项目一期土地平整土方平衡调配及施工方案1目录第一章项目背景·································································································2第一节编制依据······························································································2第二节区位解读······························································································2第二章现状分析·································································································2第一节自然环境································································································2第二节现状建设情况························································································6第三节现状交通······························································································7第三章项目一期土地平整····················································································7第一节一期概述······························································································7第二节工程量及土方调配·················································································8第四章土方施工·······························································································13第一节技术指标····························································································13第二节项目机构····························································································15第三节施工测量·····························································································15第四节施工部署及施工方法···············································································16第五节雨冬季施工及安全·················································································21第五章文明施工措施························································································24第一节现场总平面管理····················································································24第二节环境保护措施·······················································································24附图1:3000KN/m强夯布点图。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。26附图2:边坡放坡处理图。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。27工程预算…………………………………………………………………………………………28项目一期土地平整土方平衡调配及施工方案2项目一期土地平整土方平衡调配及施工方案第一章项目背景第一节编制依据项目修建性详细规划说明书第二节区位解读一、地理区位二、交通区位第二章现状分析第一节自然环境一、地形地貌本片地处黄河北岸高阶地区域,由于长期受地表水流强烈侵蚀切割,阶地地貌形态除局部存在有残留的高阶地平台及冲积二元结构外,其实已演变为黄土丘陵地貌的一部分。地形特点是梁峁平缓,沟间宽浅、沟坡陡峻、相对高差不大,多在百米以内。沟道进入南部黄河入口处,地貌以阶地为主,侵蚀沟道切割较深,多已基岩外露,将阶地分割成互不相连的板块,并不断侵蚀蚕食。本区总的地势北高南低,现状用地高程范围在1513.36-1790.68米之间,最大高差277.32项目一期土地平整土方平衡调配及施工方案3米。土壤母质全系第四纪黄土,土层深厚,多在数十米之间,易于开发利用。土壤以黄绵土为主,也有灰钙土分布,ph值8.2微碱性反应。有机质含量较低,一般不足1﹪,速效磷17ppm,速效钾106ppm,全氮含量0.76‰缺氮少磷钾较富,肥力不足。土壤通透性能好,发苗快、后劲不足、遇水易湿陷,给灌溉造成一定困难。项目南部(一期)为黄土台地区,区内主要的建筑设施、果园地、耕地位于该区,地势低缓总体向南倾斜,坡度5-10度左右,地形多呈台阶状,相对平坦。项目北部(二期)为黄土梁峁区,海拔1600-1720m,黄土堆积厚度30-50m(黄土之下有厚3-10m的砾卵石),该区不宜规划可能导致高切坡、深开挖的建设项目。现状用地中坡度在8度以下的可建设区域约170万平方米,占总用地的29%,其余用地均需进行大力改造方可进行建设;用地中阳坡、半阳坡约占总用地的64%,日照条件优。二、气象水文为大陆性温带半干旱气候区,总的特征是气候干燥,降水少、蒸发强烈、温差大、日照时数长等。根据象站多年资料统计,该地区光照资源充足,日照百分率59.48﹪。年日照2607小时,年辐射129.74千卡∕平方厘米,年平均气温9.1℃,≥10℃活动积温2389℃,昼夜温差大,平均日较差12.9℃,平均无霜期177天。,极端最高和最低气温分别为39.1℃和-23.1℃;多年平均降雨量316.7mm,最大为546.7mm(1978年),最小为189.2mm(1980年);年平均蒸发量1438项目一期土地平整土方平衡调配及施工方案4毫米,干旱指数为4.4。项目区河流均属黄河支流水系,无常年性地表径流沟谷,主要沟谷河流有黄河一级支流大浪沟和二级支流石沟。以上两沟谷发育于黄河北黄土丘陵区,属季节性流水沟谷,沟谷来水量受降水量多寡的控制,一般在夏、秋季节遇强降水和连续降水时,沟内有洪流出现,并于泥石流相伴。大浪沟发源于皋兰县什川乡杨洼掌疙瘩,自北而南流经评估区东侧,在青白石一带汇入黄河。石沟是小砂沟的支沟,发源于城关区青白石乡石沟村。三、工程地质项目区地处中川隐伏基底隆起带和皋兰褶皱带的结合部位,周边地质构造较为复杂,但区内地质构造不发育;区内岩土体工程地质性质不良;地貌类型为黄土丘陵地貌,细划分为黄土丘陵梁峁、阶状台地两个亚类种,人类工程活动对地质环境的影响程度强烈,地质环境条件复杂。现状发育的地质灾害主要有滑坡、崩塌、不稳定斜坡、泥石流、采空区及黄土湿陷。土地整平方式为挖山填沟,既挖除控制高程以上的山体,回填至控制高程以下的沟谷中,控制高程以上的山体主要岩性为黄土、砂岩等,由于岩性的差异,其开挖方式或回填方法也不尽相同。黄土及松散的砂砾岩采用挖掘机配合自卸汽车挖运,填方区机械整平和压实的方法经行施工;结块的砂砾岩采用爆破松动,挖掘机配合自卸汽车挖运至填方区用强夯加固的形式进行施工,规划区基岩岩性一般为砂岩,透水性较差;对于基岩无论采用何种方法挖掘,必须有效控制填项目一期土地平整土方平衡调配及施工方案5料粒径,以减少颗粒之间的孔隙,防止地面沉降。在回填过程中,无论采用何种填料,都应保证回填密实,以提高地基的承载力。项目区大小沟谷数条,较大型的沟谷有大浪沟、石沟等,是地表洪水和地下径流的主要排泄通道;石沟年平均径流量19.4×104m3。五十年一遇最大洪峰流量92.7m3/s。一百年一遇最大洪峰流量113.6m3/s。在填挖过程中,应保证其地表水及洪水的排泄,如被堵塞后,可能会造成严重的后果,且包兰铁路从中通过,填挖方不可能使包兰铁路改线,这样势必在铁路两侧形面高边坡,施工过程中还应考虑边坡的稳定性问题。中、小型的沟道开挖回填最好从分水岭开始,依次向下游推进,否则在其回填过程中,地表洪水排泄不畅,地表水下渗,会使沟道内地下水富集,产生液化震陷或地基不均匀沉降。项目区出露的地层主要由第四系粉土、黄土、卵石、古近系砂岩。规划区大部分地基土为盐渍土。粉土及马兰黄土层为湿陷性土,湿陷等级为Ⅳ级(很严重),湿陷深度大于21米。项目区地基土的平均最大干密度为1.695g/cm3,最优含水量为16.55%。项目区内地下水类型分为碎屑岩类孔隙裂隙水和松散岩类孔隙水。由于现沟谷地下水位埋深与开挖标高相差很大,因此对项目区工程建设影响较小。项目区内现存在滑坡、崩塌、泥石流、采空区黄土湿陷等地质灾害,滑坡、崩塌经开挖回填后将对工程建设没有影响;在沟谷的回填过程中可能会引发或加剧泥石流易发性,施工过程中应采取一定的措施,防止泥石流等灾害的发生;采空区位于黄土层以下,在地基的回项目一期土地平整土方平衡调配及施工方案6填过程中应加以处理,否则会给今后的工程建设带来一定的影响。本工程地质资料部分来源于《坪规划园区工程地质勘察报告》,该报告也指出本次调查方法简单,调查精度有限,建议在土地平整后,进行工程设计的地质勘察工作。四、生态环境该流域天然植被属荒漠草原,以旱生草本和小灌木为主,分布有阿盖蒿,短花针芽、女蒿、红砂、野枸杞、白刺、冰草、骆驼蓬、菌陈蒿等。覆盖度很低,一般阳坡上仅有15﹪左右,阴坡在30﹪上下。现状用地中人工植被面积较少,植物群落相对单一。南部坪地区域的现状植被主要以苹果、梨、桃等果树为主,在村庄周边零星分布有一些菜园和耕地,北部山体区域则主要以人工草地为主和极少的由人工种植的刺槐所形成的疏林。部分地区不合理的取土采石、开挖坡脚等破坏植被的人类活动也较为严重。第二节现状建设情况项目范围用地内村落建筑主要以当地特色的四合院为单元体,按自然聚落呈聚集分布,建筑结构以砖混结构为主,平均层数1.5层,零星分布有些简单的构筑物及已损毁建筑,无保留价值。总拆迁量约为11.5万平方米,安置面积小。用地内有两处220KV高压输电线从中穿过,配电线的架设较为混乱,存在安全隐患;人口较为集中的村落,现有的通讯设施基本可以满足需求,但设施相对简陋。项目一期土地平整土方平衡调配及施工方案7第三节现状交通一、对外交通本片区对外交通基础较薄弱,使得青白石孤立于几大城市板块之外。现有道路主要有:柳忠高速公路——现状道路路基宽24.5米,双向4车道,路面状况较好。向北直达中川机场。盐什公路——现状道路况较较差,是项目区与城区联系的通道。二