Double-wall closed soil sampling method and device for soft soil

Abstract

The invention discloses a double-wall closed soil sampling method and device for soft soil. The method comprises the steps that A, double-layer sampling pipes are connected to soil sampler connectors and fixed through pins; B, a double-wall closed soil sampler is placed down into the bottom of a hole and pressed into soil for sampling; C, in the soil sampler pressing-in process, a lifting rod moves downwards along with the soil sampler; D, after the soil sampler is pressed to reach the depth, the soil sampler is pulled out upwards after the sampling pipes are closed; E, after the soil sampler is lifted to the ground, whether the sampling pipes deform or not is detected; F, soil samples are conveyed to a laboratory, closed and kept upright after being sampled out. According to the double-wall closed soil sampling method and device for soft soil, the inner and outer layer sampling pipes are connected with the sampler connectors through the pins, the inner layer sampling pipe is formed by splicing five identical rectangular steel plates along long edges in a contact mode, and a soil breaking piece is located at the lower end of each steel plate and connected with the inner layer sampling pipe through a hinge. The method is easy to implement, operation is easy and convenient, the structure is simple, stability and reliability are achieved, the soil sampling quality is high, and the sampling rate is improved.

Description

technical field [0001] The present invention relates to the technical field of soil exploration, more specifically to a double-wall closed soil extraction method for soft soil, and also relates to a double-wall closed soil extraction device for soft soil, which is suitable for tailings ponds, Related industries in the field of geotechnical engineering such as dams and buildings carry out sampling of Class I soft soil silt, and samples of this standard level can provide test samples for physical and mechanical tests or soil layer division of soft soil. Background technique [0002] Engineering geological survey is a geological survey and research work to find out the geological factors affecting engineering buildings, and to provide a basis for determining protective measures to ensure the stability and normal use of buildings. With the demand and development of my country's economic construction, and the increase of various large and medium-sized geotechnical engineering pro...

AI Technical Summary

Problems solved by technology

The main problem is that after sampling, the thin-walled soil extractors are usually pulled off or twisted to separate the sample soil from the subsoil, which not only easily disturbs the sample, but also easily causes the lower soil to fall off, reducing the sampling rate. At the same time, when the soil fetcher extracts the sample upwards, it depends entirely on the friction between the soil sample and the pipe wall to maintain the soil sample, which will also cause a certain disturbance to the soil sample; after the soil is lifted to the ground, the sample is lifted from the pipe wall In the process of rolling out, due to the contact friction between the soil and the pipe wall, it will cause the secondary disturbance of the soil

Images