【文章內(nèi)容簡介】 ty, its construction ability is high. All the above layers are not consecutive, and widely vary in thickness.（43）層很密的粉細(xì)砂層亦具良好的建筑特性，但埋藏較深。Layer （43）fine silt in high density has very good construction ability, but buried deeply.（51）層粉質(zhì)粘土呈流塑狀態(tài)，具高壓縮性、承載力低的工程特性，其建筑性能差；7 / 90Layer （51）silty clay show fluid condition, it is in the characteristics of high pressibility and low bearing capability, its construction ability is poor.（52）層粉質(zhì)粘土呈軟塑狀態(tài)，具較高壓縮性、承載力低的工程特性，其建筑性能較差；Layer （52）silty clay shows soft plastic condition, it is in the characteristics of high pressibility and low bearing capacity, its construction ability is poor（53）層粉質(zhì)粘土呈可塑狀態(tài)，建筑性能中等；Layer （53）Silty clay shows ductile, its construction ability is medium（54）層粉質(zhì)粘土呈硬塑狀態(tài)，建筑性能較好，但此兩層埋藏較深。Layer （54）Silty clay shows hard plastic condition, its construction ability is good, but this two layers are buried in deeper depth.（61）層強(qiáng)風(fēng)化泥質(zhì)粉細(xì)砂巖及(62）層中等風(fēng)化泥質(zhì)粉細(xì)砂巖的建筑性能良好，但埋藏較深。Layer （61）The construction ability of the strongly weathering clay fine silt rock (62） and medium weathering clay fine silt rock are very good, but buried in deep depth.下伏基巖為淺灰、灰白色泥質(zhì)粉細(xì)砂巖，普遍間夾薄層淺褐色砂質(zhì)泥巖。根據(jù)其風(fēng)化程度，將下伏基巖劃分為（61）層強(qiáng)風(fēng)化層和（62）層中等風(fēng)化層。 （61）層多被風(fēng)化成砂狀，鉆孔中很難取出較完整的巖芯，一般層厚；（62）層巖性相對較完整，巖芯多以短柱狀為主，層厚較大，未揭穿。Buried foundation rock is french gray or clay fine silt offwhite, usually contains thin layer of sandy clay rock. According to the status of weathering, the buried foundation rock is divided into strongly weathered layer（61） and medium weathered layer(62）. 8 / 90Layers （61 ）are mostly weathered into sandy condition, it is hard to take out a plete rock core, normally layer thickness is 。 layer (62）has relatively plete lithology, its rock cores are mostly shortcolumn shape, thickness is big, 擬建場地內(nèi)分布的(31)、 （32 ）層粉細(xì)砂在 7 度地震力的作用下有產(chǎn)生液化的可能，可液化層主要分布在擬建主廠房和海上引水管部分地段（地內(nèi)分布的（21）淤泥質(zhì)粉質(zhì)粘土及（51）層粉質(zhì)粘土承載力特征值小于 80kPa。The fine silt layers (31)amp。（32）distributed in the planed site is probabaly to liquidize under the action of seismic force of Grade 7, the liquidizing layers mainly distributes in the sections of the planed main workshop and onsea water introducing pipe, characteristic value of mucky silty clay (21)and silty clay （51）is smaller than 80kPa 由于擬建場地上部地基土層較軟弱，地下水埋藏較淺，基坑開挖時，由（21）層構(gòu)成的坑壁段易產(chǎn)生坍塌， （31）層、 （32）層易演變成流砂，故需要采取適當(dāng)?shù)目颖谥ёo(hù)措施，同時采取適當(dāng)?shù)幕咏邓胧s the upper earth of the planed site’s foundation is soft, the underwater is buried in a shallow depth, when foundation pit is excavated, the pit wall section consisted of the layer（21）is easy to collapse, Layer (31) amp。 (32) is easy to change into drifting sand, so proper supporting measure is necessary, meantime, some foundation pit water level lowering should be taken. 循環(huán)水泵房地段 020m 深度范圍內(nèi)分布的地基土層強(qiáng)度較高，初步設(shè)計的泵房基底座落在建筑性能良好的（43）層很密狀的粉細(xì)砂層之上，根據(jù)該地段地基土構(gòu)成及其場地條件，循環(huán)水泵房下部構(gòu)筑物可采用沉井法進(jìn)行施工（由于該地段地下水埋藏較淺，而大開挖所形成的坑壁均為砂層，雖然其密實度較好，但遇水侵泡后仍有可能產(chǎn)生流砂，從而導(dǎo)致坑壁坍塌） ，施工期間應(yīng)采取切實可行的降排水措施，根據(jù)我公司的各類地質(zhì)條件沉井施工經(jīng)驗，本期工程的基坑降水可以采用深井降水和坑內(nèi)排水措施相結(jié)合的方法進(jìn)行施工，嚴(yán)防坑壁9 / 90泡水。The strength of the foundation soil layer distributed within 020m depth range in circulating water pump rooms section, preliminarily designed pumps room base is located on the fine silt in highdense layer (43)with good construction ability, according to the position of foundation soil and site condition, the lower structure of circulating water pumps room can be constructed in the way of sunk well(as the underwater of this section buried in a shallow depth, pit walls produced by big excavation are all sand layer, although it has a good pactness, occasionally soaking by water is still possible to create drifting sand then to collapse), during construction work, appropriate and feasible level lowering and water draining measure should be taken, based on our pany’s construction experience in sunk wells under all classes of geological condition, foundation pit water level lowering of this project can be realized in the bined way of well water level lowering and insidepit water draining to strictly prevent socking of pit wall 、水文條件 hydrological condition、海水標(biāo)高 Sea water elevation最低天文潮位 (LAT)lowest astronomical tide level m平均較低水位 (MLLW)Average low water level m平均海平面 (MSL )Average Seal Level m平均較高的高水位 (MHHW)Average Higher High Water Level m10 / 90最高天文潮位 (HAT) Highest Astronomical Tide Level m、 海水溫度 Sea water temperature最高日平均溫度 : 33 ℃Highest average daily temperature最低日平均溫度 : 25 ℃Lowest average daily temperature日平均溫度 : ℃Average daily temperature設(shè)計冷卻水溫取 31℃，最高水溫 34 ℃。Designed cooling water temperature 31℃Highest water temperature 34 ℃、電站地面 Power station ground電站地面標(biāo)高如下: Elevation of Power station ground:平均海水標(biāo)高 (MWL ) : = EL +Average seawater elevation電廠地面標(biāo)高（PGL） : = EL + Elevation of plant ground、地下水 Underwater 擬建場地大部分取水孔內(nèi)地下水對混凝土結(jié)構(gòu)具弱腐蝕性，僅一個取水孔內(nèi)地下水對混凝土結(jié)構(gòu)無腐蝕性，故建議按弱腐蝕性考慮。場地地下水對混凝土結(jié)構(gòu)中的鋼筋無腐蝕性，對鋼結(jié)構(gòu)具有弱腐蝕性；海水對混凝土結(jié)構(gòu)、對混凝土結(jié)構(gòu)中的鋼筋及鋼結(jié)構(gòu)均具有中等腐蝕性。The underwater in most intake holes in the planed site are corrosive to concrete structure, only one intake hole are exceptional, so we suggest to consider it as light corrosion。 seawater has a medium corrosion to both the steel bars in concrete structure and to steel 11 / 90structure. 擬建場地同一孔中地下水位的大部分變幅不大，個別孔中的地下水位變幅較大，估計是受大氣降水影響所致。而在平面上各個孔中的地下水位埋藏深度存在著一定差異，最淺 (見于附屬建筑物地段地勘資料 )，最深 (見于循環(huán)水管地段地勘資料)。Mostly, the underwater level in the same hole in the planed site varies no much, only a few holes are exceptional, probably due to precipitation. On plane, the underwater level of all the holes are various in burying depth, the shallowest (see geological survey document of accessory buildings section), the deepest (see geological survey document of circulating water pipe section ). 、氣候條件 Climatic condition電站地處海邊的熱帶區(qū)域，氣候炎熱，空氣潮濕、含鹽霧。The power station is located in seaside