普洱文庭雅苑地基处理水泥土搅拌加芯桩法探究
2020-05-21赵学
赵学


摘 要:普洱文庭雅苑场地中上部地基土中,无稳定统一的天然地基持力层可供选择。用下部第⑥层中等风化砂岩做建筑物桩(钻孔灌注桩)基础持力层的地基基础方案可行,但基础造价偏高,较不经济。建筑物适宜采用处理地基钢筋混凝土十字交叉条形基础方案。根据建筑物结构类型、荷载大小及使用要求,结合场地地形地貌、地层结构、土质条件、地下水特征、周边环境条件、各地基处理方法的适用条件和对邻近建筑物的影响等因素,进行综合分析比选,场地选择加固途径中的水泥土搅拌加芯桩地基处理方法较优。
关键词:地基处理;固结途径;加固途径;水泥土;搅拌桩
中图分类号:TD12 文献标志码:A 文章编号:2095-2945(2020)15-0117-02
Abstract: In the middle and upper foundation soil of Wenting YayuanGardenin Pu'er, there is no stable and unified natural foundation bearing layer to choose from. It is feasible to use the moderately weathered sandstone in the sixth layer of the lower layer as the bearing layer of the building pile (bored cast-in-place pile) foundation, but the foundation cost is high and uneconomical. It is suitable for the building to adopt the scheme of reinforced concrete cross strip foundation to deal with the foundation. According to the building structure type, load size and use requirements, combined with the site topography and geomorphology, stratum structure, soil conditions, groundwater characteristics, surrounding environmental conditions, the applicable conditions of various foundation treatment methods and the impact on adjacent buildings and other factors, a comprehensive analysis and comparison is carried out, and the cement-soil mixing core pile foundation treatment method is better in the site reinforcement way.
Keywords: foundation treatment; consolidation approach; reinforcement approach; cement-soil; mixing pile
1 工程簡介
普洱文庭雅苑位于云南省普洱市南屏镇普洱学院南面,交通方便,建筑物场地北面为空地、南临旅游环线、西接市政道路、东临市政道路,施工环境条件一般,总用地面积13274.01m2(合19.91亩),场地内拟建1#、2#、3#、4#、5#、6#框架结构商住楼,属一般民用建筑物,现状规则,状如矩形,总体按四合院格局规划布设,工程概况详见表1。场地内无故河道、暗浜、土洞、墓穴等不利埋藏物,周边亦无滑坡、崩塌、泥石流等不良地质作用。
2 岩土工程特性
场地属河流侵蚀堆积地貌,地势开阔,地形相对平坦,地面标高1327.99~1325.59m,高差2.40m。地层结构由第①层素填土(松散)、第②层黏土(可塑)、第③层黏土(软塑)、第④层粉土(密实,不液化)、第⑤层粉质黏土(基岩风化残积土)、第⑥层中等风化砂岩组成,覆盖层厚度3~50m,场地等效剪切波速Vse=194.31m/s,地基土属中软土类型,场地类别为Ⅱ类,地基土在平面分布上成因、岩性、状态不均匀,区域历史地震频繁,场地属抗震不利地段。……
