A composite stratum earth pressure balance shield tunneling additive selection and proportioning method
An earth pressure balance shield and composite stratum technology, which is used in earth-moving drilling, underground chambers, wellbore lining, etc., can solve the problems of selection and ratio of additives for strata that cannot be composited, and achieve significant test results and improve the improvement effect. , the effect of optimizing the ratio
Active Publication Date: 2016-10-19
BEIJING MUNICIPAL ROAD & BRIDGE +1
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Problems solved by technology
However, the above-mentioned patents cannot select the types of additives and the proportion of additives for composite formations.
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[0046] Hereinafter, an example is used to illustrate the specific implementation of the method for selecting and proportioning additives for earth pressure balance shield tunneling in composite formations according to the present invention, and the steps are as follows.
[0047] Step 1: Analyze the soil layer type and composition ratio of the face of the composite stratum
[0048]Firstly, the test soil samples were collected. The test soil samples were taken from the strata traversed by the shield. In this example, there are two soil layers within the face, a silty clay layer and a sand layer. Among them, the plasticity index of silty clay is 10.3, and the liquidity index is 0.35; the gradation curve of sand is as follows: figure 2 As shown, the content of particles with a particle size greater than 0.25mm is greater than 50%, which is medium sand. from figure 2 It can be seen that the content of particles with a particle size less than or equal to 0.075mm is about 4%, w...
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Abstract
The invention provides a composite stratum earth pressure balance shield tunneling additive selection and proportioning method. The method comprises a first step of analyzing the soil layer types and composition proportions of a tunnel face of a composite stratum; a second step of determining the additive types and ratios of single soil layers; a third step of determining the additive type and ratio of the composite stratum. In the third step, if all the single soil layers in the composite stratum have the same additive type, the additive type of the composite stratum is the same as the additive type of the single soil layers; if the additive type of at least one single soil layer in the composite stratum is different from the additive type of the other single soil layers, the additive type of the composite stratum is determined according to the content of fine particles of a soil body of the tunnel face.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for selecting and proportioning additives for earth pressure balance shield construction in composite strata. Background technique [0002] The earth pressure balance shield machine is traditionally mainly suitable for the construction of silt, muddy silt, clay and other sticky soil layers. These soil layers can often meet the shield construction requirements with a small amount of soil improvement or without soil improvement. Soil improvement requires the use of additives. With the advancement of earth pressure balance shield machine and soil improvement technology, the scope of its application of soil layers is expanding, such as sand layer, round gravel layer, pebble layer, boulder layer, residual layer, weathered rock layer, etc. Identifying additives for use in these soil layers is often difficult. Especially for composite formations forme...
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Inventor 龚秋明胡士伟姜厚停杨玉杰蔡玮翟相飞刘长剑石清宇李凌宜马震张若松李明锷杨德胜郑建张曼华李艳涛
Owner BEIJING MUNICIPAL ROAD & BRIDGE