本工程止水帷幕密封墙采用双轴粘土搅拌桩工艺。①定位 平整施工场地后，按

本工程止水帷幕密封墙采用双轴粘土搅拌桩工艺。<br>①定位 <br>平整施工场地后，按照桩位平面布置图确定桩位。将搅拌机移至设计桩位，<br>定位对中，桩位放样误差小于50 mm，搅拌轴垂直度（每米）允许偏差不超过15 mm。<br>②施工顺序<br>粘土搅拌桩双轴的长轴方向垂直于密封墙的方向，粘土搅拌桩采用从一端向另一端顺序连续施工。<br>③制浆 <br>泥浆池设置在加固区域边界，采用机械开挖，底部铺上塑料膜跟土工布。<br>粘土帷幕墙渗透系数小于 5*10-6 cm/s， 泥浆掺入比根据室内配合比试验，单位掺入指标为 30%。<br>完工后对泥浆池进行处理，用中粗砂填平，池内泥浆全部运至密封沟内。<br>④搅拌喷浆下沉 <br>启动电动机和灰浆泵，使搅拌机沿<br>导向架搅拌切土下沉的同时将拌制好的 泥浆压入地基中，边旋转边喷浆，保证搅拌下沉和喷浆速度是同步的，下沉的速度不大于 1.2 m/min。搅拌深度一般比 设计深度超深10~20 cm，当搅拌至桩端 时，应坐底30秒以上，保证浆液完全到桩端。钻进注浆量约 50~60%。<br>⑤ 搅拌上升<br>当搅拌头下沉到设计深度，并坐底30秒以上后，开始提升，边旋转边喷浆，提升速度不大于0.8 m/min。搅拌头提升到距桩顶1 m时，应减速，在喷浆口露出地面时，应停止提升，搅拌数秒以保证桩头均匀密实。提升注浆量约20~30%。<br>⑥ 再次搅拌喷浆下沉<br>与步骤④基本相同，区别是钻进注浆量约10~20%。<br>⑦ 再次搅拌上升<br>与步骤⑤基本相同，区别是提升注浆量月10~15%。<br>⑧ Shift the <br>mixer and repeat steps ③④⑤⑥⑦.

The sealing wall of the water-stopping curtain of this project adopts the two-axis clay mixing pile process.<br>(1) Positioning <br>After leveling the construction site, the pile position is determined according to the pile layout plan. Move the blender to the design pile,<br>In the alignment, the pile loft ingress splendor error is less than 50 mm, and the verticality of the mixing shaft (per meter) allows a deviation of no more than 15 mm.<br>(2) Construction order<br>The long axis direction of the double axis of the clay mixing pile is perpendicular to the direction of the sealing wall, and the clay mixing pile is constructed continuously from one end to the other.<br>(3) Pulp <br>The mud pool is set at the boundary of the reinforced area, with mechanical excavation and plastic film and earthen cloth on the bottom.<br>The penetration coefficient of the clay curtain wall is less than 5 x 10-6 cm/s, and the mud doping ratio is based on the indoor fit ratio test, and the unit doping index is 30%.<br>After completion, the mud pool is processed, filled with medium coarse sand, and all the mud in the pool is transported to the sealed ditch.<br>(4) Stirring spray to sink <br>Start the motor and mortar pump so that the blender is along<br>The guide frame stirs the cut soil to sink while pressing the mixed mud into the foundation, rotating the side spray, to ensure that the stirring and sinking and the spray speed is synchronized, the sinking speed is not greater than 1.2 m/min. Stirring depth is generally more than the design depth of 10 to 20 cm, when stirring to the end of the pile, should sit at the bottom for more than 30 seconds, to ensure that the slurry is completely to the end of the pile. Drilling into the pulp amount of about 50 to 60%.<br>(5) Stirring up<br>When the mixing head sinks to the design depth and sits at the bottom for more than 30 seconds, start lifting, rotating the side to spray the slurry, the lift speed is not greater than 0.8 m/min. When the mixing head is raised to 1 m from the top of the pile, it should be slowed down, and when the spray port is exposed to the ground, the lift should be stopped and the stirring should be stirred for a few seconds to ensure that the pile head is evenly compact. The amount of raised slurry is about 20 to 30%.<br>(6) Stir the spray again to sink<br>The difference is basically the same as step (4), the difference is that the amount of drilling pulp is about 10 to 20%.<br>(7) Stir up again<br>The difference is basically the same as step (5), the difference is to increase the amount of pulp 10 to 15% per month.<br>(8) Shift<br>The blender shifts and repeats steps (3) (4) (5) (6) (7).

The sealing wall of the water stop curtain of the project adopts the technology of biaxial clay mixing pile.<br>Location<br>After the construction site is leveled, the pile position shall be determined according to the plan layout of pile position. Move the mixer to the design pile position,<br>For positioning and alignment, the setting out error of pile position is less than 50 mm, and the allowable deviation of verticality (per meter) of mixing shaft is not more than 15 mm.<br>② Construction sequence<br>The long axis of the double axis of the clay mixing pile is perpendicular to the direction of the sealing wall, and the continuous construction from one end to the other is adopted for the clay mixing pile.<br>3. Pulping<br>The mud pit is set at the boundary of the reinforcement area, which is excavated mechanically, and the bottom is paved with plastic film and geotextile.<br>The permeability coefficient of clay curtain wall is less than 5 * 10-6cm / s, and the mixing ratio of mud is 30% according to the indoor mixing ratio test.<br>After completion, the mud pit shall be treated and filled with medium coarse sand, and all mud in the pit shall be transported to the sealing ditch.<br>④ Mixing and shotcreting sinking<br>Start the motor and mortar pump to make the mixer<br>When the guide frame is agitated and cut into the soil and sinks, the mixed mud shall be pressed into the foundation, and the mud shall be sprayed while rotating, so as to ensure that the mixing sinking and spraying speed are synchronous, and the sinking speed shall not be greater than 1.2 m / min. Generally, the mixing depth is 10-20cm deeper than the design depth. When mixing to the pile end, the bottom shall be set for more than 30 seconds to ensure that the slurry completely reaches the pile end. The amount of drilling grouting is about 50-60%.<br>⑤ Agitation rise<br>When the mixing head sinks to the design depth and sits at the bottom for more than 30 seconds, it starts to lift and spray while rotating, with the lifting speed no more than 0.8 m / min. When the mixing head is lifted to 1 m from the pile top, it shall be slowed down. When the shotcrete mouth is exposed to the ground, the lifting shall be stopped and the mixing shall be carried out for several seconds to ensure that the pile head is uniform and dense. The grouting amount is about 20-30%.<br>⑥ Mix again and spray to sink<br>It is basically the same as step ④, the difference is that the amount of drilling grouting is about 10-20%.<br>⑦ Stir again to rise<br>It is basically the same as step ⑤, the difference is to increase the grouting amount by 10-15% per month.<br>Transposition<br>Move the mixer and repeat step ③ ④ ⑤⑥⑦.<br>