Dewatering Construction Method of Deep Foundation Pit Combination Well in Confined Water-bearing Aquifer
A technology of confined aquifer and construction method, which is applied in the directions of infrastructure engineering, earthwork drilling, flushing wellbore, etc., can solve the problems of arranging more dewatering wells, etc., and achieve the effect of improving environmental friendliness and reducing engineering costs.
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Embodiment 1
[0032] The dewatering construction method of a deep foundation pit combination well in a pressurized unconfined aquifer comprises the following steps: (a) determining the location of the drilling hole, inserting a casing at the wellhead into the soil layer, and the top of the casing is 0.2m from the ground; The soil layers are sealed by cohesive soil or grass braids; (b) install the drilling rig so that the drilling rig faces the casing and drill to the design depth, and the specific gravity of the mud during the drilling process is greater than the formation collapse pressure; Inject low-density mud and circulate the mud until the specific gravity of the mud in the well is 0.05g / cm lower than that during drilling 3 , after the returned mud does not contain any sediment, trip out the drill; (d) run the well pipe continuously to the bottom of the well, set the part of the well pipe facing the phreatic aquifer and the confined aquifer as the water filter pipe, and each section of...
Embodiment 2
[0034] In the dewatering construction method of deep foundation pit combined well in pressure-bearing unconfined aquifer, on the basis of embodiment 1, clear water is used to make mud naturally during the drilling process in step (b), and the mud proportion is controlled by ground solid control equipment. After drilling to the designed well depth in step (b), the drill pipe is lifted up by 0.5m, and the displacement is increased for in-situ punching drilling. The maximum outer diameter of the centralizer is 5 cm smaller than the diameter of the hole drilled in step (b). The mesh number of the filter pipe is 40 mesh. The filter material facing the phreatic aquifer layer is gravel; the filter material facing the confined aquifer layer is divided into an inner layer and an outer layer, wherein the inner layer is melon stone and the outer layer is gravel. The diameter of the hole drilled by the drilling rig is 300mm larger than the outer diameter of the well pipe.
Embodiment 3
[0036] On the basis of embodiment 1, the dewatering construction method for a deep foundation pit combination well in a pressurized unconfined aquifer further includes a step (h): digging a gravel blind ditch around the well head. The inner wall of the gravel blind ditch is paved with flake material, and the particle size of the flake material is 100-600 mm; the gravel blind ditch is filled with reverse filter particles, the particle size of the reverse filter particles is ≤50 mm, and the mud content is ≤ 5%, sand content ≤ 4%.
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