A long-distance continuous measurement method for soil strength parameters in soft soil sites

A measurement method and long-distance technology, applied in the fields of geological engineering and geotechnical engineering, can solve the problems of increased engineering cost and time, limitation, impracticality, etc., and achieve the effect of reducing time cost and economic cost and improving engineering safety.

Active Publication Date: 2021-02-26
DALIAN UNIV OF TECH
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Problems solved by technology

However, for large-scale and long-distance sites, this type of test method has been greatly restricted in practical application.
The change relationship of soil strength parameters within a certain area can be obtained by setting more vertical drilling points. However, due to the large increase in engineering costs and time caused by the increase in test points, this scheme becomes unsuitable in actual engineering. practical

Method used

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  • A long-distance continuous measurement method for soil strength parameters in soft soil sites
  • A long-distance continuous measurement method for soil strength parameters in soft soil sites
  • A long-distance continuous measurement method for soil strength parameters in soft soil sites

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Embodiment

[0028] This embodiment is a long-distance continuous measurement method of soil strength parameters in soft soil sites. The experimental method is simple and can realize continuous measurement of horizontal long-distance soil strength parameters, and can be used for underwater oil and gas pipelines, cables and other structures. design and construction.

[0029] see figure 1 , the method for measuring soil strength parameters provided in this embodiment can be completed by dragging the towing device once laterally. The towing device includes a towing structure main body 4, a CPT probe 5, a towing roller 6, a counterweight 7 above the top plate, a hollow rib plate 8, a rotating screw 9, a towing structure top plate 10, a cable pull ring 11 and a CPT probe mounting support 12. The CPT probe 5 is connected with the CPT probe mounting support 12; the CPT probe mounting support 12 is fixed at the front end of the towing structure; all the CPT probes 5 adopt the same specification. ...

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Abstract

The invention provides a long-distance continuous measurement method for soil strength parameters in soft soil sites. The undrained soil shear strength measurement device is arranged at the front end of the towing device, and the towing device actively or passively walks in the soft soil layer to ensure that the towing device is walking The middle part penetrates into the soil layer to be tested, and its penetration depth is controlled by adjusting the upper counterweight and dragging angle of the towing device. The method proposed in the present invention breaks through the limitation that the traditional single-point vertical measurement method cannot obtain continuous soil strength parameters along the parallel direction of the surface, and can complete the horizontal long-distance continuous on-site measurement of soil strength through a drag test. The measured strength parameters It can be used to guide the design and construction of breakwater projects, submarine oil and gas pipelines, cables, optical cables and other projects. Especially with the increasing development of deep-sea oil and gas resources, it is of great significance to rely on the method proposed in the present invention to measure the strength parameters of the seabed soil and apply it to the design and stability evaluation of engineering facilities such as submarine pipelines and submarine cables.

Description

technical field [0001] The invention belongs to the fields of geotechnical engineering, geological engineering and the like, and relates to a long-distance continuous measurement method for soil strength parameters in soft soil sites. The method is especially suitable for underwater pipeline design and investigation of soil strength parameters before construction. Background technique [0002] Accurate measurement of soil strength parameters is the basis of all engineering implementation. As a kind of unfavorable geological soil, soft soil generally has the characteristics of high natural water content, large natural void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, and poor water permeability. Therefore, the design and construction risks of soft soil sites are relatively high. In engineering practice, realizing accurate measurement of soil strength parameters in soft soil sites is of great sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/02
CPCE02D1/022
Inventor 于龙韩云瑞杨庆
Owner DALIAN UNIV OF TECH
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