conditions in the construction area, and the geological conditions are not fully considered during construction.

[0004] Among the many geological conditions unfavorable to shield tunneling, the water-rich sandy pebble formation is a relatively difficult one, especially in some areas where the water-rich sandy pebble formation is the main one, and there are pebbles with large particle size, high content and large particle size. Boulders, local sand and pebbles sandwiched with lens sand layers, are affected by shield excavation disturbance, over-excavation and construction precipitation, resulting in formation loss and a large loss of fine particles, and holes are formed between pebbles, which easily induce ground subsidence and subsidence, and Settlement has hysteresis and suddenness, which is likely to cause major impacts

In addition, in some large cities, there are many important cultural relics protection areas. If they are not measured, it is very likely that the ground will collapse or the house will crack due to excessive deformation of the ground during the tunnel shield excavation process.

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