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A positioning method and soil cave technology, which is applied in the field of foundation soil survey, construction, infrastructure engineering, etc., can solve the problems of low precision and unscientific geophysical prospecting results, and difficulty in finding and locating underground karst soil caves, etc.
Active Publication Date: 2020-10-30
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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[0003] Due to the typical characteristics of karst soil caves, such as uncertain development location, strong underground concealment, and sudden disaster-causing process, it is difficult to carry out effective monitoring for them at present, and only conventional drilling and geophysical prospecting methods can be used to specifically detect them in advance. After the development location, size, buried depth and other parameters are verified, engineering treatment will be carried out
At present, there are many methods for karst soil cave exploration and positioning, such as geological drilling, geological radar, shallow seismic longitudinal wave reflection method, hole collapse elastic wave CT, high-density electrical method, microgravity, etc.; It is the most direct method to drill a hole, but its cost is high, the detection position is random, and there is a "one-hole view" vision limitation. Often no soil hole is found at the drilled hole position, and as a result, a subsidence occurs next to the drilled position. To achieve large-scale For general survey, it is necessary to reduce the drilling hole spacing to 2-3m/hole, assuming a general survey of 1km 2 area, about 110,000 holes need to be arranged, which is obviously unscientific; for physical detection methods such as geological radar, shall
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Embodiment 1
[0030] A kind of karst soil hole exploration positioning method comprises the following steps:
[0031] 1. Select the work area to carry out subsidence exploration, conduct statistics on the surface structures, surface water bodies, forest land, grassland, cultivated land and bare land in the work area, and formulate flight routes;
[0032] 2. Use the aircraft to carry non-toxic, pollution-free or low-toxic, low-hazard liquid foaming agent that meets the requirements of environmental protection, and spray it evenly on the surface of the work area. The foaming agent here is pine oil, and the aircraft can be a drone. Or low-altitude aircraft, the spraying density is generally 0.5-2L / m 2 , choose 2L / m here 2 , after spraying, the liquid foaming agent will permeate down to a certain depth along the soil, and at the same time, a part will remain in the pores of the soil. The indoor test is carried out on the soil samples randomly taken from the site to achieve the set foaming conc...
Embodiment 2
[0036] A kind of karst soil hole exploration positioning method comprises the following steps:
[0037] 1. Select the work area to carry out subsidence exploration, make statistics on the surface structures, surface water bodies, forest land, grassland, cultivated land and bare land in the work area, and formulate the search route;
[0038] 2. Use land spraying devices, such as vehicle-mounted or knapsack sprayers, to spray non-toxic, non-polluted or low-toxic, low-hazard solid foaming agents that meet environmental protection requirements. Here, sodium dodecylsulfonate is selected. The solid foaming agent is in powder form; spray evenly on the surface of the work area, and the spraying density is 0.5L / m 2 , after spraying, carry out on-site sampling in different areas such as surface structures, surface water bodies, woodlands, grasslands, cultivated land, and bare land. Indoor test, the indoor test is carried out 2 hours after the soil sample is sprayed with water, so as to...
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Abstract
The invention relates to the field of karst region soil cave collapse geological disasters, in particular to a karst soil cave exploring and positioning method. The method comprises the following steps that firstly, a working area required to be subjected to collapse exploring is selected; a spraying route is delimited for the selected area, and foaming agents are evenly sprayed till the content of the foaming agents in the earth surface covering layer soil body reaches the designed concentration; then whether bubbles are continuously generated on the earth surface or not are observed after raining, bubble generation points are marked, namely possible development positions of the karst soil cave, and finally the bubble generation points and adjacent areas are detected in detail by adoptinga conventional drilling or geophysical prospecting method to determine detailed characteristics of the soil cave. According to the technical scheme, the karst soil cave exploring and positioning method can achieve large-area, low-cost, easy-to-operate and accurate detection of the specific development position of the underground karst soil cave, can remarkably reduce the detection target area ofthe karst soil cave, and effectively solves the bottleneck problem of restricting the position of the soil cave in karst collapse monitoring and prevention at present.
Description
technical field [0001] The invention relates to the field of earth cave subsidence geological disasters in karst karst areas, in particular to a method for searching and positioning karst earth caves. Background technique [0002] Karst soil cave collapse is a common type of geological disaster in karst areas. According to incomplete statistics, there are more than 2,000 karst collapses on average in the country every year, causing direct economic losses of about 50 million yuan, threatening buildings (structures), public ( Railway transportation, cultivated land and other various infrastructures built on karst overburden and the safety of people's life and property. The main reason for karst collapse is that there are soil cavities within a certain depth (generally 3-10m) below the ground, and the inner diameter of the cavities generally ranges from 3-20m. When the soil on the top of the cavity cannot bear the relevant loads, it will collapse. , the direct manifestation of...
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IPC IPC(8): E02D1/00
CPCE02D1/00
Inventor 董平廖云平梁丹彭海游马磊余詹陶然
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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