Landslide hazard monitoring and early warning earth surface clinometer threshold value judgment method

Abstract

The invention discloses a landslide hazard monitoring and early warning earth surface clinometer threshold value judgment method, and relates to a rainfall-induced landslide critical value early warning method. Monitoring data and in-situ experiment and model experiment examples during destruction of a large number of slopes are adopted as the basis, by means of the rock-soil body creep (rheology) theory, a landslide creep deformation process model is built, the relation between the rainfall landslide creep (rheology) three-stage and the slope earth surface inclination angle is analyzed, three-stage early warning critical reference values of a rainfall landslide earth surface clinometer are obtained, inspection is performed through a numerical simulation method and a field landslide remote monitoring and early warning system built by a project group, the requirement for four-stage deformation standards and early warning is met, and the scientific basis is provided for geological hazard monitoring comprehensive early warning technology decision making.

Description

technical field [0001] The invention relates to a method for a rainfall-induced landslide surface inclinometer threshold value, in particular to a method for determining the threshold value of a landslide disaster monitoring and early warning surface inclinometer. Background technique [0002] After the Wenchuan earthquake, tens of millions of collapsed landslides were induced by the loose deposits under the action of rainfall, which brought a huge threat to the post-disaster reconstruction and the safety of people's lives and properties in the earthquake-stricken areas. At present, under the premise that the state cannot provide enough funds to carry out engineering control of each landslide in the earthquake-stricken area, monitoring and early warning has become an important measure to reduce casualties and property losses. The early landslide disaster monitoring methods mainly used manual inspections, steel rulers, measuring wells, etc. to observe and observe macroscopic ...

AI Technical Summary

Problems solved by technology

At present, under the premise that the country cannot provide enough funds for engineering treatment of every landslide in the earthquake-stricken area, monitoring and early warning has become an important measure to reduce casualties and property losses

The early landslide disaster monitoring methods mainly used manual inspections, steel rulers, and measuring wells to observe and observe macroscopic phenomena, with low precision and poor stability; with the development of electronic technology, computer technology, and measurement technology, new types of monitoring have been greatly promoted. The development and application of instruments and meters, the development process of landslide monitoring methods from qualitative observation to quantitative precision instrument observation

At present, landslide monitoring still relies on the above two methods: 1. Simple observation method, which has the advantages of intuitive information, simple and economical, strong practicability, and good effect; but there are single observation content, low precision and labor intensity. Large and other disadvantages

2. Although the precision equipment monitoring method has the advantages of high precision, simple operation, strong intuitiveness, and low labor intensity, it is also troubled by many factors such as high cost of equipment, complicated installation and maintenance, and difficulty in determining the critical value of early warning.

As far as surface equipment is concerned, it mainly includes: ①. Geodetic precision surveying method (total station, level, theodolite), which can observe the absolute displacement of the landslide body, with high measurement accuracy and efficiency, and is suitable for landslides at different deformation stages Displacement monitoring; but in the case of restricted terrain conditions (visibility conditions) and meteorological conditions, the measurement workload is heavy, the cycle is long, and the degree of automation is low

②.GPS monitoring method is simple and convenient to operate, and has the advantages of all-weather, high precision, and full automation; but the measurement accuracy is low, which is not suitable for the initial monitoring of landslide deformation, and in high mountain areas, satellite signals are easily blocked, and the multipath effect is more serious , it will have a certain impact on the measurement results. In addition, GPS receivers are expensive and difficult to popularize and apply.

③.BOTDR monitoring method has high measurement accuracy, strong applicability, and good real-time stability; but it is expensive, poor in field operability, difficult to maintain, and easy to break, so it is difficult to use in the middle and late stages of landslide monitoring

④. Non-contact methods such as INSAR have a large number of acquisitions, high precision, and fast data acquisition; however, data processing is difficult, and it is greatly affected by environmental factors such as vegetation, soil, and water content, and the data is difficult to process and has poor applicability

⑤. Seam measurement method, fast investment, high precision, simple and intuitive method, reliable data; but there are difficulties in instrument installation, and it is not suitable for the middle and late stages of landslide deformation

Therefore, the reliability and accuracy of these early warning systems will be greatly affected to a certain extent.

The critical value of early warning is a long-recognized worldwide scientific and technical problem, and the determination of the critical value of surface inclinometers is rarely done by domestic and foreign researchers.

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