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In situ monitoring in the sand to river reclamation project dock application and analysis

To 22mm / d, 10d after the settlement rate will change to 10mm / d or less; about 1 month of intermittent construction, sedimentation rate gradually reduced to 3 ~ 5mm / d is about 3 months later, settling velocity and gradually reduced to 1 ~ 2mm / a, ~ right, and has been maintained at around this rate. Throughout the construction process, the settlement rate are controlled by the design requirements of 30mm / d range. In addition,[link widoczny dla zalogowanych], soil compressibility is small, the total settlement is not measured, observed on the last measured total settlement amount of 35.85m. 3.2 Stratified settlement based on the measured data analysis, compression of the soil mostly in less than 20m, the settlement amount increases with the depth and the additional stress decreases. Within the shallow soil compression is high, especially the lower fill pressure level within the soil 10rn in filling pressure loads have a greater vertical compression deformation (see Figure 4). Figure 4K2 +900 loads typical sections - stratified settling time of 3.3 pore water pressure curve (see Figure 5): monitoring the load of each point cross-section of a pore pressure load duration curve as filling height / m2007-4-\182oo7-5-14 ∞ O7-6-92007-7-52007-7-31200 thousand -8-26 pore pressure l / kPa a typical cross-section diagram 5K2 +900 pressure load duration curve of a sub-L 3l · technology exchange AIIHYDROPOWER2009Nol,[link widoczny dla zalogowanych], Totalr0 project area for the silt soil, silty sand, good water permeability, higher permeability, pore pressure when the loading can be quickly dissipated, soil strength increased rapidly effective, easy to produce excess pore pressure. It can be seen that the pore water pressure measurement points outside the Koko-bit change by large, along with the cyclical nature of tidal level showed a corresponding periodic variation. 3.4 The calculation takes into account the consolidation of engineering, grading load is applied gradually, the use of Terzaghi consolidation theory calculation, the formula is as follows:: mm (t-c Ap.t--Ill (1). II ) (1) lI 'a i where,[link widoczny dla zalogowanych], U't ~ AtJ multi-level constant loading, t times the average degree of consolidation as amended; for the transient loading conditions, the average degree of consolidation. : L I (Fu + Ji. Fu) (2) v: (3) ΣCi. hiCv = a (4) where, t__1, t are constant for each level of loading of the start and end times; △ P as the first n-load increments. 02468l012l4l6l8U Figure 6 +900 section Ground calculated the average degree of consolidation compared with the measured curves calculated from the measured degree of consolidation settlement curve and calculated by the classical theory of Terzaghi's consolidation comparison (see Figure 6) point of view, calculation of settlement the basic values and consolidation process is consistent with the measured values, the foundation found the actual characteristics of the consolidation process of soil mechanics, but the construction of loading period (first 6 months) for the actual loading speed faster than the design speed, measured slightly larger settlement the theoretical value. 4 Conclusions and recommendations of the project taking into account the far distance the sea sand and soil material can be close to 32 * get the actual pumping conditions, the use of a direct filling sand dikes built programs rely mainly on levee seepage slope near the water feet of precast reinforced concrete sheet piles. As soil permeability dike is good, the theory of consolidation of levee construction period to meet the requirements of speed, so the design did not specifically set plastic drain drainage measures such as vertical. Experimental results show that by in situ monitoring,[link widoczny dla zalogowanych], soil blowing sand filling in the loading process, the pore water pressure can really dissipate a relatively high speed, verify the design, while guiding the construction, effectively play an important role in situ monitoring . Although the observations obtained from the pore pressure-time curve can be seen that the dike penetration than larger, but given the short duration of the design flood and the levee bit of sand, water head difference between the duration of action is not long, therefore not easy to damage caused by ground penetration.
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