本文關(guān)鍵詞：北海沙壩沉積地層場地建筑物地基的巖土工程分析評價(jià)　出處：《中國海洋大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 沙壩沉積地層 地基 巖土工程 分析 評價(jià)

【摘要】：隨著社會經(jīng)濟(jì)的增長,沿海工程建設(shè)向海岸帶發(fā)展。北海三面環(huán)海,陸域土地空問發(fā)展有限,工程建設(shè)向海岸帶(北部海岸、南部海岸、外沙島)發(fā)展。外沙島位于北海市北岸,四面環(huán)海,呈帶狀,是中全新世海侵在下更統(tǒng)湛江組(Q,Z)地層上沉積形成的海相沉積沙壩,晚全新世海岸抬升形成了一級海積階地,沙壩與海岸間形成了瀉湖沉積。 外沙島沙壩的基底為下志留統(tǒng)靈山群第二組的砂巖,基底巖石埋置深度80～100m,從下至上覆有第三系南康組(Nn)上部為粘土,中部以砂礫石和粗砂為主,下部以粘土為主夾有砂礫層、第四系下更新統(tǒng)湛江組(Q1z)砂礫層、第四系中全新統(tǒng)(Q4)松散層。 外沙島沙壩處于北海市地下水系統(tǒng)的排泄區(qū)(帶),地下水由南向北徑流,排于海域之中。場地地下水分潛水及承壓水兩種類型。場地潛水主要接受海水滲透補(bǔ)給及降水補(bǔ)給,承壓水通過巖性天窗接受潛水的越流補(bǔ)給及陸域的排泄補(bǔ)給,承壓水之間有水力聯(lián)系,且水位亦受潮汐效應(yīng)影響。潛水為咸水,明顯受到海水入侵混合影響。 通過鉆探取樣、標(biāo)準(zhǔn)貫入試驗(yàn)、圓錐動力觸探試驗(yàn)、土工試驗(yàn)等巖土工程測試技術(shù),獲得各個(gè)土層的物理力學(xué)性質(zhì),運(yùn)用土力學(xué)、工程巖土學(xué)、水文地質(zhì)學(xué)等研究方法,在定性分析的基礎(chǔ)上進(jìn)行定量分析,作出各巖土層的巖土性質(zhì)評價(jià)。 分析基礎(chǔ)方案,結(jié)合地下室功能、結(jié)構(gòu)及防滲要求,認(rèn)為樁筏聯(lián)合基礎(chǔ)是比較適宜該場地的基礎(chǔ)形式,以④層土為樁端持力層。樁基及筏板均要做防滲、防腐措施。 分析基坑工程方案,通過定性分析選出支護(hù)結(jié)構(gòu)的類型及計(jì)算其嵌入深度；通過滲透變形分析計(jì)算及涌水量計(jì)算,確定懸掛式止水帷幕的嵌入深度及降水方式為坑內(nèi)降水。提出修建擋浪墻及在基坑與海之間采用隔水帷幕減少海浪及海水側(cè)向滲透力的影響。 北海外沙島沙壩沉積地層場地建筑物地基的巖土工程條件有其地域的特殊復(fù)雜性：上部第四系海相沉積砂層較松散,力學(xué)性質(zhì)差,在地震作用下飽和砂土有液化的可能,湛江組頂部粘土隔水層受剝蝕缺失,使第四系海相沉積松散砂層的潛水含水層與湛江組礫(粗)砂的Ⅰ承壓含水層相通,造成上部含水層超過30m,地下水位接近地面,地下水與海水有密切的水力聯(lián)系。另外,外沙島沙壩場地受潮汐、海浪、風(fēng)暴潮、海水等海洋水文環(huán)境條件的影響,建筑地基基礎(chǔ)施工需要考慮潮汐、海浪、風(fēng)暴潮、海水側(cè)向滲透力的影響。 本課題通過外沙島沙壩場地建筑地基的巖土工程條件分析,研究該場地建筑基礎(chǔ)方案、基坑工程方案及海水與地下水的防治措施。為沙壩沉積地層場地建筑物地基的地基基礎(chǔ)及基坑工程設(shè)計(jì)、施工提供參考。
[Abstract]:Along with the growth of the social economy , the coastal engineering construction is developing to the coastal zone . The North Sea is located on the north bank of the North Sea . The outer sand island is located in the north bank of the North Sea . The outer sand island is located on the north bank of the North Sea . The four sides of the Huanghai Sea are in the form of a strip . The basement of the sand bar on the outer sand island is the sandstone of the second group of the Lingshan Group , the lower Zhiliu Series , the burial depth of the basement rock is 80 ~ 100m , the upper part of the Tertiary Nankang Formation ( Nn ) is the clay , the middle part is mainly composed of sand gravel and coarse sand , the lower part is mainly composed of sand gravel layer and coarse sand , and the lower part is the sandy gravel layer with clay as the main part , and the fourth system is the Holocene ( Q1z ) sand gravel layer , and the Quaternary middle Holocene ( Q4 ) loose layer . The sand bar of the Outer Sand Island is located in the drainage area ( belt ) of the groundwater system in the North Sea . The groundwater flows from the south to the north and is discharged into the sea area . The ground water is divided into two types : sea water infiltration and recharge , and the water level is influenced by the tide effect . The diving is salty water , which is obviously affected by the seawater intrusion . Through drilling sampling , standard penetration test , cone dynamic penetration test , geotechnical test and other geotechnical test techniques , the physical and mechanical properties of each soil layer are obtained . Based on the analysis of foundation scheme , combined with basement function , structure and anti - seepage requirements , it is concluded that the foundation of pile raft foundation is the foundation form suitable for the site , and the pile foundation and raft board should be anti - seepage and anti - corrosion measures . Based on the analysis of seepage deformation and the calculation of water inflow , it is determined that the embedded depth and the precipitation method of the suspended water - stop curtain are in the pit . The influence of the water - proof curtain on the lateral seepage of sea wave and seawater is proposed by using the water - proof curtain between the foundation pit and the sea . The soil engineering conditions of the building foundation in the sand dam sedimentary formation in the sand island of the North China Sea have the special complexity of the area : the upper Quaternary marine sedimentary sand layer is loose , the mechanical property is poor , and the saturated sand in the upper part of the Zhanjiang Formation is affected by the erosion , so that the water - bearing layer of the Quaternary marine sedimentary loose sand layer is affected by the conditions of marine hydrological environment such as tide , sea wave , storm tide and sea water , and the construction foundation construction needs to take into account the influence of tide , sea wave , storm tide and seawater lateral seepage force . Based on the analysis of the geotechnical conditions of the building foundation of the sand dam site in the outer sand island , the paper studies the construction foundation scheme , the foundation pit engineering scheme and the prevention and control measures of the sea water and groundwater , and provides a reference for the foundation of the foundation of the building foundation and the engineering design and construction of the foundation pit .

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU470

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