Submarine pipeline landing section spaced soil body liquefaction resistance lifting device and method

Abstract

The invention discloses a device and a method for improving the soil resistance to liquefaction of submarine pipeline landing section interval.The devicefor improving the soil resistance to liquefaction of submarine pipeline landing section interval comprises a soil covering unit, a wave force dispersion unit and an auxiliary drainage unit, wherein the soil covering unit comprises a weighted base disposed in the trench and a temporary covering body arranged above the weighted base; the wave force dispersion unit includes a curved pad arranged in the trench backfill; the auxiliary drainage unit includes a drainage sleeve disposed on both sides of the soil weight unit and a backfill gravel arranged in the drainage sleeve. According to the device and the method for improving the soil resistance to liquefaction of submarine pipeline landing section interval, the soil is strengthened and compacted by increasing the heavy load of the soil;the auxiliary drainage unit is arranged, sand gap isreduced,and sand drainage ispromoted; and at the same time, the upper wave force dispersion unit is installed after the pipe is backfilled, and strives to further enhance the anti-liquefaction ability of the sand layer on the pipeline route of the submarine pipeline landing section, improves the stability of the soil in the landing section of the submarine pipeline, and ensures the operation safety of the pipeline.

Description

technical field [0001] The invention relates to a device and method for improving the anti-liquefaction capacity of a subsea pipeline landing section at intervals. Background technique [0002] With the rapid development of the offshore oil and gas field, the research on safety assurance of submarine pipelines is increasing. The stability of submarine pipelines is a key indicator that affects their safe production. Under the influence of various environmental loads, functional loads and accidental loads, ensuring the stability of submarine pipelines is a continuous goal. The settlement of submarine pipelines is the focus of the study of the stability of submarine pipelines, and it is also a difficult point in the coupling analysis of the pipe-soil of submarine pipelines. The main factors that induce the settlement of submarine pipelines include the initial settlement caused by the pipeline's own weight, the secondary settlement caused by the filling medium after the pipelin...

AI Technical Summary

Problems solved by technology

However, although the above schemes and measures have clear principles, they are difficult to operate in marine engineering and require high investment: for pipelines with deep liquefied sand layers, the amount of soil replacement is huge; Soil densification, one is the heavy workload, and the other is the high difficulty of offshore operations; for the idea of ​​pre-embedded pipeline support piles, there is also the problem of large engineering investment due to the large depth required for foundation piles

Images