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针对一种新型围桩-土耦合式抗滑结构,建立室内模型试验,采用应力、应变等测试手段,研究结构的加固滑坡工作机制.结果表明:黏性土介质为主滑坡体中,采用4倍围桩桩径作为围桩间距,呈正六边形布置,桩顶圈梁连接构成耦合结构,锚固深度为桩长的2/5时,在滑坡推力作用下,结构整体能够发挥较好的耦合效应,即桩土形成复合体,各围桩桩后的滑坡推力在滑面以上呈抛物线分布,在滑面以上约桩长10%附近出现最大值,滑面以下呈倒三角形分布,各围桩桩前的滑床抗力在滑面以上呈倒三角形分布,且在桩顶处出现最大值,在滑面以下呈正三角形分布,在滑动面处为最小值;各围桩的桩身最大弯矩位于滑动面以上10%桩长处,滑动面上、下圴呈抛物线分布;滑体中的土压力沿滑动方向不断减小,在桩位处土压力基本不变.其研究成果为建立这种新型抗滑结构的设计理论提供依据.
Aiming at a new type of pile-soil coupling anti-skid structure, an indoor model test was established, and the working mechanism of the reinforced landslide was studied by means of stress and strain test.The results show that: As the spacing of the surrounding piles, the diameter of the piles is taken as a regular hexagon arrangement, and the coupling of the top ring beam and the piles forms the coupling structure. When the anchorage depth is 2/5 of the pile length, the structure can exert better coupling under the action of landslide thrust Effect, that is, pile-soil formation complex. The landslide thrust behind each gob-end pile has a parabola distribution above the slip surface, with maximum value around 10% of the pile length above the slip surface and inverted triangle distribution below the slip surface. The resistance of the sliding bed in front of the pile is inverted triangle distribution above the sliding surface, and appears at the top of the pile. The maximum appears in the triangle below the sliding surface and the minimum in the sliding surface. The maximum bending moment of each pile lies in The length of 10% of the pile above the sliding surface shows a parabola distribution on the sliding surface and on the lower surface of the sliding surface. The earth pressure in the sliding body decreases along the sliding direction, and the earth pressure at the pile site is basically unchanged. Slip structure design theory to provide the basis.