Riverway bank slope ecological protection structure and dredging method under poor geological condition

Abstract

The invention provides a riverway dredging method and a riverway bank slope ecological protection structure under a poor geological condition. The structure comprises an upstream cofferdam and a downstream cofferdam of a river segment planned to be dredged, support piles on a left bank and a right bank, backfill rock blocks on the left bank and the right bank, backfill grading stone on voiding portions below retaining walls of the left bank and the right bank, an ecological plant planting bed located on the surface layers of the backfill rock blocks on the left bank and the right bank, ecological plants, and an isolation layer backfilled after riverway dredging. The bank slope stability can be ensured, the riverway local water ecology is improved, the river water self-cleaning capacity isimproved, the sewage treating period is prolonged, and the sewage treatment cost is reduced.

Description

technical field [0001] The invention relates to an ecological protection structure and a dredging method for river bank slopes under adverse geological conditions. It is mainly suitable for environmental protection dredging of black and odorous sediments of river channels by setting up ecological protection structures when the bank slope foundation of urban river courses is in poor geological conditions, and planting ecological plants on the bank slopes on both sides to improve local water ecology and improve the self-purification ability of river water. Extend the river sewage treatment cycle and reduce the cost of sewage treatment in the later stage. Background technique [0002] Urban rivers are not only channels for flood control and drainage, but also an important part of urban landscapes and ecosystems, and an important link to achieve harmony between people and water. With the passage of time and the development of the urban economy in normal urban rivers, due to the...

AI Technical Summary

Problems solved by technology

[0005] (2) The foundations of the retaining walls on both sides of the river in the coastal and urban areas along the river are weak, and most of them are built by mounding embankments or rock-filling walls. The layer is muddy, and the safety factor of the retaining walls on both sides of the river is low. During the dredging process of the river, under the action of external forces, the bank slopes on both sides of the river are prone to instability, collapse, subsidence and other damages

[0006] (3) The foundation soil of the bank slope at the bottom of the river and on both sides of the river is silty soil. During the drainage and dredging operation, the mud flowing at the foot of the bank slope will take away the soil that acts as a stable anti-slip on the bank slope, causing the river channel to The anti-sliding safety factor of the bank slopes on both sides of the river is reduced, which may easily cause damage such as instability, collapse, and subsidence of the bank slopes on both sides of the river.

[0008] (5) During the process of mechanical dredging, the insertion and lifting of the mechanical bucket in the silt or the hydraulic impact of the high-pressure water gun will cause the undulation and fall of the thin silt, and the bank slopes on both sides of the river will be dragged by the impact force of silt mud and negative pressure The action of force may lead to bank slope instability, collapse, subsidence and other damage on both sides of the river.

[0009] All of the above factors may cause bank slope instability, collapse, subsidence and other phenomena on both sides of the river. Because the buildings on both sides of the urban river are densely covered, bank slope collapse may lead to unsafe phenomena such as cracking of the buildings on both sides of the river, which will endanger the safety of people and property. , resulting in large economic losses

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