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Guangzhou University City section of immersed tube tunnel geotechnical investigation

Prohibited in the project waterway near Crown Island sand. Creek from the Guangzhou-chip network statistics look at tide stations, water stations in Guangzhou buoy plant nearly 100 years of flood tide position measured upward trend year by year, the best place 40 years before the average 1.72m, after the 50 year average of 2. 05m. 2O century, particularly after the age of 70,[link widoczny dla zalogowanych], the measured increase in flood tide bit rates up to 1.3cm / a, making flood control in Guangzhou (tide) even more severe. According to analysis, extended estuary sediment, human activities narrow river, wading buildings (including a number of bridge piers) of water blocking, creek together Chung Yung Wai sluices to reduce the storage capacity and other factors leading to flood tide position reasons for the increase year by year. In view of the flood protection in Guangzhou (wave) situation is grim, engineering programs designed to take full account of river flood as little as possible. Bed depth in the tunnel section shown in Figure 3. 6.46.2g6.05.85.61955 Year 1987 1974 1964 1991 2004 2001 1997 Figure 3 bed depth in the tunnel section 5 to determine soil physical and mechanical parameters in accordance with national standards \\obvious outliers, but also be removed. Formula for calculating the parameters as follows. (1) average formula fm = nΣ ~ _-i1 (2) standard deviation formula oi: √ [Die I (Die) / n] (3) coefficient of variation formula (4) the standard value formula: y. fm, where: 1 ± f +1,4 n17, I type in - the test value of geotechnical parameters; n - participation statistics, the number of sub-samples; - statistical correction factor, where the adverse combination of consideration by the sign. Statistics in the geotechnical parameters, according to norms relevant provisions of the calculation of ultimate limit state geotechnical parameters required (such as the shear strength of rock and soil) using the standard indicators of the value of limit state calculations require geotechnical parameters ( such as compressibility, compression modulus, permeability coefficient) using indicators, on average, when the variability is large, can be adjusted according to local experience; evaluation of rock, soil characteristics required geotechnical parameters (such as natural heavy, natural moisture content, liquid limit, plasticity index, saturation, relative density, water absorption and thickness of soil, etc.) using the average; when the number of statistical indicators of less than 6, does not calculate the standard deviation, and in accordance with indicators range values and averages, combined with local experience, are given by value. 6 Conclusion immersed tube tunnel sections were designed according to survey data and the immersed tube section of the underwater foundation trench dug test, test foundation trench dug in the process, the construction workers doing the construction site in the detailed records of the same time, each section into the thousands of on-site sampling. Foundation trench dug test SK0 +661 ~ SK0 +721 north section of the upper residual sandy soil, the whole mixture of weathered gneissic rocks,[link widoczny dla zalogowanych], dredging up more easily, but when the average deepening of a 7.8m (into the Weathered rock about 2m) more difficult, the south foundation trench SK0 +721 ~ SK0 +741 section, the upper rock sandy clay soil residual, full-chip mixed-weathered and weathered rock. From the above we can see the various sections of the samples: after the test dig rock color is brown, brownish red, shiny dark,[link widoczny dla zalogowanych], hard core was earthy, rock has been strongly weathered, weathered rock mixed full-and part of the core relatively intact rock. Verified by excavation, dredging after the geological survey of geological cross-section and cross section details the basic non-discrimination, a university in Guangzhou City of Biological Island immersed tube tunnel section of the basic accuracy of survey data,[link widoczny dla zalogowanych], the scientific guidance of the design and construction.
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