Method for shield sandy muck improving capacity enhancement and parameter determining
A technology for muck soil improvement and parameter determination, which is applied in the direction of earth square drilling, mining equipment, tunnels, etc., can solve the problems of ignoring the basic improvement performance of foam agent and water, and increasing the cost of muck soil improvement, so as to achieve a clear idea of the method and avoid engineering Cost-increased, easy-to-achieve effects
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] A method for determining the improvement parameters of shield tunnel sandy muck soil based on foam injection ratio and water content, comprising the following steps:
[0041] Step 1: Select soil samples from the stratum in the section where the earth pressure balance shield tunnel passes. For the convenience of soil sampling, the same soil sample can be taken from the foundation pit near the shield section to determine the initial water content of the stratum.
[0042] The second step: evaluate the foaming agent, measure the foaming rate FER of the foaming agent under atmospheric pressure and the dissipation time curve of the foam produced by the foaming agent, the FER is required to be greater than 10, and the half-life t of the foam is required to be obtained according to the foam dissipating time curve 50 More than 5min, only meet FER...
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