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Construction and protection method of extremely soft rock foundation

A very soft rock and foundation technology, applied in the field of engineering construction, can solve problems such as failure to meet mechanical and other performance requirements, easy softening, disintegration, and low mechanical strength, so as to protect the natural characteristics and mechanical strength of the rock mass and clean the construction method , the effect of extending the construction period

Active Publication Date: 2018-05-25
GUANGXI COMM PLANNING SURVEYING & DESIGNING INST
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  • Application Information

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Problems solved by technology

The extremely soft rocks are mostly clay rocks with poor diagenesis, semi-diagenetic, low mechanical strength, sensitive to moisture and other environments, easy to crack when dehydrated, and easy to soften and disintegrate when exposed to water. When the foundation pit construction technology of relatively hard to hard rock is applied to the extremely soft rock construction of similar projects in large-scale projects, it cannot meet the mechanical and other performance requirements of the design

Method used

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  • Construction and protection method of extremely soft rock foundation
  • Construction and protection method of extremely soft rock foundation

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Effect test

Embodiment 1

[0026] A construction and protection method for an extremely soft rock foundation, in which a protective layer with a thickness of 0.3 to 0.5 m is reserved before the extremely soft rock foundation is excavated to the foundation surface, and then the protective layer is excavated to the foundation surface by mechanical or manual methods , Clean the base surface, and then spray the cement mortar cover with a thickness of 3-10cm on the slope surface and pour a thick concrete cushion layer with a thickness of 15-25cm to protect the base surface.

Embodiment 2

[0028] The difference from Example 1 is: the excavation of the extremely soft rock foundation adopts the blasting method, the thickness of the protective layer above the foundation surface is 1.5-2.0m, and the upper part of the protective layer 1.0-1.7m is excavated by small-dose blasting. The lower 0.3-0.5m shall be excavated mechanically or manually. For the extremely soft rock that does not need to be excavated by blasting, it is directly excavated by machinery or by hand, and a 0.3-0.5m protective layer is retained.

Embodiment 3

[0030] The difference from Embodiment 1 or 2 is: after the formation of the reserved protective layer, the excavation of the foundation surface is being carried out within 1 to 3 days, and the excavation area is controlled at 100 to 200m 2 Within the range, and do a good job of foundation pit drainage.

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Abstract

Disclosed is a construction and protection method for an extremely soft rock foundation. Before the extremely soft rock foundation is excavated to the foundation surface, a protective layer with the thickness of 0.3-0.5 m is reserved, and then the protective layer is excavated to the foundation surface in a mechanical or manual prying digging mode; the foundation surface is cleaned; a cement mortar protective surface with the thickness of 3-10 cm is sprayed to a slope wire mesh, and a fat concrete cushion layer with the thickness of 15-25 cm is poured to the bottom of the foundation to protect the foundation surface. The method succeeds in the Guangxi Youjiang river Naji navigation project, the Guangxi Youjiang river Yuliang navigation project and the Yujiang River Laokou navigation project successively, and it shows that the method is worth popularization in the construction of the extremely soft rock foundation.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to a technical method for excavating, clearing and protecting extremely soft rock foundations in large-scale projects such as hydropower or shipping hubs. Background technique [0002] Very soft rock mainly refers to rocks whose mineral components are mainly kaolinite, illite, montmorillonite, carbonaceous, sericite and hydromica, etc. Its ultimate compressive strength is generally less than 5MPa, and its softening coefficient is greater than 1.0; It has obvious engineering mechanical properties such as low mechanical strength, small deformation modulus, high Poisson's ratio, significant decrease in mechanical strength when exposed to water, easy cracking and softness due to dehydration. [0003] Excavation and construction of large-scale projects such as hydropower or shipping hubs take a long time, and the long-term exposure of extremely soft rock foun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02
CPCE02D17/02
Inventor 谢树盛米德才李耀华温庆珍李世明唐正辉罗得把黄小桂阳明慧阮志新
Owner GUANGXI COMM PLANNING SURVEYING & DESIGNING INST
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