The Deterioration Law Of Frozen Rock During Freeze-Thaw Cycles In The Tibetan High Altitude

In academia accepted definition frozen rock is defined as the rock mass containing water freezing to ice inside in the temperature at zero or negative temperature conditions. Now the study of permafrost is already very mature, but there is no clear description of the system theory deterioration Injury Law for the rock mass that diverse nature of the soil under the conditions of freeze-thaw cycles. In Tibet Basu-Bomi region, for the need of the country’s economic development, there are many engineering in the construction to be built in cold regions. These projects inevitably face the threat of frozen-thaw rock disaster. Therefore, this article starting from the survey sample analyzed freeze-thaw cycle degradation and deterioration nature law of frozen rock mass in Tibet Basu-Bomi region.First, through previous research and site field investigation combing with the local hydro geological and meteorological data we partition the area of the project. In BoShula ridge bounded, Bomi region is moist and in the low temperature, good vegetation cover, less frozen rock outcropping. In another side Basu region is in a high drying temperature, vegetation cover rarely visible damage during freeze-thaw cycles rock outcrops. According this we estimate freezing and thawing effect significant elevation surface of this two different areas. This is very helpful to the volume calculate for the freeze-thaw cycles in frozen rocks disasters..Then get rock samples from the field, transported back to the lab prepared standard sample, then set temperature range to-20℃ to 20℃, performed 50 freeze-thaw cycle test in 6h frozen and 6h thawed at room temperature circulation in a total 12h. According to different groups of rock samples for 0 times,10 times,20 times,30 times,40 times,50 times of freeze-thaw cycles. Performed quality, appearance and other macro-characterization measurements and Physical and mechanical tests of ultrasonic velocity, uniaxial compression test. According to the data obtained this article analysis effect like water saturated or not, rock microstructure, the number of freeze-thaw etc. of different factors on the effect of freeze-thaw cycle deterioration. As well freezing and thawing cycles’ deterioration injury of the physical and mechanical characteristics such like materials of brittleness, peak strength, elastic modulus.Finally, contacting the foregoing experimental data this article derived comprehensive freeze and damage variable loads formula from two aspects witch is meso damage and macro deterioration. The formula match the experimental data comparison. The formula expresses the load and freeze together to make the overall degree of deterioration intensified. But the coupling interaction makes the overall impairment weaker than superimposing two injury. After substituting real data, this article got total damage variables of three different lithological rock in the study area. This could made some significance for the following the construction.