Method for monitoring expansion and shrinkage deformation of deep soil body under influence of hot and rainy climate

Abstract

The invention discloses a method for monitoring the expansion and shrinkage deformation of a deep soil body under the influence a hot and rainy climate. The method comprises the following steps: A. sample making and sample loading: spreading a silt layer or permeable stones at the bottom of a model groove, performing air drying on the soil sample, smashing, sieving and measuring the water content rate and density, loading the prepared soil samples in a spreading manner in layers, and sealing and standing the model groove to obtain consolidation settlement; B. wetting-drying circular test: leaching the soil samples by utilizing distilled water through a watering pot, and baking the soil samples by utilizing a reflection-type heater; C. data collection: recording each dial gauge reading, the water content rate in the soil body and the temperature in the soil body and the indoor temperature in drying and wetting process; and D. data processing: recording the numeral value of each dial gauge as an initial value of the deformation before the humidification process is implemented, and subtracting the initial value from the recorded dial gauge reading as the deformation value of the soil sample. By utilizing the method provided by the invention, the influence of the external environment on the experimental result is lowered and the reliability of the monitoring result is improved; and the method is simple in operation.

Description

technical field [0001] The invention belongs to the field of soil body monitoring in geotechnical engineering and engineering geology, and in particular relates to a monitoring method for indoor simulation of expansion and contraction deformation of different deep soil bodies under the influence of rainy and hot climate. The influence of the external environment on the experimental results is reduced, the reliability of the monitoring results is improved, and the operation is simple. Background technique [0002] Some soils (such as cracked clay, expansive soil, red soil, etc.) are particularly sensitive to climate change. Under the action of rainfall and evaporation, the moisture inside the soil undergoes periodic changes in the dry-wet cycle. During this process, uneven expansion and contraction will cause The soil produces disorderly cracks and cracks, resulting in large deformation, which seriously damages the stability of building foundations and slopes. Therefore, it ...

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Problems solved by technology

Journal of Water Conservancy, 2007, 38(10), 1186-1193) prepared the soil sample into mud and put it in a rectangular glass jar of 16cm×16cm×3cm, then put it in an oven to dry at constant temperature to lose water, and analyzed it using computer image processing technology. The development law of drying shrinkage cracks on the surface of clay, and then discusses the law of drying shrinkage deformation affected by it, but this method is only for the study of cracks on the surface of soil, and cannot obtain the deformation law of deep soil

[0004] In summary, the current indoor test method for soil expansion and contraction deformation monitoring is not ideal. Therefore, it is necessary to develop a new monitoring method for soil expansion and contraction deformation with a large-scale measurement range. More importantly, design The test method should be consistent with the actual working conditions of foundation diseases in long-drought rainfall and rainy and hot climates, and the test device should be able to measure the uneven expansion and contraction deformation of deep soil, which can be used for foundation treatment and design in southern my country. Provide theoretical basis and technical support for slope stability analysis

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