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An example to discuss a project and quality control of deep excavation


④ silt layer of sand folder, the higher water level, permeability large light well to take measures to assist precipitation, the second support beam in the construction is carried out well dewatering when the initial water is about 3600m / d of a 4200m / d. While strengthening the surrounding buildings, roads and other monitoring closely the impact of precipitation on the surrounding. 4.3 Monitoring measures (1) excavation near the building before the data collection, analysis, and other issues of pre-existing cracks in the marking and record, regularly observed during the construction development of the deformation,ugg boots sale, to identify problems in a timely manner remedial measures. (2) in the excavation process, strengthen the supporting structure and foundation stability of system monitoring, done every step necessary to root out the monitoring of soil, and then monitoring the values of (top displacement piles, pile skewed, settlement) for analysis and feedback, if the monitor value mutation, indicating that the structure foundation pit to put too much pressure to slow down the speed or stop digging excavation, foundation deformation to be stable, may continue to carry out construction . Through the above measures, and virtually no preloading around foundation, Kengbi no significant leakage occurs. Subsequent monitoring data show that: pit slope top horizontal displacement and the displacement of the growth in deep soil is very slow, and full control of the design within the scope of license. 5 Construction of Problems and Solutions 5.1 is land subsidence. When the excavation in the end, a large area for pouring concrete bottom of the pit cushion, the road surface and cracks began teaching building E, in order to find out the excavation of the foundation pit during the live, on-site monitoring data detailed analysis of monitoring data deficiencies and defects in the statistics, the foundation top of the hill there is the problem of insufficient horizontal displacement has been effectively controlled, while the top of the hill,UGG scarpe, the surrounding buildings, roads, the settlement of the problem more obvious, it is mainly the initial excavation caused by large-scale precipitation, according to the situation, to eliminate the adverse effects of precipitation, decided to take the following measures: (1) pit near the north side near the inpatient additional five recharge wells, pumping up the groundwater to Bottom poured filtered back after the precipitation formation in order to balance the water table. (2) close monitoring of rainfall and groundwater wells with a water change of no more than the premise of early-warning water level gradually reduce the intensity of the work pit pumping system to minimize or reduce the pumping frequency of pumping capacity; precipitation under both well out of the water, organized and carry out pumping, ensure that the entire foundation of the water table in a relatively uniform and stable equilibrium. With these measures, in the foundation construction process, the road surface and cracks in the development of E school buildings be more effectively controlled, the effect is obvious, foundation stability and security are effectively protected. 5.2 groundwater. When the middle of a large excavation pit pit cap position, press the design requirements, the groundwater level cap should be reduced to at least cushion the following 0.5nl, but the actual excavation of the pit after the pit water level was found not to meet the design requirements, outside increase in precipitation around the well point of light not solve the problem. Careful observation revealed that: Although the high level crater pit, but the external design of the water table has dropped below the required elevation. According to the site after excavation revealed the geological situation and with previous experience in the excavation, analysis that: the bottom of the pit in the sand layer is located in the folder ④ ⑤ mud and silt layer or layers of sand interaction, the soil due to the impermeable mud sandwich effect, the vertical permeability is much smaller than the horizontal permeability; and the design of the pit crater around the curtain for the use of cement mixing pile retaining seal, nor the pit dewatering well points,ugg stivali, so the formation of soil in the pit of the product water, the water is actually interacting with the mud and the sand layer in the stagnant water, the water level is difficult with the decrease of water table decline in the external needs of local open pit in the pit digging wells,UGG milano, pumping water out with the use of the solution. Construction site the effect is obvious, pit pit design water level quickly dropped to the elevation, earth excavation can proceed smoothly. 6 results of monitoring the construction experience of the Foundation for nearly four months, the last of the monitoring results are as follows: Support the cumulative maximum horizontal displacement of pile head is 17mm, maximum vertical settlement tally l0.3mm; deep displacement of supporting piles accumulated the largest is 15.38mm, the stability of support structure that better foundation in a relatively secure state. The surrounding roads, buildings total value of the maximum vertical settlement were 42.6mm and 64.6mm, relatively large, indicating that the foundation pit on the surrounding environment has some adverse effects. 7 conclusion because the project started to attach great importance to soil excavation and groundwater issues, with contingency plans to deal with complex issues, because the measures are effective, the success of foundation construction; engineering support structure itself is not deformed, but because the base Hang precipitation measures, have a greater impact on the surrounding,ugg italia, the use of pit outside the recharge measures, a certain deformation of the surrounding environment control. [ID: 4904]