Equivalent substitute material for cracked rock frost heaving and cracking and preparation method of equivalent substitute material

Abstract

The invention provides an equivalent substitute material for cracked rock frost heaving and cracking. The substitute material comprises a rock cracking agent CaO, Ti-cAo, Co-CaO, Zn-CaO or Ni-CaO, a mixture of Portland cement with the strength higher than 32.5 and/or high-alumina cement, beta-type semi-hydrated gypsum, a mixture of oxalic acid, citric acid or benzene sulfonic acid and hydrogen peroxide or sodium peroxide as well as polyurethane, polyvinyl alcohol or lignosulfonate in a water reducing agent. The preparation method comprises steps as follows: adding water to the material at the temperature of 10-25 DEG C, performing stirring to obtain slurry, performing stirring continuously until the slurry is solidified, controlling the expansion rate of the solidified substance to be 9% and the elasticity to range from 500 MPa to 550 MPa to obtain the equivalent substitute material used for cracked rock frost heaving and cracking and applied to frost-heaved and cracked crack-containing rock. The elasticity modulus of the mixture solidified substance is similar to that of ice, and the slurry can have the degradation effect, identical with that water freezing into ice, on the rock after solidified. Therefore, fracturing damage to the expanding material can be avoided under the condition that deformation and failure parameters of the substitute material can ensure that the expansion rate is 9%.

Description

technical field [0001] The invention relates to an equivalent substitute material for frost heave cracking of cracked rocks, which is applied to the equivalent simulation of cracked rocks containing cracks. Background technique [0002] The rock freeze-up cycle is a common natural phenomenon. The freeze-up has a great influence on the physical and chemical properties of the rock, and the rock is often used as the basis of practical engineering. Therefore, it is extremely important to study the change law of the rock properties with the freeze-up cycle. meaning. [0003] Conventional frost-heave tests can only be performed on standard specimens in the laboratory, but it is difficult to conduct field tests on large-scale rock mass in the field. The main reasons are: (a) the existence of large cracks; The water problem is not easy to solve, and it is difficult to achieve the effect of frost heaving under water retention in cracks. (b) It is difficult to find large-scale equip...

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Problems solved by technology

[0006] In order to solve the problems that current conventional freeze-up tests use freezing, multiple cycle times are long, the effect is not obvious, and large-volume rocks cannot be frozen in-situ in the field, etc., a mixture composed of rock-cracking agent and cement is prepared. The expansion rate curves of different mix ratios are drawn in the test, and the mixtures with different expansion rates are selected, and then the test of accelerated deterioration of fractured rocks (mixtures with expansion rates greater than 9%) is carried out.

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