Determination method of sand karst stratum shield tunnel grouting safe karst cave distance
A technology for shield tunneling and determination methods, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficulty in ensuring the safety of engineering practices and the influence of karst cave stability, and achieve the effect of facilitating promotion and ensuring construction safety
Inactive Publication Date: 2017-04-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
The method for determining the safe cave distance above takes into account the damage to the cave due to the excavation of rock and soil during the excavation of the shield machine. The splitting effect will also affect the stability of the karst cave. In engineering practice, only considering the impact of the tunneling process of the shield machine on the karst cave and ignoring the impact of shield tail grouting on the karst cave may lead to engineering accidents, which is difficult to guarantee safety in engineering practice
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[0055] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0056] A method for determining the safe karst cave distance for grouting of shield tunnels in sandy karst strata, which is used for the construction of shield tunnels in sandy karst strata. figure 1 As shown, the tunnel 3 is located in the sand layer 1, wherein: the buried depth of the tunnel 3 is 11m, and the diameter of the tunnel 3 is 6m; taking a construction section of the tunnel 3, the cave 4 is located in the slightly weathered limestone layer 2. It is located directly below the tunnel 3, ...
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The invention provides a determination method of a sand karst stratum shield tunnel grouting safe karst cave distance. According to the determination method, aiming at the geological condition of the positions, where karst caves are distributed, under a sand karst stratum shield tunnel, a relation curve of the grouting pressure and the perpendicular distance is built through cubic spline fitting on feature points according to the mechanical balance at the boundaries of the karst caves and the transfer rule of the grouting pressing in a rock and earth mass, and therefore the safe karst distance under the tunnel designed grouting pressure is obtained. According to the determination method, the problem that in the prior art influence of shield tail grouting on the karst caves around the tunnel is not considered is overcome , more comprehensive and reliable bases are provided for determination of the karst cave treatment range, the safety of shield tunnel construction is ensured, and the determination method is simple, practical and convenient to popularize.
Description
technical field [0001] The invention relates to a method for determining construction parameters in the technical field of tunnel engineering, in particular to a method for determining a safe karst cave distance for grouting of shield tunnels in sandy soil karst strata. Background technique [0002] The rapid development of my country's economy and the large-scale construction of underground projects have created a large number of shield tunnel construction needs. During shield tunnel construction, it is necessary to use shield tail grouting method to backfill the over-excavation gap of the tunnel with a certain pressure to inject an appropriate amount of grout, so as to reduce the disturbance to the stratum, control the subsidence and deformation of the stratum, and ensure the stability of the surrounding rock of the tunnel. Stability of buildings on the ground. However, when shield tunneling is carried out in sandy karst formations, if the distance between the cave and th...
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IPC IPC(8): E21D11/10E21D9/14E21D9/06G06F19/00
CPCE21D9/06E21D9/14E21D11/10G16Z99/00
Inventor 赵相浩沈水龙吕海敏吴怀娜
Owner SHANGHAI JIAO TONG UNIV