Soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing

A technology of grouting lifting and weak interlayer, which is applied in construction, soil protection, infrastructure engineering, etc., can solve problems such as the failure of subway tunnels passing through buildings, so as to avoid the reduction of tunnel excavation construction efficiency and reduce the original foundation , the effect of avoiding related risks

Pending Publication Date: 2018-11-20
HUNAN UNIV
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Problems solved by technology

[0008] In view of the above-mentioned problems, the object of the present invention is to solve the problem that the weak interlayer grouting lifts the subway tunnel passing u...

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  • Soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing
  • Soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing
  • Soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing

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Embodiment Construction

[0038] Taking a certain undercover section of Metro Line 3 in a certain city passing through the city's key protected historical buildings as an example, the technical solution will be further explained in conjunction with the accompanying drawings.

[0039] A city's key protected historical building was built in 1934 and is a six-story brick-concrete structure. The foundation is a rectangular raft foundation with a length of 45m and a width of 42m, and the buried depth is about 3.0m. Affected by sea ingress and sea regression, the urban strata are regular sedimentary layers. The stratigraphic histogram shows that, from near the surface to the depth, the stratigraphic composition is as follows: artificial filling layer → sporadic recent sedimentary layer → marine-terrestrial interfacial sedimentary layer. Larger settlements are prone to occur after excavation disturbance. The excavation span of the subway tunnel is 6.2m, and the thickness of the tunnel vault covering layer i...

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Abstract

The invention discloses a soft rock strata grouting elevating method compensating for building settlement caused by subway tunnel under crossing, and aims at the treating the earth surface building settlement disease caused by subway tunnel construction. The method comprises the steps that firstly, elevating grouting soft layer selection is conducted; secondly, soft layer pre-strengthening is conducted; thirdly, soft layer escape stop curtain construction is conducted; and fourthly, soft layer grouting elevating is conducted, and it is ensured that the building settlement value and the settlement difference do not exceed the allowed value. Through the technology that ring-direction grouting is conducted on the periphery of a soft layer to construct a stratum escape stop curtain, damage tothe native foundation due to the grouting elevating construction is avoided, and the requirement for elevating grouting equipment is effectively lowered; and the grouted soft layer is prevented from sliding and escaping towards the periphery under the load action of an overlying strata and the earth surface building, and the construction technology compensating for subway tunnel under crossing building settlement based on soft layer grouting elevating is developed.

Description

technical field [0001] The invention relates to the technical field of urban underground tunnel engineering, in particular to a method for lifting a weak interlayer by grouting to compensate for the subsidence of a superstructure caused by the underpass of a subway tunnel. Background technique [0002] 1. Due to the reasons of geological history, the strata in the coastal area are often of weak interlayer type, or soft-hard interbedded type. Therefore, in many coastal cities in my country (such as Tianjin, etc.), after the excavation of the subway tunnel, the overlying stratum often produces a large settlement, which seriously damages the structures or buildings attached to it. [0003] 2. In order to avoid the consequences of excessive settlement, the most effective measure is to select a weak layer in the covering layer at the top of the tunnel, and then use pressure grouting to lift the tunnel surface to the pre-sinking or predicted design height through this soft layer ...

Claims

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Application Information

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IPC IPC(8): E02D35/00E02D3/12
CPCE02D3/12E02D35/005E02D2250/003E02D2300/0018
Inventor 苏雅李诚诚苏永华刘少峰廖君橙
Owner HUNAN UNIV
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