地質(zhì)資料翻譯-中英對(duì)照
3.特殊地質(zhì)體的空間分布
田灣核電站擴(kuò)建工程特殊地質(zhì)體在田灣核電站施工之前的地表地質(zhì)工作中未能發(fā)現(xiàn)。廠址附近1：5萬地質(zhì)填圖、田灣核電站可行性研究階段1：2000工程地質(zhì)測(cè)繪和田核一期工程的1：1000工程地質(zhì)測(cè)繪，在地表均未發(fā)現(xiàn)該地質(zhì)體的蹤跡，1978年拍攝的大比例尺航片上也沒有影像直接顯示。由于田灣核電站進(jìn)行的土石方開挖，特殊地質(zhì)體得以出露到現(xiàn)地面。
3.1特殊地質(zhì)體的平面展布
3.1.1在3＃核島場(chǎng)地內(nèi)的展布
擴(kuò)建工程詳勘工作中，203、214、220、220-1和220-2等5個(gè)鉆孔發(fā)現(xiàn)了破碎帶，這5個(gè)鉆孔基本在一條直線上（圖3-1），呈NW-SE走向。在先期開挖的3＃核島東側(cè)減震溝中也發(fā)現(xiàn)了構(gòu)造破碎帶（照片3-1），破碎帶亦呈NW-SE走向，并且上述5個(gè)鉆孔連線的延長線通過減震溝的破碎帶位置。顯然鉆孔和減震溝所發(fā)現(xiàn)的破碎帶屬特殊地質(zhì)體。鉆孔揭露的特殊地質(zhì)體深度超過56m。
為了查明特殊地質(zhì)體在場(chǎng)地內(nèi)的分布，2003年，核工業(yè)工程勘察院在地面共布置了5條探槽和5條電阻率剖面測(cè)線（見圖3-1），探槽和電阻率剖面大致垂直于上述5個(gè)鉆孔的連線，間距30m左右，探槽的長度以能覆蓋特殊地質(zhì)體為準(zhǔn)，電阻率剖面長度以能覆蓋特殊地質(zhì)體，并在其兩側(cè)有足夠長度的正常場(chǎng)為準(zhǔn)。由于當(dāng)時(shí)場(chǎng)地內(nèi)堆放了大量的石料，探槽和電阻率剖面的位置作了適當(dāng)調(diào)整，電阻率剖面P3～P4測(cè)線之間為60m，203鉆孔西側(cè)沒有布置探槽和電阻率剖面。3＃核島基坑開挖至-0.8m后，又對(duì)基坑坑壁和坑底進(jìn)行了編錄。
2008年，核工業(yè)工程勘察院又在3＃、4＃核島之間開挖了3條探槽（見圖3-1），以查明3＃、4＃核島場(chǎng)地內(nèi)特殊地質(zhì)體的關(guān)系。
通過上述調(diào)查發(fā)現(xiàn)3＃核島場(chǎng)地和3＃、4＃核島之間分布有2條特殊地質(zhì)體。其中大的一條特殊地質(zhì)體在3＃核島場(chǎng)地內(nèi)的展布長度175m左右，揭露寬度7.0～14.0m，方向330°左右（見圖3-1），向北西尖滅于固體廢物暫存庫（9UKT）場(chǎng)地西北部，各電阻率剖面上均有一個(gè)寬度為12.0～16.0m的明顯低阻段，其位置與探槽發(fā)現(xiàn)的該特殊地質(zhì)體位置基本重合；較小的一條特殊地質(zhì)體位于固體廢物暫存庫9UKT西北，展布于3＃、4＃核島之間，長約40m，最大寬度約5m，呈明顯的透鏡體裝，方向330°左右（見圖3-1）。
從3＃核島基坑坑底來看，特殊地質(zhì)體是連續(xù)分布的，從基坑?xùn)|南角到西北角斜穿安全廠房（UKD）地基（圖3-2），總體走向?yàn)镹W335°左右，長度近70m，寬度約3.5～15m，與探槽揭露、電阻率剖面探測(cè)的結(jié)果基本一致。
在一期工程2＃機(jī)組的循環(huán)冷卻水隧洞（UPN）、核服務(wù)廠房基坑（UKC）和常規(guī)島基坑（循環(huán)冷卻水泵房UQA和汽輪機(jī)廠房UMA）編錄中發(fā)現(xiàn)了深層強(qiáng)風(fēng)化巖體，這些強(qiáng)風(fēng)化巖體均呈NW～SE走向，陡傾角，帶內(nèi)巖體破碎，與圍巖的接觸帶上有白色或紅色的粘土礦物呈條帶分布，空間上處在3＃核島特殊地質(zhì)體向南東的延長線上（圖3-3），這些深層強(qiáng)風(fēng)化巖體可能是3＃核島特殊地質(zhì)體向南東方向的延伸。
在編錄中發(fā)現(xiàn)，與2#循環(huán)水隧洞及核服務(wù)廠房基底所見深層強(qiáng)風(fēng)化帶相比較，常規(guī)島段巖體破碎程度較輕，并且見深層強(qiáng)風(fēng)化巖體在汽輪機(jī)廠房基坑中部尖滅，基坑?xùn)|壁上未發(fā)現(xiàn)深層強(qiáng)風(fēng)化巖體（圖3-4）。
為了查明廠址附近海域基巖面埋深、形態(tài)及海域斷裂情況，尤其是查明燒香河斷裂在海域的延伸情況，江蘇省工程物理勘察院在廠址附近海域做過人工地震勘察，測(cè)線布置見圖3-5。如果特殊地質(zhì)體向南延伸的話，這次海域人工地震勘察的測(cè)31和測(cè)2線相應(yīng)位置應(yīng)該有異常顯示，但這兩條測(cè)線時(shí)間剖面（圖3-6、圖3-7）上的T5波組（基巖面反射波組）穩(wěn)定、清晰、連續(xù)而平坦，其它波組同樣是穩(wěn)定和連續(xù)的，沒有受到斷層錯(cuò)動(dòng)的影響均未發(fā)現(xiàn)異常。
根據(jù)以上兩點(diǎn)判斷，3＃核島特殊地質(zhì)體在2＃汽輪機(jī)廠房基坑中部已尖滅，未向東南方向延伸。
3. Spatial Distribution of Special Geologic Bodies
Special geologic bodies in extension project of Tianwan Nuclear Power Station haven't been found in surface geological work before construction of Tianwan Nuclear Power Station. The special geologic bodies are not found as well in area nearby the station site in 1:50000 geological map, 1:2000 engineering geological map for the feasibility study of the Tianwan nuclear power station and 1:1000 engineering geological map for the first-stage project of the power station, even the larger scale air photos taken in 1978 doesn't directly show its images. Due to the ongoing earthwork stone excavation of Tianwan Nuclear Power Station, the special geologic bodies were exposed out of the current ground.
3.1 Plane Distribution of Special Geologic Bodies
3.1.1 Distribution within 3＃ nuclear island site
During the detail survey of extension engineering, fracture zones were found in the five drills, including 203, 214, 220, 220-1 and 220-2, above of which were distributed in a straight line, (see Fig.3-1), running along the direction of NW-SE. The structure fracture zone (see Picture 3-1) was also found in the damping ditch which was excavated at the early stage in the east of 3＃ nuclear island, this fracture zone also runs along the direction of NW-SE, in addition, the extension line of the above five drills passes through position of the fracture zone in the damping ditch. Evidently, the fracture zone existed in the drills and damping ditches could be classified into the geologic bodies. The depth of geologic bodies disclosed by the drills is about 56m.
In order to find out the distribution in the area, the Nuclear Industry Engineering Reconnaissance Institution deployed 5 trial trenches and 5 resistivity profile measuring wire on the ground in 2003 ( Figure 3-1), the trial trenches and profile are vertical to the ligature of the 5 drill holes, and the separation distance is about 30m. The length of the trial trench can cover the special geological body. The length of the resistivity profile can cover the special geological body and it has normal field long enough in the two sides. Since a plentiful of stone is stacked in the site, the positions of trenches and resistivity profile have been adjusted properly, distance between P3～P4 of resistivity profile is 60m, and no trench and resistivity profile were arranged in the west of 203 drill. After the foundation pit of 3# nuclear island is excavated to depth of -0.8m, the walls and bottom of foundation pit were cataloged again.
In 2008, the Nuclear Industry Engineering Survey Institute excavated 3 trial trenches between No.3 and No.4 nuclear island (Figure 3-1) to find out the relationship of the special geological bodies in the area of No.3 and No.4 nuclear islands.
Through the investigation above, 2 geological bodies are found in No.3 nuclear island and the space between No.3 and No.4 nuclear islands. The larger one is about 175m in length in No.3 nuclear island, the exposure width is about 7.0m to 14.0m, and the direction is about 330° (Figure 3-1). It ends at the solid waste temporary storage place (9UKT) in the northwest. There is a part of low resistance with the width of 12.0 to 16.0m in each resistivity profile, and its position is almost the same with the special geological bodies found in the trial trenches. And the smaller special geological body is located at northwest of the waste temporary storage place (9UKT), between No.3 and No.4 nuclear island, it is about 40m in length and the max width is about 5m. It presents to be lenticular form, and the direction is about 330° (Figure 3-1).
Seen from the base of the foundation pit, the special geological body is continuous distribution. It goes from southeast corner to the northwest corner to cross the base of the save plant (UKD) (Figure 3-2), the overall direction is about NW335°, and the length is nearly 70m, the width is 3.5 to 15m. It is coincident with the detecting result of the trial trenches and resistivity profile.
1. In the catalog of circulating cooling water tunnel of No.2 generating unit (UPN), the foundation pit of nuclear service plant (UKC) and foundation pit of CI (conventional island)(circulating cooling water pump house (UQA) and steam turbine house (UMA)) of Phase I project, deep strongly weathered rock mass was found. These strongly weathered rocks are all in NW-SE direction, with steep dip; the rock mass were broken within the zone, and there were white or red clay minerals in the contact belt with the surrounding rocks distributed in stripes. These rock mass are in the southeastward extension line of the special geologic body on No.3 NI (Fig.3-3). These deep strongly weathered rock mass is probably the southeastward extension of special geologic body of No.3 NI.
1. It is found in the catalog that, compared with the deep strongly weathered belt found in No.2 circulating cooling water tunnel and foundation bottom of nuclear service building, the fracture degree of rock mass in CI section is relatively low, and it is seen that the deep strongly weathered rock mass pinched out in the center of foundation pit of steam turbine house; no deep strongly weathered rock mass is found in the east wall of foundation pit (Fig.3-4).
1. In order to find out the buried depth and shape of offshore bedrock near the plant site and offshore fractures, esp. the extension of Shaoxianghe Fracture in offshore area, the Jiangsu Engineering Physical Survey Institute conducted seismic survey in offshore area near the plant site. See survey lines in Fig.3-5.1. If the special geologic body extended to the south, then the survey lines of 31 and 2 of this offshore seismic survey should show abnormal indications in their respective locations, but the T5 wave groups on time profile of these two survey lines (Fig.3-6 and 3-7) are stable, clear, continuous and plat; the other wave groups are also stable and continuous, not affected by faulting.
1. So judged by the above two points, the special geologic body of No.3 NI has pinched out at the middle of foundation pit of No.2 Steam turbine house, not extending to the southeast.
2012.10.21